Gweru, Zimbabwe
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 69 70 29 41 40 2% 5%
FEB 68 70 29 41 39 5% 10%
MAR 68 70 29 41 39 5% 10%
APR 65 70 29 41 36 12% 23%
MAY 61 70 29 41 32 22% 39%
JUN 57 70 29 41 28 32% 53%
JUL 55 70 29 41 26 37% 60%
AUG 61 70 29 41 32 22% 39%
SEP 68 70 29 41 39 5% 10%
OCT 71 71 29 42 42 0% 0%
NOV 72 72 29 43 43 0% 0%
DEC 70 70 29 41 41 0% 0%
Average Energy Savings %      12% 21%
Exact same as above except in Celsius
Celsius B C D Ti Tw G H
JAN 21 21 -2 23 22 2% 5%
FEB 20 21 -2 23 22 5% 10%
MAR 20 21 -2 23 22 5% 10%
APR 18 21 -2 23 20 12% 23%
MAY 16 21 -2 23 18 22% 39%
JUN 14 21 -2 23 16 32% 53%
JUL 13 21 -2 23 14 37% 60%
AUG 16 21 -2 23 18 22% 39%
SEP 20 21 -2 23 22 5% 10%
OCT 22 22 -2 23 23 0% 0%
NOV 22 22 -2 24 24 0% 0%
DEC 21 21 -2 23 23 0% 0%
Average Energy Savings %      12% 21%
Exact same as above except in Kelvin
Kelvin B C D Ti Tw G H
JAN 294 294 271 23 22 2% 5%
FEB 293 294 271 23 22 5% 10%
MAR 293 294 271 23 22 5% 10%
APR 291 294 271 23 20 12% 23%
MAY 289 294 271 23 18 22% 39%
JUN 287 294 271 23 16 32% 53%
JUL 286 294 271 23 14 37% 60%
AUG 289 294 271 23 18 22% 39%
SEP 293 294 271 23 22 5% 10%
OCT 295 295 271 23 23 0% 0%
NOV 295 295 271 24 24 0% 0%
DEC 294 294 271 23 23 0% 0%
Average Energy Savings %      12% 21%
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