9 TEWI Assessment of Conventional and Solar Powered Cooling Systems
169
7313
3504
14462
6132
26392
8760
0
5000
10000
15000
20000
25000
30000
Conventional cooling system
Solar cooling system
Annual Electricity Consumption (kWh)
Conventional cooling system
Solar cooling system
Medium temperature
application (at –7 °C)
Room air-conditioning
system (at 12 °C)
Low temperature
application (at –25 °C)
Fig. 9.5 Electricity consumption for various applications: conventional vs solar cooling
0
5
10
15
20
25
30
35
Conv ent i on al Cool i ng
Sy s t em
m
e
t
s
y
S
g
n i
l
o
o
C
r
a
l
o
S
3.788
1.815
0.016
0.097
1.013
0
4.816
1.912
7.491
3.176
0.021
0.129
3.900
0
11.412
3.306
13.671
4.538
0.026
0.162
17.649
0
31.346
4.699
Global Warming Impact (t-CO
2 eq.)
Conventional Cooling System
Solar Cooling System
Medium temperature
application (at –7 °C)
Room air-conditioning
system (at 12 °C)
Low temperature
application (at –25 °C)
Indirect emission for
electricity consumption
Indirect emission to
build the system
Direct emission for
refrigerant leakage
TEWI
②
①
③
④
①
①
②
②
③
③
④
④
Fig. 9.6 Indirect, direct and total equivalent warming impact comparison