Energy and techno-economic assessment of the effect of the coupling between an air source heat pump and the storage tank for sanitary hot water production

•An experimentally tested and fully characterised HP model in TRNSYS was developed.•An indirect coupling between the HP and SHW tank means up to 30% of inefficiency.•The double wall condenser is the most efficient and cost effective type of coupling. Heat pumps are proved to be a highly efficient te...

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Bibliographic Details
Published in:Applied thermal engineering 2019-08, Vol.159, p.113853, Article 113853
Main Authors: Masip, X., Cazorla-Marín, A., Montagud-Montalvá, Carla, Marchante, J., Barceló, F., Corberán, J.M.
Format: Article
Language:English
Subjects:
Coils
Coupling
Drinking water
Energy efficiency
Energy optimization
Heat exchangers
Heat pump
Heat pumps
Heat transfer
Hot water heating
Pumps
Sanitary hot water production
Storage tanks
Techno-economic assessment
Thermal energy storage
Water pollution
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Summary:•An experimentally tested and fully characterised HP model in TRNSYS was developed.•An indirect coupling between the HP and SHW tank means up to 30% of inefficiency.•The double wall condenser is the most efficient and cost effective type of coupling. Heat pumps are proved to be a highly efficient technology for sanitary hot water production. However, when installing them coupled with the storage tank, an inefficiency up to 30% can be introduced in the system since this coupling cannot be direct according to EN 1717:2000; in order to prevent from any potential pollution of potable water in case of a refrigerant leakage. This research work evaluates three types of indirect coupling in the case of an air source heat pump system for sanitary hot water production: a coil heat exchanger inside the storage tank (CC), an intermediate heat exchanger between the tank and the heat pump (EHXC) and a double wall condenser (DWCC). A techno-economic assessment was carried out for the representative climate conditions around Europe. Results show that the DWCC is always the most efficient and cost-effective solution with a 3.66% lower energy efficiency than the direct coupling (Base Case), whereas the CC is not only the less efficient solution (27.1% lower than the Base Case) but also the less cost-effective, with a 50% lower net present value than the DWCC.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2019.113853