integration of solid oxide fuel cells and ... - Ea Energianalyse

1. INTRODUCTION
Ammonia-water
The COP values come from figure 6 in [20] at a heat rejection temperature
of 35 ◦ C. The details about how the cycles work will not be explained here
but a complete diagram is shown in appendix B.1 page 228.
Basic single stage cycle, COP = 0,6
Same cycle as described in previous section and in figure 1.2 (plus
a rectifier between desorber and condenser).
Single stage cycle with pre cooler, COP = 0,65
The same as the above. A pre cooler (the same as a suction line heat
exchanger) is added (transferring heat from point 2 to point 4 in
figure 1.2).
Absorber heat exchanger, COP = 0,9
The same as the above. Two extra solution heat exchangers - one in
the desorber and one in the absorber, are added.
Desorber absorber heat exchange, COP = 1,3
The same as the above. Another extra heat exchange (done by an
external circuit) between absorber and desorber is added. This
configuration is normally called GAX - Generator-Absorber-heat
eXchanger.
These configurations show that it is possible to double up the performance
of the system by adding extra heat exchangers etc.
Water-lithium bromide
For the double, triple and quadruple stage, the mentioned COP’s are
taken from figure 4 in [20] and the temperature in parenthesis is
the heat supply temperature. For the three mentioned configurations
the temperature of heat rejection and chilled water is 29 ◦ C and 7 ◦ C
respectively.
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Basic single stage cycle, COP = 0,7
Same cycle as described in previously section and shown in figure
1.2 (COP is taken from table 4 in [35]).
Double stage cycle, parallel flow, COP = 1,3 (150 ◦ C)
An extra cycle consisting of a pump, solution heat exchanger,