Solar-desiccant air-conditioning systems - Solar Energy Sciences and Engineering Applications - page 531

Sensible Heat Wheel

12 11

6 7 8 9

5

Exhaust

Chilled Ceiling

Evaporative Cooler Gas Heater

Room

3 2

1

4

Ambient

10 11 Desiccant Wheel

Cooling Coil

Figure 16.5.3 Chilled-ceiling with solid desiccant air-conditioning system (Niu et al., 2002).

Mixed air

Air

(a)

Heater core Evaporator Fan

Dry air from Desiccant

Mixed air

Air

Humid air Evaporator Fan

(b)

Figure 16.5.4 Automobile air conditioning system: a) conventional and b) with desiccant (Nagaya et al.,
2006).

16.5.4 Hot and humid regions
Khalid et al. (2008) conducted numerical investigations with regard to the applica-
tion of solar desiccant air-conditioning in Pakistan. The system had a higher COP in
Lahore's climatic conditions, without auxiliary cooling. Hirunlabh et al. (2007) con-
sidered the applicability of the solid fixed-bed desiccant air-conditioning in Thailand,
showing that it can save 24% of electric energy. Furthermore, it is practical for
application in large buildings as a centralized air-conditioning system. Nagaya et al.
(2006) investigated the application of the solid desiccant wheel in an automobile air-
conditioning system (Figure 16.5.4). This showed that the system is energy efficient