Environmental Engineering Reference
In-Depth Information
Figure 5.41
Measured and simulated temperature levels on the regeneration side together with
measured and simulated switching times for the auxiliary heating
Also, the influence of the desiccant system component efficiencies was studied. A
major influence on auxiliary heating demand is given by the humidifier efficiencies.
Decreasing the humidification efficiency from 85% to 75% nearly doubles the auxil-
iary heating demand. A dramatic rise in auxiliary heating occurs for humidification
efficiencies below 70% (see Figure 5.42).
At 80% humidification efficiency and 62% heat recovery efficiency, the auxiliary
demand more than doubles if the sorption wheel dehumidification reduces to 70%.
The auxiliary heating energy can be reduced almost to zero if the efficiency of the heat
exchanger is improved from the measured 62% to 75% (see Figure 5.43).
100 000
10 000
1 000
measured consumption
100
10
0.4
0.5
0.6
0.7
0.8
0.9
1
Humidification efficiency
Figure 5.42
Simulated auxiliary heating energy demand as a function of the efficiency of both
humidifiers
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