Modelling and simulation of a heat pump for simultaneous heating and cooling |
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Authors: | Paul Byrne Jacques Miriel Yves Lénat |
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Affiliation: | 1. Equipe MTRhéo, Laboratoire LGCGM, INSA Rennes - Université de Rennes1, IUT Génie Civil, 3 rue du clos Courtel, BP 90422, 35704, Rennes Cedex 7, France
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Abstract: | The heat pump for simultaneous heating and cooling (HPS) carries out space heating, space cooling and hot water production
for small office and residential buildings. It works under heating, cooling and simultaneous modes to produce hot and chilled
water according to the thermal demand of the building. A subcooler connected to a water tank is placed after the condenser
to recover some energy by subcooling of the refrigerant during a heating mode. The water loop at a higher temperature than
ambient air is used subsequently as a source for a water evaporator. Average winter performance is improved compared to a
standard reversible heat pump (HP). The air evaporator is defrosted by a two-phase thermosiphon without stopping the heat
production. The operation of the HPS is modelled using TRNSYS software. The model is validated using results of an experimental
study carried out on a HPS prototype working with R407C. Annual simulations of the HPS coupled to a hotel are run in order
to evaluate annual performance and energy consumption of the system. The results are compared to the ones of a standard reversible
HP. Depending on the scenario, savings in electric energy consumption and annual performance improvement can reach respectively
55% and 19%. |
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