Kabul
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 30 70 29 41 1 95% 95%
FEB 33 70 29 41 4 90% 95%
MAR 45 70 29 41 16 61% 85%
APR 57 70 29 41 28 32% 53%
MAY 64 70 29 41 35 15% 27%
JUN 73 73 29 44 44 0% 0%
JUL 78 78 29 49 49 0% 0%
AUG 76 76 29 47 47 0% 0%
SEP 69 70 29 41 40 2% 5%
OCT 57 70 29 41 28 32% 53%
NOV 46 70 29 41 17 59% 83%
DEC 36 70 29 41 7 83% 95%
Average Energy Savings %      39% 49%
Exact same as above except in Celsius
Celsius B C D Ti Tw G H
JAN -1 21 -2 23 1 95% 95%
FEB 1 21 -2 23 2 90% 95%
MAR 7 21 -2 23 9 61% 85%
APR 14 21 -2 23 16 32% 53%
MAY 18 21 -2 23 19 15% 27%
JUN 23 23 -2 24 24 0% 0%
JUL 26 26 -2 27 27 0% 0%
AUG 24 24 -2 26 26 0% 0%
SEP 21 21 -2 23 22 2% 5%
OCT 14 21 -2 23 16 32% 53%
NOV 8 21 -2 23 9 59% 83%
DEC 2 21 -2 23 4 83% 95%
Average Energy Savings %      39% 49%
Exact same as above except in Kelvin
Kelvin B C D Ti Tw G H
JAN 272 294 271 23 1 95% 95%
FEB 274 294 271 23 2 90% 95%
MAR 280 294 271 23 9 61% 85%
APR 287 294 271 23 16 32% 53%
MAY 291 294 271 23 19 15% 27%
JUN 296 296 271 24 24 0% 0%
JUL 299 299 271 27 27 0% 0%
AUG 297 297 271 26 26 0% 0%
SEP 294 294 271 23 22 2% 5%
OCT 287 294 271 23 16 32% 53%
NOV 281 294 271 23 9 59% 83%
DEC 275 294 271 23 4 83% 95%
Average Energy Savings %      39% 49%
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