Environmental Engineering Reference
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(a)
Exhaust air
Return air
A
A
A
Plate HX
Heat
Outdoor air
Bring air
EX
A
A
A
Chilled water
Diluted solution
Concentrated solution
(b)
Hot water
Plate HX
Outdoor air
Heat
Recovery
A
A
A
Exhaust air
Heat EX
Diluted
Concenerated
Figure 16.5.2 Schematic of open-cycle liquid desiccant air-conditioning system with multiple air-
absorbent contact exchanger (a) air dehumidifier and (b) absorbent regenerator (Liu
et al., 2004).
effectiveness. Hao et al. (2007) investigated the application of desiccant dehumidifica-
tion with chilled ceiling and displacement ventilation. This showed it to be feasible in
hot and humid climates owing to its capability of responding consistently to cooling
demand. In addition, the system reduces building energy consumption by 8.2% com-
pared to conventional air-conditioning. Niu et al. (2002) investigated application of
the desiccant dehumidification by desiccant wheel with chilled-ceiling (Figure 16.5.3).
The aim of the installation is for the desiccant to reduce air moisture content and thus
avoid the condensation of moisture in the ceiling panel, and at the same time cool
the air by means of the chilled ceiling. The results showed the combined system can
save up to 44% of primary energy consumption in which 70% of the operating hour
of the desiccant dehumidification can be provided with less than 80 C regeneration
temperature.
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