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Alternative for Summer Use of Solar Air Heaters in Existing Buildings

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  • Sergio L. González-González

    (Department of Energy Engineering and Fluidmechanics, University of Valladolid, 47002 Valladolid, Spain)

  • Ana Tejero-González

    (Department of Energy Engineering and Fluidmechanics, University of Valladolid, 47002 Valladolid, Spain)

  • Francisco J. Rey-Martínez

    (Department of Energy Engineering and Fluidmechanics, University of Valladolid, 47002 Valladolid, Spain)

  • Manuel Andrés-Chicote

    (CARTIF Technology Centre, Parque Tecnológico de Boecillo, 205, Boecillo, 47151 Valladolid, Spain)

Abstract

Among solar thermal technologies for indoor heating, solar air heaters (SAH) are appealing for implementation on existing buildings due to their simplicity, fewer risks related to the working fluid, and possible independence from the building structure. However, existing research work mainly focuses on winter use and still fails in providing effective solutions for yearly operation, which would enhance their interest. With the aim of analysing an alternative summer use, this work firstly characterises a double channel-single pass solar air collector through experimentation. From the obtained results, modelling and simulation tasks have been conducted to evaluate the possibilities of using hot air, provided by the SAH, while operating under summer conditions within a closed loop, to feed an air-to-water heat exchanger for domestic hot water (DHW) production. The system is studied through simulation under two different configurations for a case study in Valladolid (Spain), during the period from May to September for different airflows in the closed loop. Results show that daily savings can vary from 27% to 85% among the different operating conditions; a configuration where make-up water is fed to the heat exchanger being preferable, with a dedicated water tank for the solar heated water storage of the minimum possible volume. The more favourable results for the harshest months highlight the interest of extending the use of the solar air heaters to the summer period.

Suggested Citation

  • Sergio L. González-González & Ana Tejero-González & Francisco J. Rey-Martínez & Manuel Andrés-Chicote, 2017. "Alternative for Summer Use of Solar Air Heaters in Existing Buildings," Energies, MDPI, vol. 10(7), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:985-:d:104438
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    References listed on IDEAS

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    Cited by:

    1. Jinwei Ma & Qiang Zhao & Yuehong Su & Jie Ji & Wei He & Zhongting Hu & Tingyong Fang & Haitao Wang, 2018. "The Thermal Behavior of a Dual-Function Solar Collector Integrated with Building: An Experimental and Numerical Study on the Air Heating Mode," Energies, MDPI, vol. 11(9), pages 1-18, September.
    2. Javier M. Rey-Hernández & Eloy Velasco-Gómez & Julio F. San José-Alonso & Ana Tejero-González & Sergio L. González-González & Francisco J. Rey-Martínez, 2018. "Monitoring Data Study of the Performance of Renewable Energy Systems in a Near Zero Energy Building in Spain: A Case Study," Energies, MDPI, vol. 11(11), pages 1-17, November.

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