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

5.5. Total optimization of system
is only set to 1. The reason that it is not set to 5 as for some of the other
components is that it would give a ∆T min of less than 1 ◦ C and that just
doesn’t seem realistic.
It was seen in section 5.3.2 page 123 that the system performed best if
T DES2 as well as T DES1 was lowered a little relative to the standard parameter
configuration. So this have been done now (with the new ∆T min s applied),
and it turns out that the ideal value of the desorber temperatures
is T DES1 = 67 ◦ C and T DES2 = 133 ◦ C.
Figure 5.31: A: Optimized parameters (∆T min for ABSO, EVAP, GGHEX4 and T DES1+2 ). B:
The Tradeoff factor shows how many kW of cooling which can be gained by sacrificing 1kW of
electricity (regulated by the current draw).
Figure 5.31A shows how much the optimized parameters improved
the system. COP ABS,f uel is increased 5 to 10 percent points depending
on the current density, while the electrical efficiency remains virtually
unaffected. Only the hot water production decrees a little with the
optimized parameters.
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