Influence of the Thermal Energy Storage Strategy on the Performance of a Booster Heat Pump for Domestic Hot Water Production System Based on the Use of Low Temperature Heat Source

Ximo Masip, Emilio Navarro-Peris and José M. Corberán
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Ximo Masip: Instituto Universitario de Investigación en Ingeniería Energética (IUIIE), Universitat Politècnica de València, 46022 València, Spain
Emilio Navarro-Peris: Instituto Universitario de Investigación en Ingeniería Energética (IUIIE), Universitat Politècnica de València, 46022 València, Spain
José M. Corberán: Instituto Universitario de Investigación en Ingeniería Energética (IUIIE), Universitat Politècnica de València, 46022 València, Spain

Energies, 2020, vol. 13, issue 24, 1-24

Abstract: Energy recovery from a low temperature heat source using heat pump technology is becoming a popular application. The domestic hot water demand has the characteristic of being very irregular along the day, with periods in which the demand is very intensive and long periods in which it is quite small. In order to use heat pumps for this kind of applications efficiently, the proper sizing and design of the water storage tank is critical. In this work, the optimal sizing of the two possible tank alternatives, closed stratified tank and variable-water-volume tank, is presented, and their respective performance compared, for domestic hot water production based on low temperature energy recovery in two potential applications (grey water and ultra-low temperature district heating). The results show that the efficiency of these kind of systems is very high and that variable-water-volume tanks allow a better use of the energy source, with an 8% higher exergy efficiency and around 3% better seasonal performance factor (SPF), being able to provide similar comfort levels with a smaller system size.

Keywords: domestic hot water DHW; heat pump; thermal energy storage TES; waste heat; exergy analysis; ultra low temperature district heating; energy efficiency; size optimization (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 (1)

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