Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data

Roberto Bruno, Francesco Nicoletti, Giorgio Cuconati, Stefania Perrella and Daniela Cirone
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Roberto Bruno: Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy
Francesco Nicoletti: Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy
Giorgio Cuconati: Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy
Stefania Perrella: Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy
Daniela Cirone: Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), Italy

Energies, 2020, vol. 13, issue 13, 1-19

Abstract: The spread of near-Zero Energy Buildings (nZEB) involves the employment of high performant air-conditioning plants where renewable sources can be integrated easily. In this context, heat pumps appear as a promising solution given their ability to exploit aerothermal, hydrothermal and geothermal sources and to supply both heating and cooling loads with the same device. In order to evaluate the energy performances in transient conditions, the actual winter ( COP ) and summer ( EER ) performance indexes, in the function of the sources’ temperatures and the capacity ratio ( CR ), have to be available. Nevertheless, heat pump manufactures often provide the trend of the performance indexes in the function of the temperatures of the sources specifically for nominal conditions, whereas the dependence of the performance indexes in the function of CR , that takes into account the part-load operation, is almost always not provided. Alternatively, specific technical standards suggest the use of a correction factor to modify nominal COP and EER for the attainment of the real performance indexes. In this paper, by using data from an experimental set-up equipped with air-water heat pumps, these correlations were tested and tuned. Winter results showed that correction factors suggested by standards have to be modified in the presence of a storage system. In summer, instead, a new correlation was developed to find a function between nominal and actual EER s in the function of CR by exploiting a similar approach employed for the COP calculation.

Keywords: heat pumps; capacity ratio; COP and EER; dynamic energy performances (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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