Environmental Engineering Reference
In-Depth Information
120
50
Generator heating water
110
40
in
out
100
30
90
20
Evaporator cold brine
in
80
10
out
70
0
60
-10
0
2
4
6
8
10
12
14
16
18
20
Time / h
Figure 5.61
Temperature levels at 21.5
◦
C absorber inlet temperature and 24.4
◦
C condenser outlet
temperature
external mass flow rate to the condenser and absorber slightly increased during the
course of the measurements from 23
◦
C initially at the lowest generator temperature
to 26
◦
C for the condenser and 29
◦
C for the absorber inlet temperature with temper-
ature differences between the inlet and outlet of 2-3 K. The lowest logged external
evaporator outlet temperature was
15
◦
C at a generator heating inlet temperature of
−
135
◦
C.
To improve the performance, the machine was opened up and surface corrosion was
allowed to take place in the components, which should improve the surface wetting
and thus the evaporator and absorber performance. The machine then operated reliably
at COPs between 0.3 and 0.4 with cooling power levels up to 2.7 kW (see Figure 5.63).
3.0
1.2
Q
o
18/15 °C
Q
o
12/6 °C
COP 18/15 °C
COP 12/6
°
C
2.5
1.0
2.0
0.8
1.5
0.6
1.0
0.4
0.5
0.2
0.0
0.0
105
110
115
120
125
130
135
140
145
150
155
Generator heating inlet temperature / °C
Figure 5.62
Cooling power and COP for different evaporator temperature levels as a function of
generator inlet temperature
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