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Thermal performance of a trapezoidal-shaped solar collector/energy store

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  • Cruz, José M. S.
  • Hammond, Geoffrey P.
  • Reis, Albino J. P. S.

Abstract

A simple, low-cost solar water heater has been developed for operation in Mediterranean Europe or regions of similar latitude (40-45° north). It takes the form of a trapezoidal-shaped water store in direct contact with an inclined flat-plate solar collector assembly. This cross-section induces thermal stratification in the water store, and provides sufficient energy storage to meet typical daily hot-water demand. Its thermal performance is critically dependent on the waterside convective heat-transfer coefficient on the backward-reclining collector plate; previously evaluated by Cruz et al. (Cruz JMS, Hammond GP, Reis AJPS. Buoyancy-driven convective heat exchange in a trapezoidal-shaped solar collector/thermal store. In: Proc. of the 5th ASME/JSME Joint Thermal Engineering Conf., San Diego, CA (ASME, New York), 1999, 9 pp). In the current design, the absorber plate inclination to the horizontal was fixed at 45° (close to the local latitude) in order to yield maximum solar gain over a typical year. The energy saving provided by the solar collector/thermal store demonstrator largely depends on the amount of thermal stratification within the trapezoidal storage cavity. This was evaluated via both computation and measurements of the temperature field. A thermal network analysis model was then used to assess the energy-saving potential of the composite system. It indicated that a 30-70% reduction in daily load could be obtained in contrast to direct, electrical or gas, heating: the smaller saving occurred at times of greatest use or hot-water take-off.

Suggested Citation

  • Cruz, José M. S. & Hammond, Geoffrey P. & Reis, Albino J. P. S., 2002. "Thermal performance of a trapezoidal-shaped solar collector/energy store," Applied Energy, Elsevier, vol. 73(2), pages 195-212, October.
    • Handle: RePEc:eee:appene:v:73:y:2002:i:2:p:195-212
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    1. Hammond, Geoffrey P., 1996. "Nuclear energy into the twenty-first century," Applied Energy, Elsevier, vol. 54(4), pages 327-344, August.
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    Cited by:

    1. Yang, Zhen & Garimella, Suresh V., 2010. "Molten-salt thermal energy storage in thermoclines under different environmental boundary conditions," Applied Energy, Elsevier, vol. 87(11), pages 3322-3329, November.
    2. Smyth, Mervyn & Barone, Giovanni & Buonomano, Annamaria & Forzano, Cesare & Giuzio, Giovanni Francesco & Palombo, Adolfo & Mondol, Jayanta & Muhumuza, Ronald & Pugsley, Adrian & Zacharopoulos, Aggelos, 2020. "Modelling and experimental evaluation of an innovative Integrated Collector Storage Solar Water Heating (ICSSWH) prototype," Renewable Energy, Elsevier, vol. 157(C), pages 974-986.
    3. Nkwetta, Dan Nchelatebe & Smyth, Mervyn, 2012. "Comparative field performance study of concentrator augmented array with two system configurations," Applied Energy, Elsevier, vol. 92(C), pages 800-808.
    4. Harmim, A. & Boukar, M. & Amar, M. & Haida, Aek, 2019. "Simulation and experimentation of an integrated collector storage solar water heater designed for integration into building facade," Energy, Elsevier, vol. 166(C), pages 59-71.
    5. Garnier, Celine & Muneer, Tariq & Currie, John, 2018. "Numerical and empirical evaluation of a novel building integrated collector storage solar water heater," Renewable Energy, Elsevier, vol. 126(C), pages 281-295.
    6. Singh, Ramkishore & Lazarus, Ian J. & Souliotis, Manolis, 2016. "Recent developments in integrated collector storage (ICS) solar water heaters: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 270-298.
    7. Barone, G. & Buonomano, A. & Palmieri, V. & Palombo, A., 2022. "A prototypal high-vacuum integrated collector storage solar water heater: Experimentation, design, and optimization through a new in-house 3D dynamic simulation model," Energy, Elsevier, vol. 238(PC).
    8. Feliński, P. & Sekret, R., 2016. "Experimental study of evacuated tube collector/storage system containing paraffin as a PCM," Energy, Elsevier, vol. 114(C), pages 1063-1072.
    9. Muneer, T. & Asif, M. & Cizmecioglu, Z. & Ozturk, H.K., 2008. "Prospects for solar water heating within Turkish textile industry," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(3), pages 807-823, April.

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