1 | Building Technologies Program eere.energy.gov The Parker Ranch installation in Hawaii 

### BUILDING TECHNOLOGIES PROGRAM



### Notice of Proposed Rulemaking Public Meeting: Microwave Oven (Active Mode) Test Procedure March 5, 2013 Ashley Armstrong Department of Energy Energy Efficiency & Renewable Energy2 | Building Technologies Program eere.energy.gov 4 3 2

Test Methods for Microwave - Only Ovens Covered Products Consumer Usage 1 Introduction and Regulatory History

5 Test Methods for Convection Microwave Ovens 

## Public Meeting Agenda

6 Measures of Energy Consumption
7 Compliance with EPCA Requirements3 | Building Technologies Program eere.energy.gov  NOPR published on February 4, 2013  NOPR Public Meeting today, March 5, 2013  Comments on NOPR from interested parties

• Transcript records oral comments from today’s public meeting

• Written comments (comment period closes April 22, 2013)  DOE reviews and considers all comments  Final Rule Publication 

### Steps in the Test Procedure Rulemaking 

## Introduction

Final Rule NOPR4 | Building Technologies Program eere.energy.gov 

## Legislative Background
 Test Procedure Final Rule. 62 FR 51976, Oct. 3, 1997.

• Established microwave oven active mode test procedures in 10 CFR part 430, subpart B, appendix I.

• Incorporated by reference IEC Standard 705

– Second Edition 1998 and Amendment 2

– 1993, “Methods for Measuring the Performance of Microwave Ovens for Households and Similar Purposes.”  Test Procedure Repeal Final Rule. 75 FR 42579, July 22, 2010.

• Repealed the microwave oven active mode test procedure.

• DOE determined that the existing test procedure did not produce representative and repeatable test results

. • DOE was unaware of any test procedures that addressed the concerns with the cooking efficiency test procedure. 

## Regulatory History5 | Building Technologies Program eere.energy.gov 

## Legislative Background
 Notice of Public Meeting. 75 FR 42611, July 22, 2010.

• Initiated a rulemaking to address active mode test procedures.

• DOE received no data or comments suggesting potential testing methods for microwave oven active mode.  Request for Information Notice. 76 FR 65631, Oct. 24, 2011.

• Sought information and comments regarding representative and repeatable methods for measuring the microwave
- only and convection
microwave cooking mode energy use.

• Interested parties comments:

- Real and artificial food loads do not produce repeatable and reproducible results.

- Interested parties commented that DOE should harmonize with IEC Standard 60705. 

## Regulatory History6 | Building Technologies Program eere.energy.gov 

## Legislative Background
 Notice of Data Availability. 77 FR 33106, June 5, 2012.

• Presented test results and analytical approaches that DOE was considering for potential amendments.

• Considered microwave
- only, convection
- only, and convection
microwave cooking modes.

• Requested comment and information on test results. 

## Regulatory History7 | Building Technologies Program eere.energy.gov 4 3 2

Test Methods for Microwave - Only Ovens Covered Products Consumer Usage 1 Introduction and Regulatory History

5 Test Methods for Convection Microwave Ovens 

## Public Meeting Agenda

6 Measures of Energy Consumption
7 Compliance with EPCA Requirements8 | Building Technologies Program eere.energy.gov 

## Test Procedure Applicability
 10 CFR 430.2 provides the following definition:

• Microwave oven means a class of kitchen ranges and ovens which is a household cooking appliance consisting of a compartment designed to cook or heat food by means of microwave energy , including microwave ovens with or without thermal elements designed for surface browning of food and convection microwave ovens.  Includes all ovens equipped with microwave capability, including convection microwave ovens.  January 2013 TP Final Rule (standby/off mode) adopted a definition of convection microwave oven.

• Microwave oven that incorporates microwave capability, convection features, and any other cooking means in a single compartment

. 

## Covered Products9 | Building Technologies Program eere.energy.gov 

## Test Procedure Applicability
 All products that combine a microwave oven with other appliance functionality would be considered covered products.

• Microwave/conventional ranges, microwave/conventional ovens, microwave/conventional cooking tops, and other combined products.  DOE proposes not to require such “combined products” be tested according to the proposed amendments.

• Lack of information regarding appropriate testing methods and proper apportionment of energy use between the different functional components of the combined products

. 

## Covered Products10 | Building Technologies Program eere.energy.gov 4 3 2

Test Methods for Microwave - Only Ovens Covered Products Consumer Usage 1 Introduction and Regulatory History

5 Test Methods for Convection Microwave Ovens 

## Public Meeting Agenda

6 Measures of Energy Consumption
7 Compliance with EPCA Requirements11 | Building Technologies Program eere.energy.gov 

## Consumer Usage Survey Data
 Lawrence Berkeley National Laboratory conducted a consumer usage survey in 2012 for microwave ovens.

• Collected data for microwave
- only ovens (2258 households) and convection microwave ovens (653 households). 

## Consumer Usage

Product Mode Cycle Length

( **min**) Number of Annual Cycles Annual Hours ( **min**) Microwave
- Only Oven Microwave
- Only 2.62 1026 44.9
Convection Microwave Oven Microwave
- Only 2.54 842 35.7 Convection
- Only 18.70 101 31.7 Convection
- Microwave 15.00 69 17.312 | Building Technologies Program eere.energy.gov 4 3 2

Test Methods for Microwave - Only Ovens Covered Products Consumer Usage 1 Introduction and Regulatory History

5 Test Methods for Convection Microwave Ovens 

## Public Meeting Agenda

6 Measures of Energy Consumption
7 Compliance with EPCA Requirements13 | Building Technologies Program eere.energy.gov 

## Previous DOE Microwave Oven Test Procedure
 Previous DOE test procedure incorporated by reference IEC Standard 705 for measuring active mode energy use.

• Measured the amount of energy required to raise the temperature of 1 kg of water by 10 ° C under controlled conditions.

• The ratio of usable output power over input power described the energy factor (EF), a measure of the cooking efficiency. 

## Microwave
- Only Ovens14 | Building Technologies Program eere.energy.gov 

## IEC Standard 60705
 IEC published an updated version, IEC Standard 60705 – Edition 4.0 2010 – 04.

• Maintained the same basic testing methods as IEC Standard 705.  IEC is in the process of revising its current test standard for microwave ovens, IEC Standard 60705.

• Latest draft version of IEC Standard 60705 was dated November 25, 2011. 

## Microwave
- Only Ovens15 | Building Technologies Program eere.energy.gov 

## IEC Standard 60705 Test Method
 Draft revised IEC Standard 60705 includes a new test method that continues to use water as the cooking load
.

• Measures the energy consumption required to heat water loads of 275 g, 350 g, and 1000 g, in 600 ml, 900 ml, and 2000 ml borosilicate glass test containers, respectively, by 45

– 50 ° C and 50

– 55 ° C.

• The results for each load size are used to linearly interpolate the energy consumption required to heat the load by 50 ° C.

• The cooking cycle energy consumption for each water load size is weighted based on consumer usage to calculate an average weighted per - cycle cooking energy consumption (2 75 g = 3/11; 350 g = 6/11; 1000 g = 2/11). 

## Microwave
- Only Ovens16 | Building Technologies Program eere.energy.gov 

## IEC Standard 60705 Test Method
 Draft revised IEC Standard 60705 includes test methods for measuring the cooling down energy consumption.

• 15
- minute measurement period after the completion of a 50 ° C water load temperature rise cooking cycle.

• Designed to measure the energy consumption associated with ventilating the microwave oven ( i.e. , operation of a fan) to cool down the cavity.

• Included as an informative annex not required to be conducted. 

## Microwave
- Only Ovens17 | Building Technologies Program eere.energy.gov 

## June 2012 NODA Test Results
 DOE presented results from testing to evaluate the repeatability of the draft revised IEC Standard 60705 cooking cycle test methods. 

## Microwave
- Only Ovens

Draft Revised IEC Standard 60705 Cooking Cycle Test 275 g Water Load 350 g Water Load 1000 g Water Load Overall Weighted Energy Consumption ( Wh ) Average 37.99 44.34 114.90 56.11 Min 32.54 39.14 104.86 50.35 Max 46.61 54.68 130.87 66.54 Test
- to - Test Variation

– Standard Error ( % ) Average 1.08 1.06 0.44 0.58 Min 0.05 0.10 0.09 0.03 Max 2.31 2.59 0.78 1.2518 | Building Technologies Program eere.energy.gov 

## June 2012 NODA Test Results
 DOE conducted testing to evaluate the cooling down test method.

• Results showed minimal variation in the measured cooling down energy consumption from test to test and also between the different load sizes

. • For all test units, none contained a fan that operated at the end of the microwave
- only cooking cycle.

• When the door was closed after the load was removed at the end of the cooking cycle, the microwave ovens reverted back to the standby mode. 

## Microwave
- Only Ovens19 | Building Technologies Program eere.energy.gov 

## CENELEC Round - Robin Testing
 European Committee for Electrotechnical Standardization (CENELEC) conducted a round - robin testing program to evaluate the draft revised IEC Standard 60705.

• 5 manufacturer test labs and 5 independent test labs in Europe.

• 4 microwave oven models.  CENELEC determined that the repeatability and reproducibility for the measured weighted cooking cycle and cooling down energy consumption to be acceptable 

## Microwave
- Only Ovens

Mode Test - to - Test Variation ( **%** ) Lab - to - Lab Variation ( **%** ) Weighted Cooking Cycle Energy Consumption 0.56 2.30 Weighted Cooling Down Energy Consumption 0.24 6.1420 | Building Technologies Program eere.energy.gov 

## Proposed Test Method
 DOE proposes to include provisions for measuring the microwave only active mode energy use based on the November 2011 draft IEC Standard 60705.

• Test methods produce repeatable and reproducible results.  DOE also proposes additional language to clarify the application of these provisions. 

## Microwave
- Only Ovens21 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Definitions
 DOE proposes to define **over -**  **the -**  **range** as follows:

• The installation configuration for certain microwave ovens that are intended to be installed in the cabinetry above a conventional range or cooktop

. • Such products are supported by surrounding cabinetry, walls, or other similar structures on the sides, top, and/or rear of the product. 

## Microwave
- Only Ovens22 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Installation Conditions
 For over - the - range microwave ovens, products equipped with a fan designed to vent air out of the microwave oven cooking cavity offer two installation configurations :

• Vent fan exhausts air from the cooking cavity to the outdoors.

• Vent fan recirculates air from the cooking cavity back into room.  DOE proposes to require that over - the - range microwave ovens be installed with the exhaust vent/recirculation fan in the recirculation configuration.

• Default configuration for most products in DOE’s test sample.

• Minimizes burden by not requiring test room be capable of outdoor venting.

• Provide consistent method for all products. 

## Microwave
- Only Ovens23 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Setup
 November 2011 draft IEC Standard 60705 specifies that at the beginning of each test, the oven shall not have been operated for a period of at least 6 hours before each test.

• Temperature of the magnetron and power supply shall be within 2 ° C of the ambient temperature.

• Forced cooling may be used to assist in cooling the component temperatures to ambient conditions.  Appendix I specifies that all areas of the appliance shall attain the normal nonoperating temperature before any test.

• Defined as the temperature that the appliance would attain if it remained in the test room for 24 hours ± 2.8 ° C.  DOE is not proposing to amend the normal nonoperating temperature currently specified in appendix I. 

## Microwave
- Only Ovens24 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Insulating Pads
 November 2011 draft IEC Standard 60705 specifies that the water test load be placed on a thermally insulating pad when making temperature measurements .  DOE proposes to require the use of an insulating pad with a heat capacity of 1.30 kJ/kg - K or less, which is the heat capacity of polystyrene
.

• Effectively insulates water test load while making temperature measurements. 

## Microwave
- Only Ovens25 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Fan - Only Mode
 DOE proposes to measure the fan - only mode cooling down energy consumption only for products equipped with a fan that operates automatically at the completion of the cooking cycle.

• None of the microwave ovens in DOE’s test sample were equipped with a fan that operated at the end of the microwave
- only cooking cycle.

• May be microwave ovens on the market or future products that could potentially operate in fan
- only mode at the end of the microwave
- only cooking cycle.  DOE proposes to define fan - only mode as follows:

• A mode that is not user
- selectable and in which a fan circulates air internally or externally to the microwave oven for a finite period of time after the end of the cooking cycle. 

## Microwave
- Only Ovens26 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Fan - Only Mode
 DOE proposes to measure fan - only mode based on the provisions in the November 2011 draft IEC Standard 60705, with the following modification:

• Measure the fan
- only mode energy consumption and duration rather than for a fixed 15
- minute period.  DOE is not aware of the typical duration of fan - only mode operation after the microwave - only cooking cycle.

• November 2011 draft IEC Standard 60705 specifies that the test load should be removed from the microwave oven and the door closed within 30 ± 2 seconds after the completion of the cooking cycle.

• DOE recognizes that for a shorter cycle time, the duration of the fan
only mode may only be a short period of time. 

## Microwave
- Only Ovens27 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Repeat Tests
 November 2011 draft IEC Standard 60705 does not require multiple repeat test runs.  DOE believes requiring multiple repeat test runs will improve the accuracy of test results.

• DOE proposes to require that the full microwave
- only test series be repeated three times unless the total per - cycle energy consumption for the second measurement is within 1.5 percent of the value obtained from the first measurement. 

## Microwave
- Only Ovens28 | Building Technologies Program eere.energy.gov 

## Microwave - Only Oven Test Method 

## Microwave
- Only Ovens

Comment Request #1 DOE seeks comment on the proposal to measure the active mode energy use of the microwave - only cooking mode for microwave only ovens based on the provisions in the November 2011 draft IEC Standard 60705. DOE also seeks comment on the requirement to repeat the full microwave - only test series three times unless the total microwave - only per - cycle energy consumption for the second measurement is within 1.5 percent of the value obtained from the first measurement.29 | Building Technologies Program eere.energy.gov 

## Fan - Only Mode 

## Microwave
- Only Ovens

Comment Request #3 DOE seeks comment on the proposal to require that the microwave only fan - only mode be measured for only those products that are capable of operating in fan - only mode. DOE welcomes comment on the proposed requirement to measure the fan - only mode until the end of the fan - only mode, rather than for a fixed period of time. DOE also welcomes comment on whether the proposed requirement to close the microwave oven door within 30 ± 2 after the completion of the microwave - only cooking cycle is appropriate to accurately measure the microwave - only fan - only mode energy use.30 | Building Technologies Program eere.energy.gov 

## Food Simulation Mixture Test Loads
 For the June 2012 NODA, DOE conducted testing using the microwave - only cooking mode to evaluate mixtures that would simulate food loads that may be heated in a microwave
.

• Mixtures were composed of water and basic food ingredients ( i.e. , fats, sugars, salt, fiber, proteins, etc.) with a total combined mass of 350 g

. • Ingredients composing each mixture were based on nutritional labels of commonly microwaved foods.

• DOE also tested mixtures with only one or two key ingredients.  Test results showed a higher range and average test - to - test variation compared to the water - only test load.  DOE is not proposing to require the use of real or simulated food loads. 

## Microwave
- Only Ovens31 | Building Technologies Program eere.energy.gov 4 3 2

Test Methods for Microwave - Only Ovens Covered Products Consumer Usage 1 Introduction and Regulatory History

5 Test Methods for Convection Microwave Ovens 

## Public Meeting Agenda

6 Measures of Energy Consumption
7 Compliance with EPCA Requirements32 | Building Technologies Program eere.energy.gov 

## Convection Microwave Ovens
 Typically can be operated using the microwave - only cooking mode, convection - only cooking mode, and convection - microwave cooking mode
.  Convection microwave ovens represent a significant number of shipments and warrant separate test methods.

• ~4.1 percent of U.S. microwave oven shipments (~400,000 annual shipments).

• Total Annual Energy Consumption:

- Convection
- only cooking mode represents ~28.2 percent.

- Convection
- microwave cooking mode represents ~16.9 percent. 

## Convection Microwave Ovens33 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Microwave - Only Mode
 DOE proposes to measure the energy consumption of the microwave only cooking mode for convection microwave ovens using the test procedures described previously.

• Based on the November 2011 draft IEC Standard 60705, with added clarifications. 

## Convection Microwave Ovens

Comment Request #2 DOE seeks comment on the proposal to measure the active mode energy use of the microwave - only cooking mode for convection microwave ovens based on the provisions in the November 2011 draft IEC Standard 60705.34 | Building Technologies Program eere.energy.gov 

## Convection - Only Mode – June 2012 NODA
 For the June 2012 NODA, DOE developed a test method for the convection - only mode based on the DOE conventional oven test procedure.  DOE conventional oven test procedure:

• Temperature control for the convection cooking cycle is set such that the temperature inside the oven is 325 ± 5 ° F higher than the room ambient air temperature (77 ± 9 ° F).

• An 8.5 ± 0.1 pound cylindrical aluminum test block is heated from ambient room air temperature ± 4 ° F until the test block temperature has increased 234 ° F above its initial temperature

. • The measured energy consumption is used to calculate the cooking efficiency and energy factor. 

## Convection Microwave Ovens35 | Building Technologies Program eere.energy.gov 

## Convection - Only Mode – June 2012 NODA
 Cavity temperature requirement of 325 ± 5 ° F higher than the room ambient air temperature would result in a temperature setting close to 400 ° F.

• A number of convection microwave ovens on the U.S. market do not have a 400 ° F temperature setting, but all products that DOE surveyed have a 375 ° F temperature setting.  DOE modified the test method to conduct this testing using a temperature control setting of 375 ° F to heat the aluminum test block to 234 ° F above its initial temperature.  DOE specified that the aluminum test block be placed on the metal cooking rack provided by the manufacturer. 

## Convection Microwave Ovens36 | Building Technologies Program eere.energy.gov 

## Convection - Only Mode – June 2012 NODA
 Test results for the convection - only cooking cycle. 

## Convection Microwave Ovens

Convection - Only Cooking Cycle Cooking Efficiency ( % ) Average 9.06 Min 6.51 Max 12.42 Test
- to - Test Variation

– Standard Error ( % ) Average 1.30 Min 0.68 Max 2.1137 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Convection - Only Mode
 DOE proposes to measure the convection - only cooking mode energy consumption based on the test methods described previously, with additional clarifications.  DOE proposes to require that if the convection microwave oven allows for the turntable to be turned on or off, it shall be tested with the turntable turned on.

• Turntable is typically turned on by default, and as a result, is likely the most common configuration used by consumers. 

## Convection Microwave Ovens38 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Convection - Only Mode
 DOE proposes to require that the energy use and duration of the fan only mode be measured at the end of the convection - only cooking cycle until the completion of the fan - only mode.

• Based on DOE testing, the duration of the fan
- only mode was between 0 and 7 minutes.

• Added test time is minimal compared to the overall convection
- only cooking test cycle length. 

## Convection Microwave Ovens39 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Convection - Only Mode
 DOE proposes to calculate the convection - only cooking cycle energy consumption using the same basic calculations used for the conventional oven test procedure.

• Convection
- only cooking cycle and fan
- only mode energy consumption added together to calculate the convection
- only mode energy consumption.

• Field use factor (0.26) applied to the calculation of the convection
- only mode energy consumption to account for the typical consumer use.

- Average convection
- only cooking cycle length according to consumer use data (18.70 minutes) divided by the average measured test length for the units in DOE’s test sample (72.68 minutes). 

## Convection Microwave Ovens40 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Convection - Only Mode
 DOE proposes to require that the convection - only test be repeated three times unless the total convection - only per - cycle energy consumption for the second measurement is within 1.5 percent of the value obtained from the first measurement
.

• Improve the accuracy of test results. 

## Convection Microwave Ovens41 | Building Technologies Program eere.energy.gov 

## Convection Microwave Oven – Convection - Only Mode 

## Convection Microwave Ovens

Comment Request #2 DOE seeks comment on the proposal to measure the active mode energy use of the convection - only cooking mode for convection microwave ovens based on the provisions in the DOE conventional oven test procedure in 10 CFR part 430, subpart B, appendix I, with additional modifications specific for microwave ovens. DOE also seeks comment on the requirement to repeat the convection - only test three times unless the total convection - only per - cycle energy consumption for the second measurement is within 1.5 percent of the value obtained from the first measurement.42 | Building Technologies Program eere.energy.gov 

## Convection Microwave Oven – Fan - Only Mode 

## Convection Microwave Ovens

Comment Request #3 DOE seeks comment on the proposal to require that the convection only fan - only mode be measured for only those products that are capable of operating in fan - only mode. DOE welcomes comment on the proposed requirement to measure the fan - only mode until the end of the fan - only mode, rather than for a fixed period of time.43 | Building Technologies Program eere.energy.gov 

## Convection - Microwave Mode – June 2012 NODA
 In the June 2012 NODA, DOE presented test results to evaluate test loads and methods for measuring the energy use of the convection microwave cooking mode.

• Real food loads

– Crisco ® all
- vegetable shortening, Russet Burbank potatoes, and USDA grade A boneless chicken breasts.

• Simulation food loads

– TX
- 151 solidifying gel.  Test results for both real and simulation food loads showed high test to - test variation.  Lab - to - lab reproducibility would be difficult to maintain.  DOE is not proposing to require the use of real or simulated food loads for measuring the energy consumption of convection microwave ovens. 

## Convection Microwave Ovens44 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Convection - Microwave Mode
 DOE proposes to use the results from the microwave - only and convection - only cooking cycle tests to determine the convection microwave cooking cycle energy consumption.  DOE is proposing to apply a field use adjustment to both the per - cycle microwave - only and convection - only cooking energy consumption
.

• Based on the ratio of the convection
- microwave cooking cycle length to either the microwave
- only cycle length (15.00 / 2.54 = 5.91) or convection
- only cooking cycle length (15.00 / 18.70 = 0.80) based on consumer use data. 

## Convection Microwave Ovens45 | Building Technologies Program eere.energy.gov 

## Proposed Test Method – Convection - Microwave Mode
 Per - cycle convection - microwave cooking mode energy consumption would be calculated by apportioning the microwave - only cooking and convection - only cooking energy consumption.

• Based on the amount of time typical convection microwave ovens use each cooking mode during a convection
- microwave cooking cycle

. • Default convection
- microwave cooking mode program cycles between microwave
- only cooking and convection
- only cooking.  DOE proposes to use weighting factors of 30 percent for microwave only cooking and 70 percent for convection - only cooking.

• For a single cooking cycle, the microwave
- only cooking accounted for 30 percent of the cooking time and convection
- only cooking accounted for the remaining 70 percent of the total cooking time per
- cycle on average for all of DOE’s test units. 

## Convection Microwave Ovens46 | Building Technologies Program eere.energy.gov 

## Convection - Microwave Mode 

## Convection Microwave Ovens

Comment Request #2 DOE seeks comment on the proposed method for calculating the energy use of the convection - microwave cooking mode based on the test results from the microwave - only and convection - only tests.47 | Building Technologies Program eere.energy.gov 4 3 2

Test Methods for Microwave - Only Ovens Covered Products Consumer Usage 1 Introduction and Regulatory History

5 Test Methods for Convection Microwave Ovens 

## Public Meeting Agenda

6 Measures of Energy Consumption
7 Compliance with EPCA Requirements48 | Building Technologies Program eere.energy.gov 

## Estimates of Annual Consumer Use
 To develop an integrated metric that combines the active mode energy consumption of each possible cooking mode with the standby and off mode energy consumption, DOE evaluated the data from the consumer use survey conducted by LBNL.  Microwave - only Oven Annual Consumer Use: 

## Measures of Energy Consumption

Mode Cycle Length

( **min**) Number of Annual Cycles Annual Hours ( **hour** ) Average Power ( **W** ) Annual Energy Use ( **kWh** ) Microwave
- Only Cooking 2.62 1026 44.9 1582.7 71.063 Microwave
- Only Fan
Only Mode 0 0 0 0 0 Standby/Off
- - 8715.1 2.7 23.53149 | Building Technologies Program eere.energy.gov 

## Convection Microwave Oven Annual Consumer Use

* Estimates are based on a microwave oven that is capable of operating in fan - only mode. The average fan - only mode cycle length was determined based DOE’s testing. 

## Measures of Energy Consumption

Mode Cycle Length

( **min**) Number of Annual Cycles Annual Hours ( **hour** ) Average Power ( **W** ) Annual Energy Use ( **kWh** ) Microwave
- Only Cooking 2.54 842 35.7 1582.7 56.502 Convection
- Only Cooking 18.70 101 31.7 1299.4 41.191 Convection
- Microwave Cooking 15.00 69 17.3 1421.3 24.588 Microwave
- Only Fan
Only Mode 0 0 0 0 0 Convection
- Only Fan
Only Mode 1.10* 101 1.9 39.1 0.074 Convection
- Microwave Fan
- Only 0.88* 69 1.0 39.1 0.039 Standby/Off
- - 8672.4 2.7 23.41550 | Building Technologies Program eere.energy.gov 

## Annual Energy Use Calculation
 DOE proposes to use the estimates of consumer use for each operating mode to calculate the total annual energy consumption for both microwave - only ovens and convection - microwave ovens.  Microwave - only ovens: 1. Calculate the product of the total weighted microwave
- only per
- cycle energy consumption and the number of annual microwave
- only cooking cycles for microwave
- only ovens. 2. Calculate the products of the average standby and off mode power and the allocated annual hours for each respective mode ; 3. Sum these results; and 4. Multiply the sum by 0.001 to convert from Wh to kWh. 

## Measures of Energy Consumption51 | Building Technologies Program eere.energy.gov 

## Annual Energy Use Calculation
 Convection microwave ovens: 1. Calculate the products of the microwave
- only mode, convection
- only mode, and convection
- microwave mode per
- cycle energy consumption and the number of annual cooking cycles for each mode for convection microwave ovens; 2. Calculate the products of the average standby and off mode power and the allocated annual hours for each respective mode ; 3. Sum these results; and 4. Multiply the sum by 0.001 to convert from Wh to kWh. 

## Measures of Energy Consumption52 | Building Technologies Program eere.energy.gov 

## Standby and Off Mode Hours
 Total standby and off mode hours:

• Number of total hours in a year (8760) minus the average cooking cycle times based on consumer use and the measured fan
- only mode times for each cooking mode.  Split between standby and off mode hours:

• DOE is unaware of any microwave ovens capable of operating in both standby mode and off mode.

• DOE proposes to split the total hours evenly between standby and off modes for products capable of functioning in both modes. 

## Measures of Energy Consumption53 | Building Technologies Program eere.energy.gov 

## Convection - Only Fan - Only Mode Hours
 DOE proposes to scale the measured convection - only fan - only mode time using the convection - only cooking cycle length field use factor (0.26).

• The convection
- only fan
- only mode time measured under the proposed test procedure would be based on a longer cooking cycle. 

## Measures of Energy Consumption54 | Building Technologies Program eere.energy.gov 

## Convection - Microwave Mode Fan - Only Mode Hours
 DOE believes that the fan - only mode time would likely be equivalent for a convection - only cooking and convection - microwave cooking cycle of the same length
.

• Microwave ovens that operate in fan
- only mode after the convection
only cooking cycle also operate in fan
- only mode after the convection
microwave cooking cycle.

• The fan
- only mode duration is based on either the cavity temperature or a fixed time based on the cooking cycle length.  DOE proposes to use the convection - only fan - only mode time, but scaled by the difference between the average convection - microwave cooking and convection - only cooking cycle lengths based on the consumer use data ( 15.00 min / 18.70 min). 

## Measures of Energy Consumption55 | Building Technologies Program eere.energy.gov 

## Integrated Annual Energy Use Metric 

## Active Mode Test Procedure

Comment Request #4 DOE seeks comment on the proposal to establish an integrated annual energy use metric. DOE specifically seeks comment and additional data on the consumer usage habits for each operating mode for both microwave - only ovens and convection microwave ovens to supplement the data from the LBNL consumer use survey.56 | Building Technologies Program eere.energy.gov 4 3 2

Test Methods for Microwave - Only Ovens Covered Products Consumer Usage 1 Introduction and Regulatory History

5 Test Methods for Convection Microwave Ovens 

## Public Meeting Agenda

6 Measures of Energy Consumption
7 Compliance with EPCA Requirements57 | Building Technologies Program eere.energy.gov 

## Test Burden
 Microwave - only mode:

• Similar test equipment cost to previous DOE test procedure.

• Two additional sized test container (600 ml and 900 ml).

• One
- time investment for test equipment of ~$3,000 ($300 more than previous DOE test procedure).

• Labor for testing a single model would cost between $3,000 and $4,200, depending on the number of repeat tests required ($2,600 to $3,600 more than the labor for the previous DOE test procedure). 

## Compliance with EPCA Requirements58 | Building Technologies Program eere.energy.gov 

## Test Burden
 Convection - only Mode:

• Similar requirements to DOE conventional oven test procedure.

• One
- time investment for test equipment would add $400.

• Labor for testing a single model would cost between $600 and $850, depending on the number of repeat tests required.  DOE does not expect these cost or time commitments to represent a significant burden.  DOE tentatively concludes that the proposed amended test procedures would not be unduly burdensome to conduct. 

## Compliance with EPCA Requirements59 | Building Technologies Program eere.energy.gov 

## Test Burden 

## Compliance with EPCA Requirements

Comment Request #5 DOE welcomes comment on the testing burden associated with the proposed amendments, in particular for the microwave - only and convection - only test methods. When providing comments, please quantify and describe the associated testing burdens (in terms of cost and time).60 | Building Technologies Program eere.energy.gov In all correspondence, please refer to the Microwave Oven (Active Mode) Test Procedure rulemaking by:

– Test Procedure NOPR for Microwave Ovens (Active Mode)

– Docket Number EERE
- 2010
- BT
- TP
- 0023

– Regulatory Identification Number (RIN) 1904
- AC26 Email : MWO
- 2010
- TP
- 0023@ee.doe.gov Postal Mail : Ms. Brenda Jones, U.S . Department of Energy Building Technologies Program, Mailstop EE
- 2J 1000 Independence Avenue, SW Washington, DC 20585
- 0121 Courier : Ms . Brenda Jones, U.S . Department of Energy Building Technologies Program 950 L’Enfant Plaza , SW., Suite 600 Washington , DC, 20024. Telephone: (202) 586
- 2945 Comment period closes April 22, 2013 

### How to Submit Written Comments 

## Closing Remarks