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Experimental characterisation of a novel heat exchanger for a solar hot water application under indoor and outdoor conditions

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  • Mondol, Jayanta Deb
  • Smyth, Mervyn
  • Zacharopoulos, Aggelos

Abstract

The performance of a novel heat exchanger unit (‘Solasyphon’) developed for a solar hot water system was experimentally investigated under indoor and outdoor operating conditions. The ‘Solasyphon’ can be easily integrated to an existing single-coil hot water cylinder avoiding the need for costly twin-coil solar hot water storage. A series of tests were conducted under controlled indoor and real outdoor conditions to test and compare the performance of the ‘Solasyphon’ system with a traditional twin-coil (‘coil’) system. The analysis was based upon experimental data collected under various operating conditions including different primary supply temperatures (solar simulated); heating from ambient, heating with a partially stratified storage from ambient and finally under no draw-off and standard draw-off patterns. The outdoor testing was carried out on both systems separately over Summer/Autumn conditions in Northern Ireland. The results showed that the ‘Solasyphon’ system is more effective compared to a traditional twin-coil system for a domestic application where intermittent hot water demand is predominant and under a transient solar input particularly on intermediate or poor solar days. The ‘Solasyphon’ delivered solar heated water directly to the top of the storage producing a stratified supply at a useable temperature. The twin-coil system was found to be more efficient than the ‘Solasyphon’ system under a prolonged heating period.

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  • Mondol, Jayanta Deb & Smyth, Mervyn & Zacharopoulos, Aggelos, 2011. "Experimental characterisation of a novel heat exchanger for a solar hot water application under indoor and outdoor conditions," Renewable Energy, Elsevier, vol. 36(6), pages 1766-1779.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:6:p:1766-1779
    DOI: 10.1016/j.renene.2010.10.031
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    References listed on IDEAS

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    1. Mondol, Jayanta Deb & Smyth, Mervyn & Zacharopoulos, Aggelos & Hyde, Trevor, 2009. "Experimental performance evaluation of a novel heat exchanger for a solar hot water storage system," Applied Energy, Elsevier, vol. 86(9), pages 1492-1505, September.
    2. Mehling, H. & Cabeza, L.F. & Hippeli, S. & Hiebler, S., 2003. "PCM-module to improve hot water heat stores with stratification," Renewable Energy, Elsevier, vol. 28(5), pages 699-711.
    3. Knudsen, S. & Furbo, S., 2004. "Thermal stratification in vertical mantle heat-exchangers with application to solar domestic hot-water systems," Applied Energy, Elsevier, vol. 78(3), pages 257-272, July.
    4. Allen, S.R. & Hammond, G.P. & Harajli, H.A. & McManus, M.C. & Winnett, A.B., 2010. "Integrated appraisal of a Solar Hot Water system," Energy, Elsevier, vol. 35(3), pages 1351-1362.
    5. Mazman, Muhsin & Cabeza, Luisa F. & Mehling, Harald & Nogues, Miquel & Evliya, Hunay & Paksoy, Halime Ö., 2009. "Utilization of phase change materials in solar domestic hot water systems," Renewable Energy, Elsevier, vol. 34(6), pages 1639-1643.
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    1. Naspolini, Helena F. & Rüther, Ricardo, 2012. "Assessing the technical and economic viability of low-cost domestic solar hot water systems (DSHWS) in low-income residential dwellings in Brazil," Renewable Energy, Elsevier, vol. 48(C), pages 92-99.

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