Environmental Engineering Reference
In-Depth Information
Figure 16.2.2 General concept of the thermally activated desiccant cooling technologies (Enteria and
Mizutani, 2011).
coolers are applied when the required temperature of the air after the evaporative
cooler is still insufficient to support indoor thermal comfort conditions.
16.2.2 Advantages of the open systems
The chemical contents of the air, such as indoor volatile organic compounds (VOCs),
are readily absorbed by desiccants (Wolfrum et al., 2008), thus solving the problem of
the recirculation of indoor air pollutants in the recirculation method of air-conditioning
systems. In addition, desiccant-based air-conditioning systems have controlled indoor
air quality, as reported by Zhang et al. (2007). Based on studies conducted by Fang
et al. (2008), desiccant-coated wheels have removed VOCs from air, in particular
the most common VOCs, toluene and n-hexane (Wolfrum et al. 2008). Therefore,
desiccant-based air-conditioning systems have not only solved health problems related
to moisture in buildings (Ahman et al. 2000), but have also improved the quality of
indoor air. This applies also to the management of the indoor environment for office
buildings, as reported by Shaw et al. (2005) of the National Research Council of
Canada. Most importantly, desiccant-based air-conditioning systems can be applied to
solve the problem of energy, comfort, environment and indoor air for those of sensitive
dispositions, such as people in nursing care (Theodosiou and Ordoumpozanis, 2008).
The open-cycle desiccant-based air-conditioning system utilizes desiccants which
are
mostly
salt-based.
Development
of
other
aqueous
absorbent
desiccants
is
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