Abstract
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.
Highlights
Energy used for hot water supply is the fourth largest energy user in commercial building sectors, after heating, air conditioning, and lighting
In order to explore the thermal performance of the water-source heat pump water heater (WSHPWH) system, a series of experiments system ran for 64 min, 50 L of water was heated from 28 °C to 57 °C in the tank, indicating that the were conducted under different conditions
System ran for 64 min, 50 L of water was heated from 28 C to 57 C in the tank, indicating that the system ran for 64 min, 50 L of water was heated from 28 °C to 57 °C in the tank, indicating that the experimental prototype was capable of producing hot water
Summary
Energy used for hot water supply is the fourth largest energy user in commercial building sectors, after heating, air conditioning, and lighting. The air-source heat pump water heater has been widely studied and applied due to its comparatively higher energy efficiency and environmental protection. Shu et al [10] conducted a field measurement of a seawater-source heat pump heating system, showing that the energy dissipated by the heat pump units dominated the entire system They analyzed the energy efficiency improvement potential of the heat pump units. Araz et al [13] evaluated the performance of two combined systems, the wastewater-source heat pump (WWSHP) system and building-integrated photovoltaic (BIPV) system, using both energy and exergy analysis methods. This system conserved energy better and consumed less than gas-fired boilers. The system performance was improved after the energy utilization of the condenser was optimized
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