Summary
A storage heat pump water heater (HPWH) comprises a vapor compression system and a hot water tank. It can lead to more than 70% energy saving, compared with electric resistance heating. HPWH usually uses a wrapped-tank coil as the water heater. The wrapped coil has a strong interaction with the water tank and impose a new challenge for the engineering design and simulation study. Based on the US DOE/ORNL Heat Pump Design Model (HPDM), i.e., a public-domain, component-based thermal system modelling platform, a segment-to-segment wrapped-tank coil model coupled with a one-dimensional stratified water tank model were developed, which facilitates modeling and design HPWHs having various configurations and components. The hardware-based design model was used to evaluate refrigerants having lower global warming potentials to replace R-134a, including R-1234yf, R-1234ze, R-290, R-513A and R-450A, when effects of compressor size, refrigerant charge on 24-hour uniform energy factor (UEF) and first-hour rating (FHR) were investigated.
In the drop-in replacements, R-1234ze achieved the best UEF, and R-290 resulted in the lowest UEF. When downsizing the compressor to maximize the UEFs, the UEFs of R-134a, R-290, R1234yf, R-450A and R-513A ascended to the range of 4.4 to 4.53, with R-513A having the highest UEF. The R-1234ze ended up having the lowest UEF of 4.27. Refrigerants having larger volumetric vaporization heat led to higher FHRs if using the fixed-size compressor, that R-290 resulted in the highest FHR.
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Details
- Original title: Parametric studies of heat pump water heater using low GWP refrigerants.
- Record ID : 30029147
- Languages: English
- Subject: HFCs alternatives
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 131
- Publication date: 2021/11
- DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.07.015
- Document available for consultation in the library of the IIR headquarters only.
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Indexing
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Themes:
Residential heat-pumps;
HFCs;
HFO et HCFO;
Hydrocarbons - Keywords: Domestic heat pump; Water heater; Low GWP; Steady state; Simulation; Modelling; Drop-in; R134a; R290; R1234yf; R1234ze; R513A; R450A; Refrigerant charge
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- Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
- Formats : PDF
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- Source: 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
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