Figure 1 The cooling process of a VCAS The working of the solid desiccant air-conditioning system is given in Figure 2. The hot-humid air specified as point 1 is sent to the desiccant wheel for dehumidification. The air after undergoing dehumidification would come out as hot-dry air given as point 2. Then the air is sensibly cooled till point 3 by a heat exchanger. Then the air is evaporatively cooled till point 4 by an evaporative cooler. Point 4 is substantially away from the comfort zone in this example. The air has to be further cooled to the comfort zone to achieve comfortable conditions for the occupants inside the cooling space. This is the condition where the further cooling of the air to comfort condition by a standard vapor compression air conditioning system is highly appreciated.