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

5. SIMULATION AND RESULTS
Heat Losses: Electrical efficiency
5%
4%
3%
BURN
DES1
DES2
PR
SHEX1
SHEX2
SOFC
Heat Losses: COP
5%
4%
3%
BURN
DES1
DES2
PR
SHEX1
SHEX2
SOFC
ηsys,el,net increase
2%
1%
0%
-1.0 -0.5 0.0 0.5 1.0
-1%
-2%
-3%
-4%
-5%
Component heat loss [kW]
COPABS,fuel increase
2%
1%
0%
-1.0 -0.5 0.0 0.5 1.0
-1%
-2%
-3%
-4%
-5%
Component heat loss [kW]
Figure 5.28: Component heat loss vs A: η sys,el ,net . B: COP ABS,f uel . A+B: None of the
components have been given a heat loss in the standard parameter configuration, so it is not
possible to talk about a percentage increase in heat loss. Hence it has been chosen to see what
happens if 1kW of heat is lost to the surroundings in some selected components (the total fuel
input into the system is still 100kW).
because of the following: When heat is lost before DES2 it reduces the heat
input into both desorbers whereas heat lost after DES2 will only reduce
the heat input into the low temperature desorber.
5.4.4 (Other) Key Parameters
The last group concerns a range of different parameters mainly concerning
the SOFC system. Many of the parameters themselves have been
estimated, so their value is associated with a significant degree of uncertainty.
For each of them it has been estimated to the best extend of the
authors capability how much the true value may be below or above the
chosen parameter value (in appendix D.2 page 272 it is described how
these values have been chosen). Then these two values have been used
to define the interval in which each parameter is plotted in the spider diagram
in figure 5.29. So from these spider diagrams three things can be
read:
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