Abstract

SYNOPSIS Maintaining good Indoor Air Quality inside air-conditioned spaces demands more fresh air for ventilation. This in turn increases the heat load on the evaporator coil. For minimising this additional load, a heat recovery unit called an enthalpy wheel is introduced to exchange sensible and latent heat between the fresh air and the return exhaust air. This paper aims to present a simulation of the flow and heat transfer characteristics of the enthalpy wheel. A typical case of hot and humid ambient conditions is considered for analysis. As the wheel is under quasi steady state, transient flow patterns are included to predict the performance of the enthalpy wheel. The amount of energy transferred, during the counter current flows of fresh and return air, is deduced from the heat and mass transfer analysis. It has been found that the effectiveness of heat exchange is nearly 77%. This analysis would be very useful in optimising the design parameters for increasing the heat transferred by the enthalpy wheel.

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