Seasonal Efficiency Concept
for Middle East

Kazuhiro Sato
JRAIA (the Japan refrigeration and Air Conditioning Industry Association)

2Introduction• Most of developed countries have employed or isemploying seasonal efficiency or equivalent one.
• From the global efficiency point of view, the launchof seasonal efficiency in the countries in the Middle
East the tropical area is highly desirable.
• However, the simple copy of the currently existing
one in the developed countries is not appropriate
and some modification or adjustment is needed byconsidering the higher ambient temperature.
• The technical approach and some suggestions will bepresented.

3

Activity: Harmonisation in ASEAN countries
ASEAN situation (Image for easier understanding)Country A

Country B

Country C

Country D

Testing
MethodISO51511994

ISO5151-1994

ISO5151-2010
ISO15042-2011

ISO5151-2010

Performance
Evaluation
Criteria

All type

Fixed
cap.

Inverter

Fixed
cap.

Inverter

Fixed
cap.

Inverter

Performance
Evaluation
Criteria

EER (COP)

EER
(COP)

Weighted
EER (COP)

EER
(COP)

EER(COP) /Weighted
EER(COP)

EER
(COP)

CSPF

5.5

4.86/5.5

3.4

3.8

Labelling Level 5 3.22

MEPS Level

4 3.10

3.05

3.76

4.86

4.29/4.86

3.2

3.6

3 2.82

2.92

3.34

4.29

3.78/4.29

3.0

3.4

2

2.64

2.92

3.34/3.78

2.8

3.2

1

2.5

2.64

3.06/3.34

2.6

3.0

-

3.34

3.06/3.34

2.6

3.0

2.82

-

4

Proposal on the Step of Harmonisation
Phase 1
1st Step

Phase 2
2nd Step

3rd Step

4th Step

Harmonisationof Testing
MethodHarmonisationof Performance
Evaluation

Harmonizationof Labellingvalue

Harmonizationof MEPS value

ISO5151-1994 or
ISO5151-2010

EER or
Weighted EER
or CSPF1, 2, 3, 4, 5
2.6,2.8,3.0,3.2.3.4 or
2.6,2,9,3.2,3.5,3.8 or
3.3,3.8,4.3,4.9,5.5

Rank 1 value or
Rank 2 value or
Certain value

Testing method
has been agreed
to harmonize toISO5151-2010

The work forharmonization
to CSPF shall bestarted

Labelling levelvalue
Harmonization

MEPS value
Harmonization

Middle East climate vs. SEER standards
500

Abu Dhabi
Riyadh
Kuwait
AHRI
ISO

450
400
350
Hours

300
250
200
150
100
5000

1020304050 °C

Either AHRI or ISO reference is not very appropriate for Middle East.
 Seasonal efficiency conditions based on middle east climate
should be established according to ISO16358.

EER

System design and evaluation
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
25.0

30.0

35.0

40.0
45.0
50.0
Ambient Temp(°C)

The right application of standard will lead to the right evaluationand the right direction of design.
• SEER with current ISO reference conditions: Blue > Red• Middle East conditions: Red > Blue

Difference in weighting
Weight in SEER(%)

ISO reference vs. Middle East conditions
1614121086
420
20ISO ReferenceMiddle-east (Riyadh)

253035404550
Ambient Temp(°C)

In the current ISO reference, the efficiency in 25-30 °C ambientcondition has major impact, but 30-40 °C range is important inMiddle East condition.
 Optimisation of AC design based on the reference byconsidering the climate will lead to high efficiency in Middle East.

Seasonal efficiency for Middle East
Example of proposal from the practical point of view

• T3 condition for 100% load
• T1 condition for 50%• 29°C ambient for 25%• Hours for each temperature should bechosen from a representative city or
determined from the average of several
representative cities.

Effect of load ratio: variable speed is promising

EERLoad(%)

100

0 20EERvariable speed

00

3550
Ambient Temp(°C)
20
constant speed

3550
Ambient Temp(°C)

Load(%) 100

Variable speed technology has high potential for energy
efficiency in Middle East.

Conclusions and suggestions• Seasonal Efficiency standard for Middle East
should be established, ASAP. The establishment
according to ISO16358 by considering the higher
ambient temperature is suggested.
• The standard by considering the climate correctly
will lead to the high efficiency in Middle East.
• The early launch of MEPS in SEER will
accelerate the efficiency improvement in Middle
East.
• The technology of variable speed compressors
and fans has the high potential in near future.

Seasonal Efficiency Concept for Middle-east

Thank you for your kind attention.