Water-to-water heat pump integration in a solar seasonal storage system for space heating and domestic hot water production of a single-family house in a cold climate.

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From: Solar Energy(Vol. 213)
Publisher: Elsevier Science Publishers
Document Type: Report; Brief article
Length: 366 words

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Keywords Solar heating system; Seasonal thermal storage; Heat pump; Solar fraction Highlights * A modulating heat pump is integrated in a solar seasonal storage heating system. * The solar fraction and the efficiencies of the system components are analyzed. * The heat pump integration becomes more beneficial for the unfavorable analyzed cases. * A heat pump can be a feasible solution to increase the solar fraction of the system. Abstract Solar systems can supply space heating and domestic hot water to houses covering a large part of the demand by using solar energy. The use of long-term (seasonal) storage systems is fundamental to reach high levels of solar fraction for the application of these systems in cold climates. Building-scale systems are an attractive solution despite a higher specific installation cost of the tank, because they require less space and have smaller distribution networks which helps reduce thermal losses and costs. However, small-scale systems have restraints on reaching high levels of solar fraction. The integration of a heat pump unit in the system can be strategic to increase the performance level of the system and to enhance the use of solar energy. This study examines the integration of a modulating water-to-water heat pump in a solar system equipped with a seasonal storage. The heat pump uses the water of the seasonal tank as the heat source, exploiting the residual heat stored in the tank at the end of the heating season. The system performance is assessed through a number of energy simulations using TRNSYS. A similar solar system without the heat pump is used as a reference system to compare the results and assess the impact of the heat pump integration. The results show that the solar fraction can be increased by approximately five percentage points by including a heat pump. Author Affiliation: (a) Free University of Bolzano-Bozen, piazza Università 1, 39100 Bolzano, Italy (b) Carleton University, 1125 Colonel By Dr, ON K1S 5B6 Ottawa, Canada (c) University of Trento, Via Mesiano, 77, 38123 Trento, Italy * Corresponding author. Article History: Received 17 August 2020; Revised 22 October 2020; Accepted 18 November 2020 Byline: Maria Pinamonti [maria.pinamonti@natec.unibz.it] (a,*), Ian Beausoleil-Morrison (b), Alessandro Prada (c), Paolo Baggio (c)

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Gale Document Number: GALE|A648932531