Abstract
Convective cooling of a room through a heat exchanger (cooling loop) using cold water from an underground evaporatively cooled water storage tank has been studied. The water in the tank is being evaporatively cooled by a suitable aeration system (aeration loop). The performance of the system is evaluated in terms of a seasonal discomfort index of the room. The effects of size of storage tank, mass flow rates in the aeration loop and cooling loop, temperature penalties of the aeration loop and cooling loops on the performance of the system have been numerically investigated. The analysis shows that, for given system parameters (corresponding to a specific value of discomfort index), there is an optimum value of mass flow rate in the aeration loop for which the total pumping energy required to operate the aeration and cooling loops is a minimum.
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