Development of an efficiency equation for solar evaporator- collectors

Amin, Zakaria Mohd, Karim, M.A., & Hawlader, M.N.A. (2014) Development of an efficiency equation for solar evaporator- collectors. In 52nd Annual Conference, Australian Solar Energy Society (Australian Solar Council), 8-9 May 2014, Melbourne Convention and Exhibition Centre, Melbourne, Vic.

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Abstract

Considering the growing energy needs and concern for environmental degradation, clean and inexhaustible energy sources, e.g solar energy are receiving greater attention for various applications. The use of solar energy systems for low temperature applications reduces the burden on conventional fossil fuels and has little or no harmful effects on the environment. The performance of a solar system depends to a great extent on the collector used for the conversion of solar radiant energy to thermal energy. A solar evaporatorcollector (SEC) is basically an unglazed flat plate collector where refrigerant, like R134a, is used as the working fluid. As the operating temperature of SEC is very low, it collects energy both from solar irradiation and ambient energy leading to a much higher efficiency than the conventional collectors. The capability of SEC to utilize ambient energy also enables the system to operate at night. Therefore it is not appropriate to use for the evaluation of performance of SEC by conventional efficiency equation where ambient energy and condensation is not considered as energy input in addition to irradiation. In the National University of Singapore, several Solar Assisted Heat Pump (SAHP) systems were built for the evaluation of performance under the metrological condition of Singapore for thermal applications of desalination and SEC was the main component to harness renewable energy. In this paper, the design and performance of SEC are explored. Furthermore, an attempt is made to develop an efficiency equation for SEC and maximum efficiency attained 98% under the meteorological condition of Singapore.

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ID Code: 94894
Item Type: Conference Paper
Refereed: Yes
Keywords: Heat pump, Solar Energy, Ambient Energy, Evaporator Collector, Collector Efficiency
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Copyright Owner: Copyright 2014 [Please consult the author]
Deposited On: 14 Apr 2016 00:06
Last Modified: 15 Apr 2016 01:33

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