164
Md. A. Islam and B. B. Saha
Table 9.6 Results of assessment: conventional cooling system
Parameter
System type
Room
air-conditioning
(R32)
Medium temperature
refrigeration (R134a)
Low-temperature
refrigeration
(R404A)
COP carnot
10.184
5.663
3.818
COP
5.989
3.029
1.660
Refrigerant flow rate,
˙
m (kg h –1 )
137.257
236.251
143.344
Discharge
temperature of
refrigerant (°C)
78.971
69.950
160.416
Discharge pressure of
refrigerant (kPa)
2478.310
1016.592
2478.31
Compression ratio
2.111
4.509
7.408
Annual electricity
consumption (kWh)
7312.923
14,462.196
26,392.087
Annual indirect
warming impact on
electricity
consumption (t-CO 2
eq.)
3.788
7.491
13.671
Total indirect
warming impact for
building the cooling
system (t-CO 2 eq.)
0.234
0.311
0.389
Annual indirect
warming impact for
building the cooling
system (t-CO 2 eq.)
0.016
0.021
0.026
Annual direct
warming impact
(t-CO 2 eq.)
1.013
3.900
17.649
Annual TEWI
(t-CO 2 eq.)
4.816
11.412
31.346
9.3.2 TEWI of Solar Cooling System
Operating conditions and assumptions for the solar cooling system is summarized in
Table 9.7. Same operating temperatures (T eva and T con ), operation hours and cooling capacity have been set for the adsorption cooling system to compare the results
with the conventional cooling system. Natural refrigerants (GWP = 0) have been
chosen to decrease environmental impact. Three different functional pairs have been
selected for three different applications. Silica gel/water pair is suitable for the temperature range of room air-conditioning systems. Moreover, medium temperature
Md. A. Islam and B. B. Saha
Table 9.6 Results of assessment: conventional cooling system
Parameter
System type
Room
air-conditioning
(R32)
Medium temperature
refrigeration (R134a)
Low-temperature
refrigeration
(R404A)
COP carnot
10.184
5.663
3.818
COP
5.989
3.029
1.660
Refrigerant flow rate,
˙
m (kg h –1 )
137.257
236.251
143.344
Discharge
temperature of
refrigerant (°C)
78.971
69.950
160.416
Discharge pressure of
refrigerant (kPa)
2478.310
1016.592
2478.31
Compression ratio
2.111
4.509
7.408
Annual electricity
consumption (kWh)
7312.923
14,462.196
26,392.087
Annual indirect
warming impact on
electricity
consumption (t-CO 2
eq.)
3.788
7.491
13.671
Total indirect
warming impact for
building the cooling
system (t-CO 2 eq.)
0.234
0.311
0.389
Annual indirect
warming impact for
building the cooling
system (t-CO 2 eq.)
0.016
0.021
0.026
Annual direct
warming impact
(t-CO 2 eq.)
1.013
3.900
17.649
Annual TEWI
(t-CO 2 eq.)
4.816
11.412
31.346
9.3.2 TEWI of Solar Cooling System
Operating conditions and assumptions for the solar cooling system is summarized in
Table 9.7. Same operating temperatures (T eva and T con ), operation hours and cooling capacity have been set for the adsorption cooling system to compare the results
with the conventional cooling system. Natural refrigerants (GWP = 0) have been
chosen to decrease environmental impact. Three different functional pairs have been
selected for three different applications. Silica gel/water pair is suitable for the temperature range of room air-conditioning systems. Moreover, medium temperature