Data 3-2

Final Report by Commercial Refrigerator andShowcase, etc. Evaluation Standards
Subcommittee, Energy Efficiency Standards
Subcommittee of the Advisory Committee for
Natural Resources and Energy[Commercial Refrigerators, etc.] (Draft)

January 24, 2011

The commercial refrigerator and showcase, etc. evaluation subcommittee haddeliberations on the standards of judgment for the manufacturers or importers (hereinafterreferred to as “manufacturers”) concerning performance improvement of commercial
refrigerators, commercial refrigerator-freezers, commercial freezers, etc. (hereinafterreferred to as “commercial refrigerators, etc.”) and prepared an interim summary report asfollows.
I. Commercial Refrigerators, etc.
1. Target Scope [See Attachment 1]
The commercial refrigerators, etc. as the target scope of this review shall be the electric
refrigerators, etc. stipulated by JIS B 8630 as the application scope of Commercial
refrigerators and freezers - Characteristics and test methods (limited to those which
include one or more of HFC-125, HFC-143a and/or HFC-134a in their refrigerant),
excluding “type I chilled air forced circulation refrigerators (chilled air forced circulation
refrigerators the rated storage temperature’s lower limit of which is 0°C or above)”, “chilled
air natural convection refrigerator-freezers” and “type I chilled air forced circulation
refrigerator-freezers (chilled air forced circulation refrigerator-freezers whose chiller’s lower
limit for the rated storage temperature is 0°C or above)”). However, those whose storage
chamber’s height is 650 mm or lower and which are horizontal type, those which are watercooling type, those which have double sided doors, vertical freezers, those which arechilled air natural convection type, those which have a drawer of slide rail type, those which
are vertical type whose height is 2,050 mm or higher, those which are exclusively for cold
storage of milk, those which are horizontal type equipped with an electro-magnetic cooker
and those which are modified or specially ordered are excluded from the application scope.
2. Items to be judgment standards for manufacturers(1) Target fiscal year [See Attachment 2]
The target fiscal year for the commercial refrigerators, etc. shall be the fiscal year
2016.
(2) Target standard values [See Attachment 3 to 4]
With regard to commercial refrigerators, etc. that manufacturers ship within Japanfor the target fiscal year, a weighted average of the annual energy consumption(kWh/year) calculated in (3), by the volume of shipments for each manufacturer per
category in the table below shall not exceed the target standard value.
Table 1 Standard Energy Consumption Efficiency for Commercial Refrigerators andRefrigerator-freezers
Category

Type ofRefrigerator

1A
1B

Refrigerator

1C
2A

Refrigerator-

2B

freezer

Shape
VerticalType
Horizontal
Type
VerticalType
Horizontal
Type

Inverter Control
Motor

Calculation Formula of Standard Energy Consumption
Efficiency

There is.

E = 0.345V1 + 86nR + 64dR + 315

There isn’t.

E = 0.766V1 + 86nR + 64dR + 106-

E = 1.12V1 + 70nR + 34dR + 237-

E = 0.872V1 + 86nR + 64dR + 186nF + 295dF – 113-

E = 2.43V1 + 70nR + 34dR + 157nF + 157dF – 1831

Note 1. The “vertical type” means those the height of which based on the external dimensions
stipulated by JIS B 8630 (hereinafter referred to as “external height”) is over 1,000 mm
and the door of which opens toward the front side. The same applies hereinafter.
2. The “horizontal type” means those the external height of which is 1,000 mm or lower
and the door of which opens toward the front side. The same applies hereinafter.
3. E is the value of the standard energy consumption efficiency (unit: kWh/year).
The same applies hereinafter.
4. V1 is the adjusted internal volume calculated by the following formula, rounding thenumber after the decimal point.
Category “1A” and “1B”
V1 = 800/d x VR
Category “1C”
V1 = 600/d x VR
Category “2A”
V1 = 800/d x (VR + 2.48VF) + 887
Category “2B”
V1 = 600/d x (VR + 3.74VF) + 336
However, as a result of the above mentioned calculation, if the adjusted internal
volume becomes the lower limit value stipulated for each category in the following tableor lower than that, then the lower limit value is used as the adjusted internal volume.
Category

Lower Limit Value

1A

500

1B
1C

500
75

2A

1930

2B

750

5. d is the depth (unit: mm) based on the external dimensions stipulated by JIS B 8630.
The same applies hereinafter.
6. VR is the rated internal volume of a chiller (unit: liter). The same applies hereinafter.
7. VF is the rated internal volume of a freezer (unit: liter). The same applies hereinafter.
8. nR: The number of places behind side-by-side doors of a chiller where center pillars are
not installed
9. nF: The number of places behind side-by-side doors of a freezer where center pillars
are not installed
10. dR is used as dR = 1 for chillers with multiple doors (i.e. those which have doors thenumber of which is more than the standard number of doors stated in the following
table according to the external width (W: unit, mm) stipulated by JIS B 8630) and as dR= 0 for others.
Shape
VerticalType
Horizontal
Type

External Width

Standard Number of Doors

825 mm or under2

Over 825 mm up to 1,650 mm

4Over 1,650 mm

6

1,050 mm or under

1

Over 1,050 mm up to 1,650 mm

2Over 1,650 mm

3

11. dF is used as dF = 1 for freezers with multiple doors and as dF = 0 for others. The same
applied hereinafter.

2

Table 2 Standard Energy Consumption Efficiency for Commercial Freezers
Calculation Formula of Standard Energy Consumption
Category
Shape
Efficiency
3A
Vertical TypeE = 1.96V2 + 186nF + 295dF + 788
3B
Horizontal TypeE = 4.12V2 + 157nF + 157dF + 349
4A
Chest Freezer
E = 1.16V2 + 211
4B
Freezer-stocker
E = 1.39V2 + 359
Note 1. The “chest freezers” are those which open upward with a door which is pulled up.
2. The “freezer-stockers” are those which open upward with a door which slides leftward
and rightward.
3. E is the value of the standard energy consumption efficiency (unit: kWh/year).
4. V2 is the adjusted internal volume calculated by the following formula, rounding thenumber after the decimal point.
Category “3A”
V2 = 800/d x VF
Category “3B”
V2 = 600/d x VF
Category “4A” and “4B”
V2 = VF
However, as a result of the above mentioned calculation, if the adjusted internal volume
becomes the lower limit value stipulated for each category in the following table or lower
than that, then the lower limit value is used as the adjusted internal volume.
Category
Lower Limit Value
3A

500

3B

75

4A

250

4B

50

(3) Energy consumption efficiency measurement method [See Attachment 5]
The energy consumption efficiency of commercial refrigerators, etc. shall be theannual energy consumption (kWh/year), and the measurement method shall be themethod specified in JIS B 8630 as “Commercial refrigerators and freezer Characteristics and test methods”.
As regards those with additional functions such as defrosting water-discharge
forced evaporation function, forced heat-discharge function or heating andheat-retention function, the measurement can be done regarding them as standard
products without additional functions.
(4) Display items and others
Items concerning the display are as follows.
1) Display items
Display items shall be as follows.
i) Product name and model nameii) Categoryiii) Rated internal volume (liter)iv) Depth size (mm)v) The number of places behind the side-by-side doors of a chiller where center
pillars are not installed3vi) The number of places behind the side-by-side doors of a freezer where center
pillars are not installedvii) For those with multiple doors as stipulated in the paragraph (2) above, thestatement that there are multiple doors.
viii) Annual energy consumption (kWh/year)ix) Manufacturer’s name2) Compliance itemsi) The energy consumption efficiency must be indicated as annual energy
consumption by integers by the unit of kWh/year. In this case, the energy
consumption and the allowable value must follow the stipulation of JIS B 8630
“Commercial refrigerators and freezers - Characteristics and test methods”.
ii) The display items stipulated in the foregoing paragraph 1) must be displayed at
noticeable places on the product. In this case, the display items must be written
directly on the product or on a label made of metal or of synthetic resin which is
attached to the product in a way that makes it difficult to take it away. The
display items must be written in an indelible way.
iii) As regards refrigerators, etc. with additional functions which were measured as
standard products without additional functions, the display must state so andthat the energy consumption in actual use may be greater than the value
measured.
4. Proposals for energy saving(1) Actions of manufacturers
1) Manufacturers shall promote technological development toward energy
conservation of commercial refrigerators, etc. and attempt to develop products withexcellent energy consumption efficiency.
2) From the viewpoint of promoting the spread of commercial refrigerators, etc. withexcellent energy consumption efficiency, manufacturers shall attempt to provide
appropriate information to encourage users to select commercial refrigerators, etc.
with excellent energy consumption efficiency by displaying newly chosen products
in catalogues, etc.
3) Manufacturers shall endeavor not only to develop energy saving technologies
suitable for a measuring method of energy consumption efficiency but also todevelop energy saving technologies suitable for the actual status of the usage ofusers.
(2) Actions of retailers
Retailers shall not only try to sell commercial refrigerators, etc. with excellent energy
consumption efficiency, but also offer appropriate information to users so that they can
select commercial refrigerators, etc. with excellent energy consumption efficiency.

4(3) Actions of users
Users shall attempt to not only select commercial refrigerators, etc. with excellent
energy consumption efficiency but also reduce energy by using commercial
refrigerators, etc. while actively using energy conservation setting.
(4) Actions of Government
1) From the viewpoint of promoting the spread of commercial refrigerators, etc. withexcellent energy consumption efficiency, the government shall attempt to takenecessary action such as the spread and enlightenment activities, in order topromote actions of users and manufacturers.
2) The government shall periodically and continuously check implementation of thedisplay items by manufacturers and attempt at appropriate operation of the law sothat information on energy consumption efficiency can be provided to users incorrect and easily understandable manner.
3) The energy-saving standard based on the Top Runner Program is a very effective
approach to energy saving of products. Therefore, the government shall makeefforts to spread it internationally, by taking appropriate opportunities.

5

Attachment 1

Scope of the Target Commercial Refrigerators, etc.

1. Basic Idea
The commercial refrigerators, etc. as the target scope of this review shall be theelectric refrigerators, etc. stipulated by JIS B 8630 as the application scope ofCommercial refrigerators and freezers - Characteristics and test methods (limited tothose which include one or more of HFC-125, HFC-143a and/or HFC-134a in theirrefrigerant), excluding “type I chilled air forced circulation refrigerators (chilled air forced
circulation refrigerators the rated storage temperature’s lower limit of which is 0°C or
above)”, “chilled air natural convection refrigerator-freezers” and “type I chilled air forced
circulation refrigerator-freezers (chilled air forced circulation refrigerator-freezers whosechiller’s lower limit for the rated storage temperature is 0°C or above)”).
The target scope covers approximately 85% of the shipping quantity even if the following
products are excluded.
2. Exclusion from Target Scope
The following products are excluded from the scope of the target commercial
refrigerators, etc.
The basic concept of the exclusion is that (1) products used for special purpose, (2)products for which technical measurement methods and evaluation procedures have notbeen established yet and (3) products the use of which in the market is extremely rareare excluded from the target scope. The products stated in (1) above are excluded in JIS
B 8630 too.
(1) Products excluded from the target scope because evaluation procedures have notbeen established yet.
1) Products with a refrigeration chamber of constant temperature and high humidity
using its inner wall as a cooling surface (Reference 1-8 and 1-9).
Evaluation procedures for these products have not been established yet because
they are special, for example, making the refrigerator inside with double stainlessboxes and letting chilled air flow through the gap between the boxes to do indirect
cooling, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 6.0 thousand units
2) Horizontal type products with an opening on the top (sandwich table) (Reference
1-10)
Evaluation procedures for these products have not been established yet because
they are special, i.e. making an opening on the top of the top board and putting afood container in the opening to seal it, so they are excluded from the target scope.

6

* Estimated shipping quantity (FY2006): Approx. 2.0 thousand units
3) Products which quickly cool and freeze food for storage at the temperature of minus
30°C or under (freezer) (Reference 1-12)
Evaluation procedures for these products have not been established yet because
they are special, i.e. quickly cooling and freezing food after cooked for storage at
the temperature of minus 30°C or under. And their shipping quantity is few, so they
are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 1.3 thousand units
4) Low temperature chest freezers (Reference 1-15)
Evaluation procedures for these products have not been established yet because
they are special as the temperature in the freezer is set at minus 30°C or below tomake the freezing power greater than that of the standard type, and the shipping
quantity is few, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.8 thousand units
5) Locker type products with many independent storage chambers (Reference 1-16)
Evaluation procedures for these products have not been established yet because
they are special as they are mainly used out of the kitchen, have a compressor
mounted on the bottom and have many independent storage chambers controlling
the temperature of all chambers, and the shipping quantity of these products is few,
so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.5 thousand units
6) Products with a door which is pulled out (Reference 1-20)
Evaluation procedures for these products have not been established yet because
they are special as they are used in the kitchen whose space is too small for the
products with side-by-side doors, and the shipping quantity of these products is few,
so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.3 thousand units
7) Products having three or more temperature setting ranges which do not overlap
each other in one refrigeration box (Reference 1-21)
Evaluation procedures for these products have not been established yet because
they are special as they have a cooling unit and a refrigerant pipe, etc. forrefrigeration and freezing to control three different temperature zones in one unit,
and the shipping quantity of these products is few, so they are excluded from thetarget scope.
* Estimated shipping quantity (FY2006): Approx. 0.3 thousand units

78) Products which can store the cart directly into the refrigerator (Reference 1-23)
Evaluation procedures for these products have not been established yet because
they are special as they can preserve food on the cart as is, although their structure
is similar to that of normal vertical products, and the shipping quantity of theseproducts is few, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.1 thousand units
9) Products with a showcase (food showcase, etc.) (Reference 1-24)
Refrigerators with a showcase for showing food at a sushi restaurant, etc. are
special because an additional purpose is added to the original purpose ofrefrigerators which is to preserve food. So there are no evaluation procedures
established for these refrigerators and their shipping quantity is few. So they are
excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.3 thousand units
10) Products which can be moved and use cooling storage material (cold roll box)
(Reference 1-25)
Refrigerators used to bring food from the kitchen to the place where people are ina hotel or inn are special because they use cooling storage material to keep thefood inside cool even if there is no power supply. So there are no evaluation
procedures established for these refrigerators, and their shipping quantity is few. So
they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.1 thousand units(2) Products which are excluded from the target scope because they are used for special
application and their shipping quantity is few.
1) Horizontal type products the storage chamber’s height of which is 650 mm or lower(Reference 1-7)
The height of these refrigerators is designed to be lower than that of normal
horizontal refrigerators (650 mm or lower) and they are used with a cooking range
placed on them or with a sink so that the kitchen space is efficiently used. However,their shipping quantity is few, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 4.0 thousand units
2) Water cooling type products (Reference 1-18 and 1-22)
These refrigerators are used in special places such as underground malls where
heat discharge is limited and their shipping quantity is few, so they are excluded
from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.7 thousand units

83) Products with double sided doors (Reference 1-11 and 1-17)
These refrigerators are mainly used at the border between the kitchen and therestaurant, but their shipping quantity is few, so they are excluded from the target
scope.
* Estimated shipping quantity (FY2006): Approx. 2.0 thousand units
4) Vertical freezers (Reference 1-13)
These freezers are used to preserve food for school-provided lunch for the
purpose of food inspection, so they are designed to pull out the container preserving
food. Their shipping quantity is few, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 1.0 thousand units
5) Products of chilled air natural convection system (Reference 1-5)
These refrigerators are cooled by natural convection of chilled air so the recovery
from the temperature change in the refrigerator is slow compared with that of theforced circulation system. They are used in small spaces such as behind thecounter of a coffee shop. Their shipping quantity is rapidly decreasing in theseyears because some manufacturers are withdrawing from making theserefrigerators, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006 to 2007): Decreasing from approx. 7.4 to 5.0
thousand units
6) Products with a drawer of slide rail system (drawers) (Reference 1-6)
These refrigerators adopt a drawer of slide rail system so that food can be easily
put in and taken out, to be used at places where work efficiency is important, suchas hotels. Their specifications are specialized for the place they are used, so they
are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 5.0 thousand units
7) Vertical type products the height of which is 2,050 mm or higher (Reference 1-14)
These refrigerators are used not in the kitchen but mainly in the backyard of asupermarket for storing food in the place of prefabricated refrigerators. Theirshipping quantity is few, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.9 thousand units
8) Products used exclusively for cold storage of milk (Reference 1-19)
These are refrigerators of chilled air forced circulation system whose lower limit of
the rated storage temperature is 0°C or higher. They are exclusively used topreserve milk for school-provided lunch, but their shipping quantity is few, so they
are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.8 thousand units99) Horizontal type products with an electro magnetic cooker (Reference 1-24)
These are complex refrigerators which can both preserve food and cook it on theunit. Their shipping quantity is very few, so they are excluded from the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.05 thousand units
10) Products modified or specially customized
The size, the freezing capacity of the compressor or the thermal insulation
performance of these refrigerators is customized for special users. If their yearlyshipping quantity is less than 50 units, they are excluded from the target scope,but if they are equipped with additional functions stipulated in the measurement
method, they are included in the target scope.
* Estimated shipping quantity (FY2006): Approx. 0.8 thousand units

10Attachment 2

Target Fiscal Year, etc. of Commercial Refrigerators, etc.

1.

In general, a considerable improvement in energy consumption efficiency ofcommercial refrigerators, etc. is made when a model change takes place and major
model change accompanying change of the cabinet size or shape takes placeapproximately every 10 to 20 years. During this period, minor change takes placeapproximately every 5 to 6 years to improve the performance. For this reason, if an
opportunity for improving the energy consumption efficiency is to be given to commercial
refrigerators, etc. at least once or twice, it seems 8 to 9 years are appropriate.
Therefore, it is appropriate to set the target year of commercial refrigerators, etc. to be
the fiscal year 2016 which is 9 years after the standard fiscal year (FY2007).

2.

In addition, it is expected that the improvement rate of the annual energy consumption(kWh/year) in the target fiscal year will be approximately 22.7%, based on theassumption that there will be no change from the standard fiscal year’s volume of
shipments and composition of each category (results of the fiscal year 2007)(approximately 26.5% for commercial refrigerators, 22.4% for commercial
refrigerator-freezers and 20.7% for commercial freezers).

<Overview of Estimation>(1) The annual energy consumption calculated from values of actual achievements ofcommercial refrigerators, etc. shipped in the fiscal year 2007:
Approximately 1,604 kWh/year(2) The annual energy consumption estimated from the target standard value ofcommercial refrigerators, etc. to be shipped in the target fiscal year:
Approximately 1,239 kWh/year(3) Improvement rate of the energy consumption efficiency:(1,604 - 1,239)/1,604 x 100 = Approximately 22.7%<Overview of Estimation: Commercial Refrigerators>(1) The annual energy consumption calculated from values of actual achievements ofcommercial refrigerators shipped in the fiscal year 2007:
Approximately 912 kWh/year11

(2) The annual energy consumption estimated from the target standard value ofcommercial refrigerators to be shipped in the target fiscal year:
Approximately 670 kWh/year(3) Improvement rate of the annual energy consumption:(912 - 670)/912 x 100 = Approximately 26.5%<Overview of Estimation: Commercial Refrigerator-freezers>(1) The annual energy consumption calculated from values of actual achievements ofcommercial refrigerator-freezers shipped in the fiscal year 2007:
Approximately 2,706 kWh/year(2) The annual energy consumption estimated from the target standard value ofcommercial refrigerator-freezers to be shipped in the target fiscal year:
Approximately 2,099 kWh/year(3) Improvement rate of the annual energy consumption:(2,706 - 2,099)/2,706 x 100 = Approximately 22.4%<Overview of Estimation: Commercial Freezers>(1) The annual energy consumption calculated from values of actual achievements ofcommercial freezers shipped in the fiscal year 2007:
Approximately 1,755 kWh/year(2) The annual energy consumption estimated from the target standard value ofcommercial freezers to be shipped in the target fiscal year:
Approximately 1,391 kWh/year(3) Improvement rate of the annual energy consumption:(1,755 - 1,391)/1,755 x 100 = Approximately 20.7%

12

Attachment 3

Classification of Commercial Refrigerators, etc.
1. Basic Idea
Commercial refrigerators, etc. are classified based on the principles referred to in “thebasic idea concerning the preparation and revision of the standards of judgment for
manufacturers, etc. to be considered in relation to the improvement of the performance ofspecific equipment” (the 10th Energy Efficiency Standards Subcommittee of the Advisory
Committee for Natural Resources and Energy, revised on June 18, 2007) (hereinafterreferred to as merely “the principles”).
In case of commercial refrigerators, etc., although the energy consumption amount perunit is greater than those for home-use, the market size of those for commercial-use issmall and their shipping quantity is few. Therefore, if they are classified into too small
groups, the number of products or shipping quantity of some groups becomes very few.
Therefore, while using functional formulae, they are classified by fewest possible indicesbased on the principles.
“The basic idea concerning the preparation and revision of the standards of judgment for
manufacturers, etc. to be considered in relation to the improvement of the performance of specificequipment”- Extract –Principle 2: The specific equipment is classified based on certain indices. The indices (basic indices)
are those which are deeply related to the energy consumption efficiency, such as physicalamount, functions, and they are determined considering factors which consumers use as
standards when choosing products (factors representing consumers’ needs).
Principle 3: The target standard value is determined by one value or functional formula for eachcategory of the basic indices which are possible or appropriate to aim at the same energy
consumption efficiency.
Principle 4: When setting the classifications, additional functions are disregarded in principle. However,if the energy consumption efficiency of a product without an additional function is set as atarget standard value and, because of this product, other products with the additional
function in question are likely to withdraw from the market, despite the fact that the needs
for those products are thought to be high in the market, because they cannot comply withthe target standard value thus set, then it is acceptable to make another category (sheet)for those products.
Principle 5: As regards products which are expensive but excellent in energy consumption efficiency
because they use high energy conservation technologies, although it is possible to classify
them into separate categories, it is desirable to treat them in the same category as muchas possible so that manufacturers can actively sell the products with excellent energy
consumption efficiency.
Principle 6: When setting a target standard value for one category, special products are excluded.
However, when studying the improvement of the efficiency realized by technology
development, etc., the feasibility of the technologies of the special products thus excluded
must be studied too.

13

2. Specific Classification Method
Commercial refrigerators, etc. shall be classified based on the following threecharacteristics.
1) Classification by the type of refrigerators
2) Classification by the shape3) Classification by the use of inverter control motors(1) Classification by the type of commercial refrigerators, etc.
Commercial refrigerators, etc. are classified1 as follows according to the type of
their storage chambers, the application and the purpose of use.
○ Refrigerators○ Refrigerator-freezers○ Freezers(2) Classification by the shape
Unlike normal vertical commercial refrigerators, etc., horizontal refrigerators aremainly placed under a cooking table of a kitchen. Therefore, the space of a horizontal
refrigerator allocated for its cooling device is limited, making it difficult to make theheat exchanger larger, which is effective for improving the energy conservation
performance, limiting the application of energy conservation technologies in contrast
to vertical refrigerators.
Chest freezers are equipped with a door which opens upward and they are usedmainly to preserve frozen food in the backyard of a store. The door is opened andclosed less frequently to maintain the temperature inside the freezer, so it is possible
to apply thermal insulation structure to the door.
Meanwhile, in case of freezer-stockers, although their door also opens upward, theopening and closing of the door is made easy using a light sliding door, because they
are used to display commodities at the selling floor of a store. Therefore, their door is
not thermally insulated and the sealing performance is low, so its performance as acommercial product conflicts with the performance of an energy conservation product.
From the observation above, it can be said that commercial refrigerators, etc. havethe shape which is suitable for their application and the shape deeply concerns withenergy conservation performance. Therefore, they are classified as follows.

1

In case of electric refrigerators, etc. for home-use which are already the target equipment of the
Top Runner Program, electric refrigerators (refrigerators and refrigerator-freezers) and electricfreezers are treated as different specific equipment. Similarly, commercial refrigerators, etc. arecorrectly classified into refrigerators and refrigerator-freezers, and freezers are treated as different
equipment. But, as the standard values are set individually for them, they are treated same under the
Energy Conservation Act. So they are expressed as “Classification” here for convenience.

14

○ Vertical type
○ Horizontal type○ Chest freezer (freezer only)○ Freezer-stocker (freezer only)

Vertical Type

Horizontal Type

Chest Freezer (freezer only)

Freezer-stocker (freezer only)15

(3) Classification by the use of inverter-control motors
The annual energy consumption of vertical refrigerators greatly varies depending on
the use of inverters, but unlike refrigerators for home-use, inverter compressors which
are optimal for each capacity are not readily lined up because the market size forthese refrigerators is small. To be more specific, while constant speed compressors
are being lined up meticulously from 130 to 300 W, in case of inverter compressors,
there are 2 types of the same specifications, so, as far as the capacity is concerned,
there is actually only one type, and business operators of commercial refrigerators
have no choice other than use this inverter compressor.
Especially, in case of vertical refrigerators with small adjusted internal volume,business operators are forced to buy expensive equipment the inverter effect of which
is not sufficient, which is unreasonable for them. Therefore, it was decided that thevertical refrigerators are classified by the use of inverters, and the target standard
value, especially that for refrigerators with large adjusted internal volume, is set high topromote high efficiency and the spread of inverters.
Figure 3-1 Comparison between Constant Speed and 1 Inverter of Vertical
Refrigerators

Energy Consumption (kWh/Y)

Reference ofCompressor Capacity

InverterConstant Speed
Line (Target Line)
Line (Constant Speed Target Value)

Adjusted Internal Volume (L)16

<Line-up and Effect of Compressors>
Product Type (Width mm)

600-800

900

1,200

1,500

1,800

Constant Speed Compressor (W)

130

200

200

300

300

◎

○

Inverter Compressor (W)

190 (130-300)

Energy Conservation Effect

△

△

○

(◎: 30% or more, ○: 20-30%, △: 10-20%)

It is also possible to classify vertical refrigerator-freezers by the use of inverters, buteven if an inverter is installed, except for refrigerator-freezers with two inverters, it isinstalled in the chiller side, not in the freezer side where annual energy consumption isgreater. Therefore, although there is difference in case of refrigerator-freezers withsmaller adjusted internal volume (refrigerator-freezers the freezer of which is smaller),the difference due to the use of inverters is small as a whole. So they are not classified
here.

Energy Consumption (kWh/Y)

Figure 3-2 Comparison between Constant Speed and 1 Inverter of Vertical
Refrigerator-freezers

Constant Speed
Inverter

Adjusted Internal Volume (L)173. Summary of Classification
According to the indices described in section 2 above, the classification is made as per
Table 3-1 and Table 3-2.
Table 3-1 Classification of Commercial Refrigerators and Commercial
Refrigerator-freezers
Category

Type ofRefrigerator

1A
1B

Refrigerators

1C
2A

Refrigeratorfreezers

2B

Shipping Quantity(Units)
7,900

Shape

Inverter Control Motor

Vertical Type

There is.
There isn’t.

Horizontal Type―52,553

Vertical Type
Horizontal Type―24,501―

11,90010,594Note 1. The “vertical type” means those the height of which based on the external dimensions
stipulated by JIS B 8630 (hereinafter referred to as “external height”) is over 1,000 mm
and the door of which opens toward the front side. The same applies hereinafter.
2. The “horizontal type” means those the external height of which is 1,000 mm or lower
and the door of which opens toward the front side. The same applies hereinafter.

Table 3-2 Classification of Commercial Freezers, etc.
Category

Shape

Shipping Quantity (Units)

3A

Vertical Type

20,7393B

Horizontal Type

7,500

4A

Chest Freezers

15,6894B

Freezer-stockers

16,255Note 1. The “chest freezers” are those which open upward with a door which is pulled up.
2. The “freezer-stockers” are those which open upward with a door which slides leftward
and rightward.

18

Attachment 4

Target Standard Values of Commercial Refrigerators, etc.
1. Idea on Setting Target Standard Values
We shall set target standard values based on the idea of Top Runner Program. The
specific policy shall be as follows:
1) A target standard value shall be set for every appropriately defined category.
2) For any category for which possible improvement of efficiency is anticipatedbecause of future technology advancement, a target standard value shall allow for
the improvement wherever possible.
3) Target standard values shall not be inconsistent among categories.
2. Specific Technologies for Improving Energy Consumption Efficiency and Possible
Improvement
Before determining target standard values for commercial refrigerators, etc., theimprovement of technologies expected to be applied to each category was studied. As aresult, it was found that the improvement can be expected mainly from the following energy
conservation technologies.
Application of new high-tech technologies (optimal control of inverter control)
Study and application of new thermal insulation material (vacuum thermal insulationmaterial, etc.)
Review of the energy conservation technologies implemented in the past andpromotion of further improvement
Efficiency improvement by changing refrigerantThis is not to say that the improvement of the energy consumption efficiency is possible
because epoch-making technologies are expected to be developed but to say that it isrealized by the improvement and extended application of already-existing technologies.
As regards inverters, it is important to study its possibility considering the fact that theavailable models of inverters provided by compressor manufacturers are limited and thatthe vacuum thermal insulation material does not have a sufficient energy consumption
saving effect for all refrigerators.
The specific contents of the improved technologies and the feasibility of applying them toeach category (Table 4-1) are as follows.
(1) Improvement of compressor’s efficiency
It is being tried to improve compressor motors of refrigerators by enhancing the
motor efficiency by adopting operation condensers, improving the motor efficiency byincreasing the motor core’s thickness, reducing the mechanical loss of the sliding
section by making the motor shaft smaller, enhancing the volume efficiency byminimizing the top clearance. Furthermore, additional improvement can be expectedby adopting the inverter motor the number of revolution of which can be changed, by

19

changing the AC motor to the DC motor, by changing the distributed winding to theconcentrated winding (direct winding) and so on.
(2) Technologies for improving the performance of fans
1) High-efficiency of fan motors in refrigerators
To change AC motors to DC brushless motors with high efficiency.
2) Improvement of efficiency of condenser’s fan motors
It is being tried to make the efficiency of condenser’s fan motors high by improving
the fan shape to make the air amount greater while containing the noise. As
regards motors, it is expected that improvement can be made by enhancing the
motor efficiency by adopting condenser motors and high efficiency DC motors.
(3) Technologies for improving efficiency of control
1) Control of dew condensation prevention heaters
It is possible to improve the efficiency of dew condensation prevention heaters
around doors with the micro-computer control by changing the control from the way
which always supplies electricity to the way which controls the optimal electricity
supply ratio.
2) Control of the number of revolution of compressor motors (using the inverter)
Improvement is realized by changing the AC motor to the high efficiency DC motorand by controlling the number of revolution with the micro computer.
(4) Improvement of performance by reviewing thermal insulation structure
The thermal insulation performance can be improved by reviewing the foaming
structure and the thermal insulation structure including each sealing section (unit, door,etc.) to control the heat leakage.

20

Table 4-1 Technologies for Improving Commercial Refrigerators, etc. and
Improvement Ratio
Improvement of Fan’s
Performance
InsideRefrigerator

Control of Dew
Condensation
Prevention
HeaterControl of Frost
Removal Heater

Inverter
Control

Thermal Insulation
Structure (Including
Pillar-less)TargetImprovement
Ratio (%)

○

-

○

○

○

○

31.1

○

○

○

○

○

-

○

23.6

○

○

○

○

○

-

○

26.6

○

○

-

○

○

○

○

26.7

○

○

○

○

○

-

○

12.3

Vertical Freezers

○

○

○

○

○

○

○

19.6

Horizontal Freezers

○

○

○

○

○

-

○

25.8

Chest Freezers

○

-

-

-

-

-

○

22.5

Freezer-stockers

○

-

-

-

-

-

○

18.8

Improvement ofCompressor’s
Efficiency

Condenser

Vertical Refrigerator
Inverter
Vertical Refrigerator
Constant Speed
Horizontal
Refrigerators
Vertical
Refrigerator-freezers
Horizontal
Refrigerator-freezers○

Category

3. Specific Calculation Formula of a Target Standard Value (Standard Energy Consumption
Efficiency)
According to the categories of commercial refrigerators, the Top Runner values wereobtained from the actual measurement values (FY2007) of the annual energy consumption(kWh/year), and the annual energy consumption value (kWh/year) considering theimprovement up to the target fiscal year in each category was taken as the target standard
value.
Meanwhile, as the annual energy consumption correlates to the internal volume, thecalculation formula of a target standard value of commercial refrigerators, etc. shall be
expressed by a linear function expression with the adjusted internal volume as a variable.
This is the calculation formula of the standard energy consumption efficiency considering
the effect of the center-pillar-less and the number of doors too. The specific values areshown in Table 4-2 and 4-3 below.
Table 4-2 Standard Energy Consumption Efficiency of Commercial Refrigerators andCommercial Refrigerator-freezers
Category

1A
1B

Type ofRefrigerator
Refrigerator

1C
2A
2B

RefrigeratorFreezer

Shape
VerticalType
Horizontal
Type
VerticalType
Horizontal
Type

Inverter Control
Motor
There is.

Calculation Formula of Standard Energy Consumption
Efficiency

There isn’t.

E = 0.345V1 + 86n R + 64d R + 315
E = 0.766V1 + 86nR + 64d R + 106―

E = 1.12V1 + 70nR + 34d R + 237―

E = 0.872V1 + 86nR + 64dR + 186nF + 295dF - 113―

E = 2.43V1 + 70nR + 34dR + 157nF + 157dF - 183

Note 1. The “vertical type” means those the height of which based on the external dimensions
stipulated by JIS B 8630 (hereinafter referred to as “external height”) is over 1000 mm
and the door of which opens toward the front side. The same applies hereinafter.

21

2. The “horizontal type” means those the external height of which is 1000 mm or lower andthe door of which opens toward the front side. The same applies hereinafter.
3. E is the value of the standard energy consumption efficiency (unit: kWh/year).
The same applies hereinafter.
4. V1 is the adjusted internal volume calculated by the following formula, rounding thenumber after the decimal point.
Category “1A” and “1B”
V1 = 800/d x VR
Category “1C”
V1 = 600/d x VR
Category “2A”
V1 = 800/d x (VR + 2.48VF) + 887
Category “2B”
V1 = 600/d x (VR + 3.74VF) + 336
However, as a result of the above mentioned calculation, if the adjusted internal volume
becomes the lower limit value stipulated for each category in the following table or
lower than that, then the lower limit value is used as the adjusted internal volume.
Category

Lower Limit Value

1A

500

1B

500

1C

75

2A

1930

2B

750

5. d is the depth (unit: mm) based on the external dimensions stipulated by JIS B 8630.
The same applies hereinafter.
6. VR is the rated internal volume of a chiller (unit: liter). The same applies hereinafter.
7. VF is the rated internal volume of a freezer (unit: liter). The same applies hereinafter.
8. nR: The number of places behind side-by-side doors of a chiller where center pillars are
not installed
9. nF: The number of places behind side-by-side doors of a freezer where center pillars
are not installed
10. dR is used as dR = 1 for chillers with multiple doors (i.e. those which have doors thenumber of which is more than the standard number of doors stated in the following
table according to the external width (W: unit, mm) stipulated by JIS B 8630) and as
dR = 0 for others.
Shape
VerticalType
Horizontal
Type

External Width

Standard Number of Doors

825 mm or under2

Over 825 mm up to 1,650 mm

4Over 1,650 mm

6

1,050 mm or under

1

Over 1,050 mm up to 1,650 mm

2Over 1,650 mm

3

11. dF is used as dF = 1 for freezers with multiple doors and as dF = 0 for others. The same
applied hereinafter.

22

Table 4-3 Standard Energy Consumption Efficiency of Commercial Freezers
Calculation Formula of Standard Energy Consumption
Category
Shape
Efficiency
3A
Vertical TypeE = 1.96V2 + 186nF + 295dF + 788
3B
Horizontal TypeE = 4.12V2 + 157nF + 157dF + 349
4A
Chest Freezer
E = 1.16V2 + 211
4B
Freezer-stocker
E = 1.39V2 + 359
Note 1. The “chest freezers” are those which open upward with a door which is pulled up.
2. The “freezer-stockers” are those which open upward with a door which slides leftward
and rightward.
3. E is the value of the standard energy consumption efficiency (unit: kWh/year).
4. V2 is the adjusted internal volume calculated by the following formula, rounding thenumber after the decimal point.
Category “3A”
V2 = 800/d x VF
Category “3B”
V2 = 600/d x VF
Category “4A” and “4B”
V2 = VF
However, as a result of the above mentioned calculation, if the adjusted internal volume
becomes the lower limit value stipulated for each category in the following table or
lower than that, then the lower limit value is used as the adjusted internal volume.
Category

Lower Limit Value

3A

500

3B

75

4A

250

4B

50

23

4. Factors of Calculation Formula of Standard Energy Consumption Efficiency(1) Calculation formula of adjusted internal volume
1) Depth adjustment factor (vertical type: 800/d, horizontal type: 600/d)
As the feature of commercial refrigerators, etc. (except for chest freezers andfreezer-stockers), as the front (door) area becomes large, the annual energy
consumption tends to become larger, because even if the volume is the same, theload caused by the opening and closing of the door is large, so as the front area
becomes large, the effect of heat leakage becomes large.
Meanwhile, there are thin refrigerator models with the same front area (doorarea) in the line-up of commercial refrigerators, etc. in order to cope with limited
installation spaces.
Therefore, as Figure 4-1 shows, the standard cannot be set simply by the rated
internal volume, so, as Table 4-2 shows, the correction factors were studied
according to the measurement results.
To be more specific, the standard depth size was divided by the actual depth size
and then multiplied by the rated internal volume to obtain the adjusted internal
volume and see the correlation. As a result, it was found that they almost coincide.
In other words, even if the rated internal volume becomes small as the depth size
becomes small, it does not affect the annual energy consumption much.
Therefore, it was decided to calculate the adjustment factors with the following
formulae.
Vertical Type
Horizontal Type: Depth Adjustment Factor = 800/d: Depth Adjustment Factor = 600/d
d: External depth size (unit: mm)

24

Energy Consumption (kWh/Y)

Figure 4-1 Effect of Depth Size in Vertical Refrigerators(Single Phase 600 mm, Single Phase 800 mm)

Vertical Refrigerators, Single Phase, 800
Vertical Refrigerators, Single Phase, Approx. 600
Line (Vertical Refrigerators, Single Phase, 800)
Line (Vertical Refrigerators, Single Phase, Approx. 600)

Rated Internal Volume (L)Energy Consumption (kWh/Y)

Figure 4-2 Effect of Depth Size in Vertical Refrigerators(Single Phase 600 mm, Single Phase 800 mm) (After Adjustment)

Vertical Refrigerators, Single Phase, 800
Vertical Refrigerators, Single Phase, Approx. 600 After Adjustment

Line (Vertical Refrigerators, Single Phase, 800)
Line (Vertical Refrigerators, Single Phase, Approx. 600 After Adjustment)

Adjusted Internal Volume (L)252) Temperature adjustment factor (A) and temperature adjustment constant (I)Of commercial refrigerators, etc., in case of refrigerator-freezers, the load is very
different between the chiller and the freezer, so, with the volume obtained by simply
adding both volumes, the correlation between the volume and the energy
consumption cannot be made clear.
However, if the freezer volume is converted to the refrigerator volume, theproportional correlation can be obtained between the refrigerator-freezer’s volume
and the load. Therefore, using the data of the refrigerator and the freezer, the factor,
etc. which convert the freezer volume to the refrigerator volume was calculated to
be used as the factor, etc. for obtaining the adjusted internal volume in the formulafor calculating the standard energy consumption efficiency.
The specific calculation methods are as follows.
Freezer: EF = SF x VF + IF
Refrigerator* : ER = SR x VR + IR
E : Energy consumption
S : Slant
V : Volume
I: Intercept
Then, from EF = ER
SF x VF + IF = SR x VR + IR
∴ VR = SFSR

x VF + IF – IRSR･･･ (a)○Calculation of temperature adjustment factor and temperature adjustment constantfor vertical products
The approximate lines based on the measurement result of vertical refrigeratorsand vertical freezers are shown in Figure 4-3. From the result of the approximate
formula based on this measurement data, the calculation is made using (a) above.
SF/SR (Temperature adjustment factor: A) ≈ 2.48
(IF - IR)/SR (Temperature adjustment constant: I) ≈ 887
The plot and the approximate formula after the correction made by thisadjustment formula are those shown in Figure 4-4. This result was incorporated into
the formula for calculating the adjusted internal volume of verticalrefrigerator-freezers.

26

Figure 4-3 Correlation between Vertical Freezers and Refrigerators

Vertical Refrigerators
Vertical Freezers

Energy Consumption (kWh/Y)Line (Vertical Refrigerators)
Line (Vertical Freezers)

Adjusted Internal Volume (L)Figure 4-4 Correlation between Vertical Freezers and Refrigerators (After Correction)

Energy Consumption (kWh/Y)

Vertical Refrigerators
Freezers after Correcting Slant and Intercept
Line (Vertical Refrigerators)
Line (Freezers after Correcting Slant and Intercept)

Adjusted Internal Volume (L)27

○Calculation of temperature adjustment factor and temperature adjustment constantfor horizontal products
The calculation for horizontal refrigerators and horizontal freezers was done thesame way as the calculation for the vertical products, and the result was as follows.
SF/SR (Temperature adjustment factor: A) ≈ 3.74
(IF - IR)/SR (Temperature adjustment constant: I) ≈ 336
Figure 4-5 Correlation between Horizontal Freezers and Refrigerators

Energy Consumption (kWh/Y)

Horizontal Refrigerators
Horizontal Freezers
Line (Horizontal Refrigerators)
Line (Horizontal Freezers)

Adjusted Internal Volume (L)Energy Consumption (kWh/Y)

Figure 4-6 Correlation between Horizontal Freezers and Refrigerators(After Correction)

Horizontal Refrigerators
Freezers after Correcting Slant and Intercept
Line (Horizontal Refrigerators)
Line (Freezers after Correcting Slant and Intercept)

Adjusted Internal Volume (L)28

(2) Adjustment of center-pillar-less (nR, nF) and multiple doors (dR, dF)
In case of commercial refrigerators, etc., models without pillars which are otherwise
placed at the center between 2 doors of the chamber are being manufactured for thereason to make it easy to put in or take out wider food (hereinafter referred to as“center-pillar-less”).
Center-pillar-less refrigerators, etc. need to make the capacity of the heater locatedat the center of the door bigger than that of the models with center pillars, in order toprevent dew condensation or frosting. For this reason, the energy consumption varies
depending on the number of places where center pillars are not installed.
Meanwhile, kitchens which use commercial refrigerators, etc. often have constrainson their space, so if the door of a refrigerator is too big, it is difficult to open it, and it
becomes the problem of the refrigerator.
Therefore, models with multiple doors are being produced, whereby the width ofeach door is made smaller than that of normal products and, instead, the number ofdoors is increased.
However, if doors are added, the number of dew condensation prevention heaters to
be mounted on center pillars must be increased, which in turn causes the energy
consumption to increase.
Still, if either of center-pillar-less products or multiple door products are not supplied,
it is likely to block the consumer’s needs, so it was decided to correct the standard
energy consumption efficiency of those products.
For the difference in the energy consumption used for each correction, thedifference of multi-door products or center-pillar-less products is was, and thedifference of comparable products with standard specifications was calculated, andthe average value was calculated.
However, since the improvement of the energy consumption efficiency cannot be
expected from simple addition, the addition value estimating the improvement of theenergy consumption was taken. Each addition value was calculated as follows.
<Center-pillar-less (one place)>
Vertical refrigerators: 86 kWh/year
Vertical freezers: 186 kWh/year
Horizontal refrigerators: 70 kWh/year
Horizontal freezers: 157 kWh/year<Multiple doors>
Vertical refrigerators
Vertical freezers
Horizontal refrigerators
Horizontal freezers: 64 kWh/year: 295 kWh/year: 34 kWh/year: 157 kWh/year29

○About center-pillar-lessWith pillars

Upper Pillar

Lower Pillar

Center-pillar-less◇ Refrigerators making the opening wider so that big plates or boxes can be easily put
in and taken out○
The photo is the example of the refrigerator the pillar-less number of which is nR = 2.

30

○About multiple doors (Example of the vertical refrigerator the width of which is 1,500 mm)<The model with standard number of doors><The model with multiple doors>

The photo is the example of multiple doors: dR = 1

Shape
VerticalType

Horizontal
Type

Table 4-4 Standard Number of DoorsStandard Number
External Widthof Doors
825 mm or under2
Over 825 mm up to 1,650 mm

4Over 1,650 mm

6

1,050 mm or under

1

Over 1,050 mm up to 1,650 mm

2Over 1,650 mm

331

5. Calculation Formula for Standard Energy Consumption Efficiency
As mentioned in Section 2 above, in case of commercial refrigerators, etc., thedevelopment of epoch-making technologies is not expected, but, instead, the effectrealized by the improvement and extended application of already existing technologies isgreat.
If the efficiency was enhanced to the level of the Top Runner product in each category,
approximately 18% of improvement would be realized only by that.
If the improvement must be made further than the level of the Top Runner based on theprinciples, much improvement is expected in the constant speed (without inverter control
motor) because it is being changed to the inverter control.
Note that the category 2A includes 2-inverter models.
2-inverter models are noted for their high energy consumption efficiency but theirshipping quantity is still few. So if the standard was made using 2-inverter models as Top
Runner, the product price would become high, making the supply of commercial
refrigerators, etc. difficult. Therefore, based on the principle 5, the spread rate of 2-inverter
models is estimated to be approximately 5% (FY2007 achievement: approx. 1%) and thetarget standard value of the category 2A is lowered.
Table 4-5 Improvement of Each Category
FY2007
Quantity
Sold(Units)EnergyConsumption(MWh/Y)

Vertical Refrigerators,
Inverter

7,900

8,158

1B

Vertical Refrigerators

10,594

1C

Horizontal Refrigerators

52,553Category

1A

2A
2B

Type

Vertical
Refrigerator-freezers
Horizontal
Refrigerator-freezers

Top Runner
EnergyConsumption(MWh/Y)Top Runner
Improvement
Ratio

Target Fiscal
Year Energy
Consumption(MWh/Y)

5,911

27.5%

5,620

31.1%

13,958

11,91914.6%

10,66623.6%

42,67332,52523.8%

31,335

26.6%

24,501

69,36056,05819.2%

50,86026.7%

11,90029,15525,755

11.7%

25,556

12.3%

Target Fiscal
Year
Improvement
Ratio

3A

Vertical Freezers

20,73968,80560,372

12.3%

55,33019.6%

3B

Horizontal Freezers

7,500

14,34010,90524.0%

10,640

25.8%

4A

Chest Freezers

15,68913,53910,48822.5%

10,48822.5%

4B

Freezer-stockers

16,255

8,957

7,276

18.8%

7,276

18.8%

Total

167,631

268,945

221,20817.7%

207,772

22.7%

32

Energy Consumption (kWh/yr)(1) Vertical refrigerators (with inverter)
E = 0.345V1 + 86nR + 64dR + 315

Standard Specifications
Line (Lower Limit Line)
Line (TOP Line)
Line (Target Line)

Energy Consumption (kWh/yr)

Adjusted Internal Volume (L)Standard
Specifications
Multiple Door
Specifications
Center-pillar-less
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)
Line (Center-pillar-less (2 Places) Target Line)

Adjusted Internal Volume (L)33

Energy Consumption (kWh/yr)(2) Vertical refrigerators (without inverter)
E = 0.766V1 + 86nR + 64dR + 106

Standard Specifications
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)

Energy Consumption (kWh/yr)

Adjusted Internal Volume (L)Standard Specifications
Multiple Door Specifications
Center-pillar-less
Line (TOP Line)
Line (Lower Limit Line)
Line (Target Line)
Line (Center-pillar-less (2 Places) Target Line)

Adjusted Internal Volume (L)34

Energy Consumption (kWh/yr)(3) Horizontal refrigerators
E = 1.12V1 + 70nR + 34dR + 237

Standard Specifications
Line (TOP Line)
Line (Lower Limit Line)
Line (Target Line)

Energy Consumption (kWh/yr)

Adjusted Internal Volume (L)Standard Specifications
Center-Pillar-lessMultiple DoorsLine (TOP Line)
Line (Lower Limit Line)
Line (Target Line)
Line (Center-Pillar-less (1 Place) Target Line)

Adjusted Internal Volume (L)35

Energy Consumption (kWh/yr)(4) Vertical refrigerator-freezers
E = 0.872V1 + 86nR + 64dR + 186nF + 295dF - 113

Standard Specifications
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)

Energy Consumption (kWh/yr)

Adjusted Internal Volume (L)Standard Specifications
1comp1eve
1,500 Width 6 Doors (4R2F): Multiple Doors
Center-pillar-less
TOP Line
Center-pillar-less (2 Places) Lower Limit Line
2 Inverters
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)
Line (Center-pillar-less (2 Places) Target Line)

Adjusted Internal Volume (L)36Energy Consumption (kWh/yr)(5) Horizontal refrigerator-freezers
E = 2.43V1 + 70nR + 34dR + 157nF + 157dF - 183

Standard Specifications
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)

Energy Consumption (kWh/yr)

Adjusted Internal Volume (L)Standard Specifications
Center-pillar-less
Line (TOP Line)
Line (Lower Limit Line)
Line (Target Line)
Line (Center-pillar-less (1 Place) Target Line)

Adjusted Internal Volume (L)37

Energy Consumption (kWh/yr)(6) Vertical freezers
E = 1.96V2 + 186nF + 295dF + 788

Standard Specifications
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)

Energy Consumption (kWh/yr)

Adjusted Internal Volume (L)Standard Specifications
Multiple Door Specifications
1 DoorCenter-pillar-less
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)
Line (Center-pillar-less (2 Places) Target Line)

Adjusted Internal Volume (L)38

Energy Consumption (kWh/yr)(7) Horizontal freezers
E = 4.12V2 + 157nF + 157dF + 349

Standard Specifications
Line (TOP Line)
Line (Lower Limit Line)
Line (Target Line)

Energy Consumption (kWh/yr)

Adjusted Internal Volume (L)Standard Specifications
Center-pillar-less
Line (TOP Line)
Line (Lower Limit Line)
Line (Target Line)
Line (Center-pillar-less (1 Place) Target Line)

Adjusted Internal Volume (L)39

Energy Consumption (kWh/yr)(8) Chest freezers
E = 1.16V2 + 211

Standard Specifications
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)

Adjusted Internal Volume (L)Energy Consumption (kWh/yr)(9) Freezer-stockers
E = 1.39V2 + 359

Standard Specifications
Line (TOP Line)
Line (Target Line)
Line (Lower Limit Line)

Adjusted Internal Volume (L)40

Attachment 5

Energy Consumption Efficiency of Commercial Refrigerators, etc. andMeasurement Method
1. Basic Idea
As regards electric refrigerators, etc. for home-use which have been designated as
the specific product of the Top Runner Standard since 1999, the “annual energy
consumption” measured by the method stipulated in JIS C 9801 “Household
Refrigerating Appliances - Characteristics and test methods” has been adopted to judge
their energy consumption efficiency.
As regards commercial refrigerators, etc. too, the same as refrigerators, etc. forhome-use, it is appropriate to take up the annual energy consumption as a practicalindex for judging their energy consumption efficiency.
So JIS B 8630 “Commercial refrigerators and freezers - Characteristics and test
methods” is basically adopted.
2. Specific Energy Consumption Efficiency and Measurement Method
The energy consumption efficiency for commercial refrigerators, etc. shall be annual
energy consumption (kWh/year), and the measurement method shall be the annual
energy consumption measured by the method stipulated by JIS B 8630 “Commercial
refrigerators and freezers - Characteristics and test methods”.
However, in case of refrigerators, etc. with additional functions such as defrostingwater discharge forced evaporation function, forced heat discharge function or heating
function, it is acceptable to measure them as standard products without additional
functions.

41

Attachment 6

Commercial Refrigerator and Showcase, etc. Evaluation Standards Subcommittee,
Energy Efficiency Standards Subcommittee of the Advisory Committee for Natural
Resources and Energy
Background of Holding
First Subcommittee Meeting (July 16, 2008)- Disclosure of the Commercial Refrigerator, Showcase, etc. Evaluation Standards
Subcommittee- Current situation of commercial refrigerators, showcases, etc.
- Scope of commercial refrigerators, etc. to be covered- Energy consumption efficiency of commercial refrigerators, etc. and its measurement
methodSecond Subcommittee Meeting (February 12, 2009)- Scope of showcases to be covered- Energy consumption efficiency of showcases and its measurement method
Third Subcommittee Meeting (May 25, 2010)- Proposed revision of the scope of commercial refrigerators, etc. to be covered and of
the measurement method- Classification of commercial refrigerators, etc. for setting targets- Target fiscal year and target standard value for commercial refrigerators, etc.
Fourth Subcommittee (July 6, 2010)- About interim report (proposal)

42

Attachment 7

Commercial Refrigerator, Showcase, etc. Evaluation Standards Subcommittee,
Energy Efficiency Standards Subcommittee of the Advisory Committee for Natural
Resources and Energy
List of Members
ChairmanMembers

Eiji HIHARA

Professor specialized in Environmental Studies,
Graduate School of Frontier Sciences, University ofTokyo (until the second meeting)Masao GOTO
Professor, Department of Marine Electronics andMechanical Engineering, Faculty of Marine Technology,
Tokyo University of Marine Science and Technology(appointed as chairman at the third meeting)
Chikai AOIChairman of Refrigeration Application System TechnicalCommittee, The Japan Refrigeration and Air
Conditioning Industry Association (changed to Kawai
from the third meeting)
Hideki KAWAI
Chairman of Refrigeration Application System TechnicalCommittee, The Japan Refrigeration and Air
Conditioning Industry Association (appointed as member
at the third meeting)
Shinichiro UTO
Japan Franchise Association
Hiroyuki KUDOU
General Manager of Technology, The Energy
Conservation Center, Japan (changed to Inoue from thethird meeting)Mamoru INOUE
General Manager of Technology, The Energy
Conservation Center, Japan (appointed as member at
the third meeting)
Haruki SATO
Professor, Department of System Design Engineering,
Faculty of Science and Technology, Keio University
Akio TANAKA
Planning and Research Manager, Jyukankyo ResearchInstitute, Inc.
Yoshihiko BABA
Member of Social and Environmental Committee, Japan
Supermarkets Association (changed to Hasegawa fromthe fourth meeting)Tadashi HASEGAWA Member of Social and Environmental Committee,
Japan Supermarkets Association (appointed as member
at the fourth meeting)
Tetsuo MUNAKATA Manager of Heat and Fluid Group, Energy Technology
Research Institute, Advanced Industrial Science andTechnology (changed to Takeuchi from the second
meeting)
Hiroshi TAKEUCHI Deputy Manager of Energy Technology ResearchInstitute, Advanced Industrial Science and Technology(appointed as member at the second meeting)Yoshio WATABE
Chairman of Showcase Technical Committee, The Japan
Refrigeration and Air Conditioning Industry Association

43

Reference 2

Current State of Commercial Refrigerators, etc.
Current State of Commercial Refrigerators, etc.
1. Definition of Commercial Refrigerators, etc.
(1) Overview
Commercial refrigerators, etc. are used in kitchens of restaurants, hotels, foodsupply facilities, etc. As they are designed to cope with the restrictions of the space
available in the kitchen they are installed in, there are many types of them. There isalso a type which is made by modifying a general-purpose type to make it mostsuitable for specific commercial use.
The difference between commercial refrigerators, etc. and refrigerators for homeuse is not only that the size and the internal volume of the former are large but alsothat the doors of the former are opened and closed very frequently and thespecifications of the former are designed to have sufficient cooling capacity even if
ambient temperature increases as combustion equipment around commercial
refrigerators, etc. is used. (While the internal volume of refrigerators, etc. forhome-use is up to approximately 550L, that of commercial refrigerators, etc. is up to
approximately 2,000L.)
Meanwhile, the specifications of the temperature inside commercial refrigerators,
etc. are roughly classified according to the use as refrigerators or freezers. In general,
the inner temperature is approximately -6°C in case of refrigerators andapproximately -20°C in case of freezers. Refrigerator-freezers are products which
can set two or more inner temperatures in one enclosure divided by a partition.
(2) Product classification
Commercial refrigerators, etc. are classified into 4 types, i.e. “vertical type”,“horizontal type”, “chest freezers” and “stocker type”, according to their usage andshape.
1) Vertical typeThis type is used mainly in kitchens of hotels, food supply facilities, etc.,
because it can make its internal volume per area it is installed in larger. Theinternal volume ranges approximately from 300L to 1,800L.
2) Horizontal typeThis type is featured by a work table placed on its top while making its heightapproximately 800 mm, so its internal volume per area it is installed in is smaller
than that of the vertical type.
3) Chest freezers
As the door of chest freezers is positioned on the top of the freezer body, theinner temperature is not affected much by the opening and closing of the door, sothey can store a lot of frozen food, etc. under a stable temperature.
-1-4) Stocker typeThis type has a top sliding door, so, the same as chest freezers, the innertemperature does not change much, therefore it is mainly used to store frozen
food.

Figure 2 Vertical Type Refrigerator, etc.

Figure 4 Chest Freezer

Figure 3 Horizontal Type Refrigerator, etc.

Figure 5 Stocker Type

2. Shipment Quantity of Commercial Refrigerators, etc. and Its Tendency(1) Domestic shipment
The domestic shipment quantity of commercial refrigerators, etc. tended toincrease since the later part of the 1980s as the convenience store and restaurant
industry developed, peaking in FY1996 with the shipment quantity of approximately
300 thousand units, boosted, in part, by the special demand caused by O-157
epidemic. After that, the shipment quantity tended to remain the same or decrease
and that of FY2007 was approximately 210 thousand units.

-2-Freezers(Thousand Units)

Refrigeratorfreezers
Refrigerators

StockerType
Chest
Freezers

Information Source: The Japan Refrigeration and Air Conditioning Industry Association. The same for the data hereafter.

(2) Shipment quantity by typeAs regards the yearly shipment quantity by type, the ratios of the vertical type andthe horizontal type are large and they remained the same since 2000, i.e. 90
thousand units in case of the horizontal type and 80 thousand strong units in case of
the vertical type. Meanwhile, that of chest freezers and stocker type continues to beapproximately 20 thousand units respectively.
(Figure 6)

Transition of Shipment Quantity of Commercial Refrigerators,
etc. by Main Type (Unit: Thousand Units)

Yearly Shipment Quantity(Thousand Units)

Yearly Shipment Quantity(Figure 1) Transition of Shipment Quantity ofCommercial Refrigerators, etc. (Unit: Thousand Units)

Vertical Type
Horizontal Type
Chest Freezers
Stocker Type
Total

(3) Main manufacturers
Orion Machinery Co., Ltd., SANDEN Corporation, SANYO Electric Co., Ltd., Daiwa
Industries Ltd., Toshiba Carrier Corporation, Hitachi Appliance, Inc., Fukushima
Industries Corp., Fujimak Corporation, Hoshizaki Electric Co., Ltd., Panasonic
Corporation-3-3. Functional Characteristics Required by Use Application(1) In case of commercial refrigerators, etc., functional characteristics which are different
from those of refrigerators, etc. for home-use are required for their cooling speed andthermal insulation performance.
1) Quick cooling function
As doors of commercial refrigerators, etc. are frequently opened and closed,
the function for quickly cooling the increased inner temperature is required.
In case of freezers, etc., the function for quickly cooling down hot objects to apreset temperature is required.
2) High thermal insulation performanceHigh thermal insulation performance is required to maintain the inside ofrefrigerators, etc. at a preset temperature in the kitchen, etc. where the ambient
temperature is high.
(2) In case of commercial refrigerators, etc. other than chest freezers and stocker type,there are many types which are individually designed and made according to therequirements of users because they are installed in a limited space. They are madeby the combination of approximately 400 basic types with optional design, so they
are typical multiple-type, small-production products.
(3) For kitchens of hotels or fast food restaurants and for the food or foodstuff processing
and selling business, shape and functions as exampled below are requested
according to the use application.
Horizontal type (drawer): To enhance work efficiency or the efficiency of the
management of foodstuff, the door is made like a drawer instead of making
side-by-side doors and food is directly put in the inner container.
Constant temperature and high humidity type: The temperature does notchange much and the humidity is high, so food can be kept fresh. Besides, it is notnecessary to wrap foodstuff.
Double sided doors: Doors are made at the front side and the rear side of therefrigerator to provide food in one-way, i.e. from the kitchen side to the customer
side.
There are products modified to enhance the cooling capacity by selecting
compressors to be mounted according to the frequency of opening and closing ofdoors and things to be put in the refrigerator.

-4-

Usage of Commercial Refrigerators, etc.

Sales

RentalRestaurants

Food Processing

Fishery Agriculture

TransporSafety
tationFoodServiceBusiness Type

Usage and Purpose

Schools
Hospitals
Welfare facilities
Food service centers

Preservation of foodstuff,
preservation of diet foodPublic health centers

Preservation of diet food

Characteristics of Equipment

Front and rear door type, cart delivery type

Courier service, postal Preservation of food to beservicedelivered

Vehicle-mounted type

Producers

Preservation of bacteria,preservation of produce

Production
Associations

Preservation of crops

Markets

Refrigeration and retention of
Dedicated containers
freshness, freezing preservation

Bread-making
Preservation and fermentation
Confectionery-making of doughPreservation and fermentation
Noodle-making
of noodle
Constant temperature, high humidity type
Preservation and fermentation
Meat factories
of foodstuff and processed food
Vegetable processing Preservation of foodstuff,
factories
processed food and seasoning
HotelsRestaurants
Wedding halls
Funeral halls
Event halls
Golf courses
Ship restaurants
Railway restaurants
Noodle restaurants
Ramen shops
Steak houses
Hamburger shops
Sushi restaurants
Hospitals, homes for
elderly people
Preservation rooms
behind convenience
storesPreservation rooms
behind supermarkets
Food selling sectionsof department stores

Preservation of foodstuff andcooked foodGlass door type
Hotel bread container type
Constant temperature, high humidity type
Center-pillar-less type
Sandwich type
Drawer type
Quick freezing type
Drain water evaporation type

Preservation of noodle-stuff andfoodstuff
Preservation of foodstuff suchas meat, vegetables, etc.
Sandwich type
Preservation of sushi-stuff
Room rental

Refrigeration locker type

Preservation of foodstuff, foodto be sold or delivered

4. Transition of Energy Consumption Efficiency
After the 3rd Session of the Conference of the Parties to the United Nations
Framework Convention on Climate Change in 1997 (COP3), the electricity consumption
was greatly reduced thanks to the development of energy conservation technologies by
manufacturers.
To further promote energy conservation, high efficiency DC motors started to be used
for fan motors and the efficiency of compressors was enhanced by improving the-5-

processing accuracy of sliding parts in recent years. As a result, the energy conservationof typical models was improved by 20 to 40% in case of the vertical type and by 4 to 25%
in case of the horizontal type during the period between 2002 and 2007, and it was
further improved by 20 to 30% by the use of inverters.
Transition of Energy Consumption Efficiency

Inverter

Vertical
Refrigerators

VerticalFreezers

VerticalHorizontal
Refrigerator- Refrigerators
freezers

Horizontal
Freezers

Horizontal
Refrigerator-freezers(Note) Information Source: From the result of electricity consumption test implemented for typical models.
Estimation of the Japan Refrigeration and Air Conditioning Industry Association.

5. Technical Activities to Enhance Energy Conservation(1) Improvement of compressor’s efficiency
It is being tried to improve compressor motors of refrigerators by enhancing the
motor efficiency by adopting operation condensers, improving the motor efficiency byincreasing the motor core’s thickness, reducing the mechanical loss of the sliding
section by making the motor shaft smaller, enhancing the volume efficiency byminimizing the top clearance. Furthermore, additional improvement can be expectedby adopting the inverter motor the number of revolution of which can be changed, bychanging the AC motor to the DC motor, by changing the distributed winding to theconcentrated winding (direct winding) and so on.
(2) Technologies for improving the performance of fans
1) High-efficiency of fan motors in refrigerators
To change AC motors to DC brushless motors with high efficiency.
2) Improvement of efficiency of condenser’s fan motors
It is being tried to make the efficiency of condenser’s fan motors high byimproving the fan shape to make the air amount greater while containing thenoise. As regards motors, it is expected that improvement can be made byenhancing the motor efficiency by adopting condenser motors and high efficiency
DC motors.
-6-(3) Technologies for improving efficiency of control
1) Control of dew condensation prevention heaters
It is possible to improve the efficiency of dew condensation prevention heaters
around doors with the micro-computer control by changing the control from theway which always supplies electricity to the way which controls the optimal
electricity supply ratio.
2) Control of the number of revolution of compressor motors (using the inverter)
Improvement is realized by changing the AC motor to the high efficiency DC
motor and by controlling the number of revolution with the micro computer.
6. Measures to Be Taken and Issues to Be Solved for Energy Conservation Hereafter
Energy conservation technologies relating to commercial refrigerators, etc. basicallyconcern the improvement in three fields, i.e. cooling technologies, thermal insulation
technologies and control technologies.
So far, improvement and innovation have been made to compressor structure, fanmotors and thermal insulation structure and main energy conservation technologies havealready been incorporated in products, so it seems that the promotion of those energy
conservation technologies will be the core of the energy conservation activities from nowon.
The followings are some of the examples conceived as specific energy conservation
activities in the future.
(1) Application of new high-tech technologies (optimal control of inverter control)(2) Study and application of new thermal insulation material (vacuum thermal insulationmaterial, etc.)(3) Review of the energy conservation technologies implemented in the past andpromotion of further improvement(4) Efficiency improvement by changing refrigerant
7. Transition of Energy Conservation Technologies
Compressors

Condensers

87-96- High efficiency- Adoption of rotarycompressors- Large models- Improvement ofefficiency

97

98

99

00

01

02
03
04
・
Introduction of highefficiency compressors

05

06
07
・
Adoption of
inverters

Evaporators

・
Improvement of
evaporation efficiency

Defrosting
Heaters

・Electricity
conservation

Doors

Fan motors
insiderefrigerators
Condenser
Fan Motors

・
Optimization by thecontrol of door frame- Improvement of airlayer of gaskets
・Intermittent operation of fans inside
refrigerators (horizontal type)

・
Revolution control
Adoption of DC motors

・

Change from magnetic pole induction
motors to condenser-run-motors-7-・

Adoption of
DC motors

Control・
Input reduction when defrosting(glass tube heaters, horizontal type)- Micro computer control

Others- U trap drain

Heaters-8-