Numerical analysis of the combination of radiative collectors and emitters to improve the performance of water-water compression heat pumps under different climates

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Vilà Miró, RogerVilà Miró, Roger - ORCID ID
Medrano Martorell, MarcMedrano Martorell, Marc - ORCID ID
Castell, AlbertCastell, Albert - ORCID ID
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cc-by-nc-nd (c) Roger Vilà, Marc Medrano, Albert Castell, 2023
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Radiative cooling allows to cool down surfaces in a renewable way. It can be combined with solar collection functionality to produce heat and cold in a single device known as Radiative Collector and Emitter (RCE). In this paper we propose to combine a RCE with compression heat pumps to improve its performance, producing both heat and cold. Two combined systems are studied: a peak load shifting configuration where radiative cooling and cold production for demand occur simultaneously, and a decoupled configuration with an intermediate tank. The research numerically simulates both systems in different cities and climates, and compares them to a reference system based on a conventional heat pump. The results reveal and improvement of the performance in both configurations: a greater performance of the heat pump is found in the intermediate tank configuration; but after considering the electrical consumptions of all components of the system, peak load shifting configurations exhibit the best performance in most of the cities. Denver, Lleida and Rome – cities with dry climate and moderate cooling requirements – are the top cities with the greatest improvement of the performance. In the solar heating mode, the facilities show an underutilization of the collection field.
Journal or Serie
Energy, 2023, vol. 266, 126445