Beijing
Energy Savings % Indoor Vs. Window R/F
A/C is Off 
Excluding Summer Energy Savings
Definition of Columns in the table: 
B = Average Outdoor temperature (temperature of Window R/F's Condenser).   
C = Average Indoor temperature, 70 F or higher (temperature of Indoor R/F's Condenser). 
D = Average temperature inside the R/F (set constant at 29 F). 
Ti = C - D = Temperature difference between the Indoor R/F's evaporator and condenser. 
Tw = B - D = Temperature difference between the Window R/F's evaporator and condenser.  
G = Energy Savings % assuming that both R/Fs have the same COP (efficiency).  
G = (Ti - Tw) / Ti   Unlike Column H, it does not include the higher efficiency of  window R/F. 
H = Energy Savings % taking into account the higher COP (efficiency) of the window R/F. 
H = 1 - (Tw x Tw) / (Ti x Ti)  Unlike column G, it includes the higher efficiency of window R/F. 
Fahrenheit B C D Ti Tw G H
JAN 25 70 29 41 -4 95% 95%
FEB 33 70 29 41 4 90% 95%
MAR 44 70 29 41 15 63% 87%
APR 58 70 29 41 29 29% 50%
MAY 69 70 29 41 40 2% 5%
JUN 77 77 29 48 48 0% 0%
JUL 80 80 29 51 51 0% 0%
AUG 77 77 29 48 48 0% 0%
SEP 68 70 29 41 39 5% 10%
OCT 56 70 29 41 27 34% 57%
NOV 41 70 29 41 12 71% 91%
DEC 30 70 29 41 1 95% 95%
Average Energy Savings %      40% 49%
Exact same as above except in Celsius
Celsius B C D Ti Tw G H
JAN -4 21 -2 23 -2 95% 95%
FEB 1 21 -2 23 2 90% 95%
MAR 7 21 -2 23 8 63% 87%
APR 14 21 -2 23 16 29% 50%
MAY 21 21 -2 23 22 2% 5%
JUN 25 25 -2 27 27 0% 0%
JUL 27 27 -2 28 28 0% 0%
AUG 25 25 -2 27 27 0% 0%
SEP 20 21 -2 23 22 5% 10%
OCT 13 21 -2 23 15 34% 57%
NOV 5 21 -2 23 7 71% 91%
DEC -1 21 -2 23 1 95% 95%
Average Energy Savings %      40% 49%
Exact same as above except in Kelvin
Kelvin B C D Ti Tw G H
JAN 269 294 271 23 -2 95% 95%
FEB 274 294 271 23 2 90% 95%
MAR 280 294 271 23 8 63% 87%
APR 287 294 271 23 16 29% 50%
MAY 294 294 271 23 22 2% 5%
JUN 298 298 271 27 27 0% 0%
JUL 300 300 271 28 28 0% 0%
AUG 298 298 271 27 27 0% 0%
SEP 293 294 271 23 22 5% 10%
OCT 286 294 271 23 15 34% 57%
NOV 278 294 271 23 7 71% 91%
DEC 272 294 271 23 1 95% 95%
Average Energy Savings %      40% 49%
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