Tehran
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 41 70 29 41 12 71% 91%
FEB 44 70 29 41 15 63% 87%
MAR 51 70 29 41 22 46% 71%
APR 64 70 29 41 35 15% 27%
MAY 73 73 29 44 44 0% 0%
JUN 83 83 29 54 54 0% 0%
JUL 87 87 29 58 58 0% 0%
AUG 88 88 29 59 59 0% 0%
SEP 78 78 29 49 49 0% 0%
OCT 66 70 29 41 37 10% 19%
NOV 53 70 29 41 24 41% 66%
DEC 44 70 29 41 15 63% 87%
Average Energy Savings %      26% 37%
Exact same as above except in Celsius
Celsius B C D Ti Tw G H
JAN 5 21 -2 23 7 71% 91%
FEB 7 21 -2 23 8 63% 87%
MAR 11 21 -2 23 12 46% 71%
APR 18 21 -2 23 19 15% 27%
MAY 23 23 -2 24 24 0% 0%
JUN 28 28 -2 30 30 0% 0%
JUL 31 31 -2 32 32 0% 0%
AUG 31 31 -2 33 33 0% 0%
SEP 26 26 -2 27 27 0% 0%
OCT 19 21 -2 23 21 10% 19%
NOV 12 21 -2 23 13 41% 66%
DEC 7 21 -2 23 8 63% 87%
Average Energy Savings %      26% 37%
Exact same as above except in Kelvin
Kelvin B C D Ti Tw G H
JAN 278 294 271 23 7 71% 91%
FEB 280 294 271 23 8 63% 87%
MAR 284 294 271 23 12 46% 71%
APR 291 294 271 23 19 15% 27%
MAY 296 296 271 24 24 0% 0%
JUN 301 301 271 30 30 0% 0%
JUL 304 304 271 32 32 0% 0%
AUG 304 304 271 33 33 0% 0%
SEP 299 299 271 27 27 0% 0%
OCT 292 294 271 23 21 10% 19%
NOV 285 294 271 23 13 41% 66%
DEC 280 294 271 23 8 63% 87%
Average Energy Savings %      26% 37%
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