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4.9. Validation of Model
Distribution of heat rejection
The heat from the absorption cycle is removed by the condenser and the
absorber and according to [27] the distribution should be as follows:
˙Q ABSO = 56%
˙Q COND = 44%
For the single cycle at standard parameter configuration with
additional air pre heat and wet tower the heat removed by the absorber
and the condenser is ˙Q ABSO = 31,1kW (53%) and ˙Q COND = 27,7kW (47%)
respectively.
So in the model a slightly bigger fraction of the heat is removed by the
condenser. The reason is the same as described in the previous section
- low condenser/absorber temperature. If this is increased by 5 ◦ C, COP
will drop to about 0,7 and the fraction of the heat rejected by the absorber
will be 56%.
COP
According to [27], COP ABS should be between 0,70 and 0,75 almost independent
of the temperatures (and load). At the standard configuration,
the model gives a COP ABS of 0,80 which is a little higher than expected.
But this can be due to the assumptions that the heat losses as well as
pressure losses of the components have been neglected. Also the low
condenser/absorber temperature will increase the COP ABS .
Taking the above into consideration it is concluded that the temperature
levels of the absorption cycle and the general behavior of the absorption
model seems to be reasonable.
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