Performance of solar water heaters with narrow mantle heat exchangers |
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Authors: | YC Soo Too M Behnia |
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Affiliation: | School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia |
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Abstract: | This paper evaluates the performance of narrow-gap vertical mantle heat exchangers with a two-pass arrangement for use in pumped-circulation solar water heaters. Both measured mantle side and tank side heat transfer correlations have been developed and implemented in a TRNSYS model of a complete solar water heater incorporating this type of heat exchanger. Predictions of the annual solar contribution for mantle-tank systems are compared to direct-coupled systems. The direct-coupled systems are found to provide slightly higher annual energy saving than mantle-tank systems for standard domestic hot water demand in Australia. However, the reduction in performance is outweighed by the benefit of freeze protection provided by incorporating a collector loop heat exchanger in the system. |
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Keywords: | Mantle heat exchanger Solar water heater TRNSYS |
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