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Federal Register / Vol. 86, No. 58 / Monday, March 29, 2021 / Rules and Regulations
AECcool = 0.75 Pcool
AECcool = single-speed room air conditioner annual energy consumption in cooling mode, in kWh/year.
Pcool = single-speed room air conditioner average power in cooling mode, in watts, determined in section 4.1.2 of this appendix.

Where:

Capacity
CEER

Where:
CEER = combined energy efficiency ratio, in Btu/Wh.
Capacity = single-speed room air conditioner cooling capacity, in Btu/h, determined in section 4.1.2 of this appendix.
AECcool = single-speed room air conditioner annual energy consumption in cooling mode, in kWh/year, calculated in section 5.2.1 of this appendix.
AECia/om = annual energy consumption in inactive mode or off mode, in kWh/year, calculated in section 5.1 of this appendix.
0.75 as defined in section 5.2.1 of this appendix.
5.3 Combined energy efficiency ratio for variable-speed room air conditioners.
Calculate the combined energy efficiency ratio for variable-speed room air conditioners as follows:
5.3.1 Weighted electrical power input.
Calculate the weighted electrical power input in cooling mode, Pwt, expressed in watts, as follows:
Pwt = Stc Ptc Wtc Where:
Pwt = weighted electrical power input, in watts, in cooling mode.
Ptc = electrical power input, in watts, in cooling mode for each test condition in Table 1 of this appendix.
Wtc = weighting factors for each cooling mode test condition: 0.08 for test condition 1, 0.20 for test condition 2, 0.33 for test condition 3, and 0.39 for test condition 4. tc represents the cooling mode test condition: 1 for test condition 1 95 F condenser inlet drybulb temperature, 2 for test condition 2 92 F, 3 for test condition 3 87 F, and 4 for test condition 4 82 F.
5.3.2 Theoretical comparable singlespeed room air conditioner. Calculate the cooling capacity, expressed in Btu/h, and the electrical power input, expressed in watts, for a theoretical comparable single-speed room air conditioner at all cooling mode test conditions.
Capacityss_tc = Capacity1 1 + Mc
95Ttc Pss_tc = P1 1Mp 95Ttc Where:
Capacityss_tc = theoretical comparable singlespeed room air conditioner cooling
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= IAECcool +

AECia/om 0.75

5.3.3 Variable-speed room air conditioner units annual energy consumption for cooling mode at each cooling mode test condition.
Calculate the annual energy consumption for cooling mode under each test condition, AECtc, expressed in kilowatt-hours per year kWh/year, as follows:
AECtc = 0.75 Ptc Where:
AECtc = variable-speed room air conditioner units annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix.
Ptc = as defined in section 5.3.1 of this appendix.
0.75 as defined in section 5.2.1 of this appendix.
tc as explained in section 5.3.1 of this appendix.
5.3.4 Variable-speed room air conditioner weighted annual energy consumption.
Calculate the weighted annual energy consumption in cooling mode for a variable-

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5.2.2 Single-speed room air conditioner combined energy efficiency ratio. Calculate the combined energy efficiency ratio, CEER, expressed in Btu/Wh, as follows:

1

capacity, in Btu/h, calculated for each of the cooling mode test conditions in Table 1 of this appendix.
Capacity1 = variable-speed room air conditioner units cooling capacity, in Btu/h, determined in section 4.1.2 of this appendix for test condition 1 in Table 1
of this appendix.
Pss_tc = theoretical comparable single-speed room air conditioner electrical power input, in watts, calculated for each of the cooling mode test conditions in Table 1
of this appendix.
P1 = variable-speed room air conditioner units electrical power input, in watts, determined in section 4.1.2 of this appendix for test condition 1 in Table 1
of this appendix.
Mc = adjustment factor to determine the increased capacity at lower outdoor test conditions, 0.0099 per F.
Mp = adjustment factor to determine the reduced electrical power input at lower outdoor test conditions, 0.0076 per F.
95 is the condenser inlet dry-bulb temperature for test condition 1 in Table 1 of this appendix, 95 F.
Ttc = condenser inlet dry-bulb temperature for each of the test conditions in Table 1 of this appendix in F.
tc as explained in section 5.3.1 of this appendix.

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0.75 is 750 annual operating hours in cooling mode multiplied by a 0.001 kWh/Wh conversion factor from watt-hours to kilowatt-hours.

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speed room air conditioner, AECwt, expressed in kWh/year.
AECwt = Stc AECtc Wtc Where:
AECwt = weighted annual energy consumption in cooling mode for a variable-speed room air conditioner, expressed in kWh/year.
AECtc = variable-speed room air conditioner units annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix, determined in section 5.3.3 of this appendix.
Wtc = weighting factors for each cooling mode test condition: 0.08 for test condition 1, 0.20 for test condition 2, 0.33 for test condition 3, and 0.39 for test condition 4.
tc as explained in section 5.3.1 of this appendix.
5.3.5 Theoretical comparable singlespeed room air conditioner annual energy consumption in cooling mode at each cooling mode test condition. Calculate the annual energy consumption in cooling mode for a theoretical comparable single-speed room air conditioner for cooling mode under each test condition, AECss_tc, expressed in kWh/year.
AECss_tc = 0.75 Pss_tc Where:
AECss_tc = theoretical comparable singlespeed room air conditioner annual energy consumption, in kWh/year, in cooling mode for each test condition in Table 1 of this appendix.
Pss_tc = theoretical comparable single-speed room air conditioner electrical power input, in watts, in cooling mode for each test condition in Table 1 of this appendix, determined in section 5.3.2 of this appendix.
0.75 as defined in section 5.2.1 of this appendix.
tc as explained in section 5.3.1 of this appendix.
5.3.6 Variable-speed room air conditioner combined energy efficiency ratio at each cooling mode test condition. Calculate the variable-speed room air conditioner units combined energy efficiency ratio, CEERtc, for each test condition, expressed in Btu/Wh.

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5.2.1 Single-speed room air conditioner annual energy consumption in cooling mode.
Calculate the annual energy consumption in cooling mode for a single-speed room air conditioner, AECcool, expressed in kWh/year.

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