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  • Simulation and experimental investigation of two hybrid solar domestic water heaters with drain water heat recovery

    July 26, 2015 Editor 0

    Summary

    In this paper, the performance of two solar domestic hot waters (SDHW) with drain water heat recovery (DWHR) units is investigated. Both SDHW systems are recently installed at the Archetype Sustainable Twin Houses at Kortright Center, Vaughan, Ontario. The first SDWH system in House A consists of a flat plate solar thermal collector in combination with a gas boiler and a DWHR unit. The second SDHW system in House B includes an evacuated tube solar collector, an electric tank, and a DWHR unit. Both systems are modeled in TRNSYS, and the models are validated by experimental data. The addition of the DWHR and the flat-plate solar thermal collector would result in 1831 kWh of annual energy saving in House A. While the addition of the DWHR and the evacuated tube collector in House B would result in an annual energy saving of 1771 kWh. Subsequently, the models are used to investigate the performance of similar systems for five major Canadian cities of Halifax, Montreal, Toronto, Edmonton, and Vancouver. The conjunctions of solar thermal collectors with DWHR units are found most beneficial in Edmonton. It is also noted from experimental and simulated results that flat-plate solar collector-based water heater produced more thermal energy than the system based on the evacuated tube solar collector for all major Canadian cities. Copyright © 2015 John Wiley & Sons, Ltd.

    Thumbnail image of graphical abstract

    This paper presents TRNSYS simulations and experimental studies of two solar domestic hot water (SDWH) systems with drain water heat recovery (DWHR) units. The validated models are used to investigate similar systems for five Canadian cities. Edmonton has the highest annual energy consumption of 3763 kWh by gas boiler. Edmonton has the highest values of heat recovery by the DWHR, that is, 941 kWh. The flat-plate collector-based SDWH produced more annual energy than the evacuated tube collectors for all chosen cities.

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