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Hot water in
Hot water out
Chilled
water in
Chilled
water out
Cooling
water in
Cooling
water out
Bed 1
Bed 2
Condensate
return
Evaporator
Condenser
By-pass
opened
Fig. 8.8 Schematic of an adsorption chiller. Mode (b): Mass recovery. Water vapor flows from Bed
1 to Bed 2 due to the difference in pressure
Hot water in
Hot water out
Chilled
water in
Chilled
water out
Cooling
water in
Cooling
water out
Bed 1
Bed 2
Condensate
return
Evaporator
Condenser
Fig. 8.9 Schematic of an adsorption chiller. Mode (c): Heat recovery. Cooling water extracts heat
from Bed 1 and releases it to Bed 2 before flowing through the condenser
Thus one cycle is complete and in the next stage, the cycle is repeated, and the beds
perform an alternating role. Bed 1 starts adsorbing and is connected to the evaporator
and Bed 2 starts desorbing and gets connected to the condenser. The pressure of Bed
1 becomes essentially the same as that of evaporator and Bed 2 attains the same
pressure as of condenser. Hence in the mass recovery mode, the desorbed vapor of
Bed 2 is further passed to Bed 1 in order to achieve the mechanical equilibrium
between the two beds. The heat is extracted from the hot Bed 2 by the cooling water
and released to comparatively cooler Bed 1, during the heat recovery mode.