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6.4. Economics
6.4 Economics
When the profitability calculations in chapter 2 regarding the hotel were
made, the thermodynamical EES model was not yet created, and hence
the efficiencies, COP etc. had to be estimated - partially by looking at
similar commercial products.
It is now examined how the assumptions used in the Hotel case fit
with the results of the EES model.
W [kW] | Q [kW]
1000
900
800
700
600
500
400
300
200
100
0
EES model vs Hotel Case assumption
141
141
268 292
399 406
Hotel Calculations
Hot Water Heating
Cooling Power
Electricical Power
Optimized Model
Figure 6.7: The left bar shows the generation of electricity, cooling and heating in the Hotel
Case calculations for the Hot Climate (based on estimated η el and COP). The right bar shows the
output of the optimized EES model for the same fuel input (800kW). The hot water production
has been set to 141kW as in the hotel calculations 9 .
In the hotel case ”Hot Climate” the natural gas consumption was
800kW in order to generate enough electricity for the hotel. So the fuel
input into the optimized EES model has been set to 800kW as well. In
the hotel case it was decided that the total demand of domestic hot water
(141kW) should come from the waste heat. So in the EES model the ABS
unit has only been allowed to use so big a fraction of the waste heat, that
there was enough heat left to generate 141kW of hot water 10 .
10 In all the previous EES simulations, the ABS unit has been allowed to extract as
much energy from the exhaust gas as possible go generate a bigger amount of cooling
and a smaller amount of hot water.
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