Abstract

Thermally driven chillers also known as sorption heat pumps have drawn considerable attention in recent years. They can be divided into two main categories: absorption (liquid-vapor) and adsorption (solid-vapor) systems. Even though sorption cycles have relatively lower coefficient of performance compared to conventional refrigeration cycles, however they prevail in terms of heat source, electric consumption for moving parts, mechanical wear etc. In order to enhance their environmentally friendly operation, sorption chillers can be driven by solar power.

In this study a solar driven absorption chiller which utilizes evacuated tubes collectors and intermediate heat exchanger is simulated. The model’s governing equations derived from the energy balance on each component of the system are solved numerically. The COP, the solar COP, the overall exergy efficiency, the required collectors’ surface and the collectors and tank normalized cost are calculated for various heat source temperatures. Moreover, all calculations are repeated for various values of heat exchanger effectiveness in order to determine the maxima and minima of the system’s operation. It is proved that the maxima are reached at lower inlet temperatures for higher values of the intermediate heat exchanger.

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