Solar hybrid air-conditioning design for buildings in hot and humid climates - Solar Energy Sciences and Engineering Applications - page 489

Figure 15.2.3 Solar adsorption refrigeration system for space conditioning (New abbreviation: A:
adsorber; and D: desorber).
Figure 15.2.4 Solar desiccant cooling system for space conditioning.
merit of thermal storage, there are health and safety concerns to the building occu-
pants. Since the supply air would be in direct contact with the slightly corrosive liquid
sorbent, there is a risk of carry-over to the conditioned space. Desiccant cooling using
solid sorbent, however, is stable in the processes of adsorption and desorption, so it
is more suitable for direct application in the supply air stream. In this regard, a solid
desiccant wheel is the major component of desiccant cooling. The other components
include a thermal wheel, direct evaporative coolers, solar collectors, a hot water stor-
age tank and an auxiliary heater. The thermal wheel is used to remove the sensible heat
of the process air after passing the desiccant wheel. The evaporative cooler at the sup-
ply air stream is used to cool down the process air to become supply air, which still has
a sufficiently low humidity ratio for handling the space latent load. The evaporative
cooler at the exhaust air stream is used to cool down the room air for better sensible
heat recovery at the thermal wheel.