Environmental Engineering Reference
In-Depth Information
10
1.0
Q E
constant enthalpy
9
0.9
Q E
measured
Q E
variable enthalpy
COP constant enthalpy
COP measured
COP variable enthalpy
8
0.8
7
0.7
6
0.6
5
0.5
4
0.4
3
0.3
2
0.2
1
0.1
0
0.0
105
110
115
120
125
130
135
140
145
150
Temperature at generator entry / °C
Figure 6.4 Measured and simulated cooling power and COP for the second Stuttgart prototype
evaporator cooling capacity decrease at lower evaporator temperatures. For a DACM
with coaxial SHX, a surface wetting factor W of 1.0 and a GHX efficiency GHX
of 0.3, the design cooling capacity of 2.5 kW could be reached for evaporator inlet
temperatures of 12 and 24 C, and at generator heating inlet temperatures of 162
and 123 C. The corresponding COPs were 0.38 and 0.85. Furthermore, the lower
the absorber cooling inlet temperature, the higher the resulting evaporator cooling
capacity. Figure 6.5 presents the performance at different GHX heat recovery factors
for an evaporator inlet temperature of 12 C and a constant generator temperature
Figure 6.5 Simulated COP and evaporator cooling power as a function of the surface wetting factor
and the heat recovery efficiency of the auxiliary GHE
 
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