Abstract
In this research, a water-water heat pump system using waste water as a heat source, a type that is not often used in Turkey and the World, was experimentally modeled. The experiments were performed under the conditions of simulated waste water temperature values of 20 °C, 30 °C and 40 °C. Inlet and outlet water temperatures of the evaporator and condenser, water flow rates in the evaporator and condenser circuits, pressures at the compressor inlet and outlet and power consumption of the system were measured. The heating coefficients of performance were calculated based on the measurements. It was found that the maximum temperature in the energy storage tank was about 50.6 °C. For the heat source temperatures of 20 °C, 30 °C and 40 °C, the heating coefficients of the performance of the system became 3.36, 3.43 and 3.69, respectively, 6 min. after the start time of the experiments and then they were decreased to 1.87, 1.83 and 1.77 with increasing water temperature in the condenser tank. The mean uncertainty value of the measurement parameters was found to be about ±2.47%. Finally, for the purpose of meeting hot water need as well as floor heating system requirements, it is seen that energy quality level of a waste low grade temperature heat source can be increased by using a heat pump system.
Highlights
Heat pump systems are energy-efficient devices for heating and cooling of buildings
In the continental climates during winter season, heat pumps cannot provide the necessary heating needed for the system requirements because of the low atmospheric air temperature and they may become idle during the heating season
Different pump flow rates were presented as CP I, CP II and CP III
Summary
Heat pump systems are energy-efficient devices for heating and cooling of buildings. Ambient air is free and widely available, and it is the most common heat source for heat pumps. The capacity and performance of airsource heat pumps decrease rapidly with decreasing ambient temperature during the heating season, and with increasing ambient temperature during the cooling season [1]. In the continental climates during winter season, heat pumps cannot provide the necessary heating needed for the system requirements because of the low atmospheric air temperature and they may become idle during the heating season. In order to overcome this problem, heat pumps can be used efficiently in colder climates by using some warmer waste heat source instead of the atmospheric ambient one. The average wasted warm water temperature such as found in restaurants, laundries, dormitories, textile industry facilities and etc. varies in the range of 20–40 °C throughout the year
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