Federal Register - March 29, 2021
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Source: Federal Register
16480
CEERtc
Federal Register / Vol. 86, No. 58 / Monday, March 29, 2021 / Rules and Regulations
=
CapacitYtc AECtc + AECia/om 0.75
Where:
CEERtc = variable-speed room air conditioner units combined energy efficiency ratio, in Btu/Wh, for each test condition in Table 1 of this appendix.
Capacitytc = variable-speed room air conditioner units cooling capacity, in
Btu/h, for each test condition in Table 1
of this appendix, determined in section 4.1.2 of this appendix.
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.
AECia/om = annual energy consumption in inactive mode of off mode, in kWh/year, determined in section 5.1 of this appendix.
CEERss_tc
=
0.75 as defined in section 5.2.1 of this appendix.
tc as explained in section 5.3.1 of this appendix.
5.3.7 Theoretical comparable singlespeed room air conditioner combined energy efficiency ratio. Calculate the combined energy efficiency ratio for a theoretical comparable single-speed room air conditioner, CEERss_tc, for each test condition, expressed in Btu/Wh.
CapacitYss tc AECss tc + AECia/om 0.75
5.3.8 Theoretical comparable singlespeed room air conditioner adjusted combined energy efficiency ratio. Calculate the adjusted combined energy efficiency ratio, for a theoretical comparable singlespeed room air conditioner, CEERss_tc_adj, with cycling losses considered, for each test condition, expressed in Btu/Wh.
CEERss_tc_adj = CEERss_tc CLFtc
5.3.9 Weighted combined energy efficiency ratio. Calculate the weighted combined energy efficiency ratio for the variable-speed room air conditioner unit, CEERwt, and theoretical comparable singlespeed room air conditioner, CEERss_wt, expressed in Btu/Wh.
CEERwt = Stc CEERtc Wtc CEERss_wt = Stc CEERss_tc_adj Wtc Where:
CEERwt = variable-speed room air conditioner units weighted combined energy efficiency ratio, in Btu/Wh.
CEERss_wt = theoretical comparable singlespeed room air conditioner weighted combined energy efficiency ratio, in Btu/
Wh.
CEERtc = variable-speed room air conditioner units combined energy efficiency ratio, in Btu/Wh, at each test condition in Table 1 of this appendix, determined in section 5.3.6 of this appendix.
CEERss_tc_adj = theoretical comparable singlespeed room air conditioner adjusted combined energy efficiency ratio, in Btu/
Wh, at each test condition in Table 1 of this appendix, determined in section 5.3.8 of this appendix.
Wtc as defined in section 5.3.4 of this appendix.
tc as explained in section 5.3.1 of this appendix.
5.3.10 Variable-speed room air conditioner performance adjustment factor.
Calculate the variable-speed room air conditioner units performance adjustment factor, Fp.
F. P -
CEERwt - CEERss_wt CEERss_wt
Where:
Fp = variable-speed room air conditioner units performance adjustment factor.
CEERwt = variable-speed room air conditioner units weighted combined energy efficiency ratio, in Btu/Wh, determined in section 5.3.9 of this appendix.
CEERss_wt = theoretical comparable singlespeed room air conditioner weighted combined energy efficiency ratio, in Btu/
Wh, determined in section 5.3.9 of this appendix.
5.3.11 Variable-speed room air conditioner combined energy efficiency ratio.
Calculate the combined energy efficiency ratio, CEER, expressed in Btu/Wh, for variable-speed air conditioners.
CEER = CEER1 1 + Fp Where:
CEER = combined energy efficiency ratio, in Btu/Wh.
CEER1 = variable-speed room air conditioner combined energy efficiency ratio for test condition 1 in Table 1 of this appendix, in Btu/Wh, determined in section 5.3.6
of this appendix.
Fp = variable-speed room air conditioner performance adjustment factor, determined in section 5.3.10 of this appendix.
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ER29MR21.003
ER29MR21.004
Where:
CEERss_tc_adj = theoretical comparable singlespeed room air conditioner adjusted combined energy efficiency ratio, in Btu/
Wh, for each test condition in Table 1 of this appendix.
CEERss_tc = theoretical comparable singlespeed room air conditioner combined
energy efficiency ratio, in Btu/Wh, for each test condition in Table 1 of this appendix, determined in section 5.3.7 of this appendix.
CLFtc = cycling loss factor for each test condition; 1 for test condition 1, 0.956
for test condition 2, 0.883 for test condition 3, and 0.810 for test condition 4.
tc as explained in section 5.3.1 of this appendix.
ER29MR21.005
Where:
CEERss_tc = theoretical comparable singlespeed room air conditioner combined energy efficiency ratio, in Btu/Wh, for each test condition in Table 1 of this appendix.
Capacityss_tc = theoretical comparable singlespeed room air conditioner cooling capacity, in Btu/h, for each test condition in Table 1 of this appendix, determined in section 5.3.2 of this appendix.
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, determined in section 5.3.5 of this appendix.
AECia/om = annual energy consumption in inactive mode or off mode, in kWh/year, determined in section 5.1 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.
