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Open AccessArticle

Experimental Research of a Water-Source Heat Pump Water Heater System

School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212000, China
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Energies 2018, 11(5), 1205; https://doi.org/10.3390/en11051205
Received: 9 April 2018 / Revised: 3 May 2018 / Accepted: 5 May 2018 / Published: 9 May 2018
(This article belongs to the Special Issue District Heating)
The heat pump water heater (HPWH), as a portion of the eco-friendly technologies using renewable energy, has been applied for years in developed countries. Air-source heat pump water heaters and solar-assisted heat pump water heaters have been widely applied and have become more and more popular because of their comparatively higher energy efficiency and environmental protection. Besides use of the above resources, the heat pump water heater system can also adequately utilize an available water source. In order to study the thermal performance of the water-source heat pump water heater (WSHPWH) system, an experimental prototype using the cyclic heating mode was established. The heating performance of the water-source heat pump water heater system, which was affected by the difference between evaporator water fluxes, was investigated. The water temperature unfavorably exceeded 55 °C when the experimental prototype was used for heating; otherwise, the compressor discharge pressure was close to the maximum discharge temperature, which resulted in system instability. The evaporator water flux allowed this system to function satisfactorily. It is necessary to reduce the exergy loss of the condenser to improve the energy utilization of the system. View Full-Text
Keywords: water-source heat pump water heater; cyclic heating; evaporator water flux; exergy analysis water-source heat pump water heater; cyclic heating; evaporator water flux; exergy analysis
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MDPI and ACS Style

Zhao, Z.; Zhang, Y.; Mi, H.; Zhou, Y.; Zhang, Y. Experimental Research of a Water-Source Heat Pump Water Heater System. Energies 2018, 11, 1205.

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