| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 101 === The heat pump investigated in this study combines heating and water storage as one apparatus. The condenser coil of heat pump was installed in the water storage so to eliminate the circulation pump for energy saving. A natural heat convection enhancement that separates the paths of hot and cold water flow so to reduce the boundary layer thickness was studied experimentally. A one body package heat pump experiment was set up with the condenser in the water tank, and the compressor, the evaporator and the refrigerant control installed above the water tank so combined into one apparatus.
Tests were carried to heat 200 liters of water from 25oC to 60oC. Temperature Sensors were setup in the tank and on the condenser to study the thermal cline, the natural convection heat transfer coefficient, the heating rate and the coefficient of performance of the heat pump (COP). The experimental results showed that heating 200 liters of water from 25oC to 60oC required a heating time of 88 minutes. The average heating rate of the condenser is 5.56kW. The corresponding natural convection coefficient is 1.34kW/m2oC. The average compressor power was 2.74kW. Thus the average heat pump COP is 2.96. Further experiments on the effects of hot cold flow separation natural convection were conducted. A separation of surrounding the center spiral condenser was installed to prevent the mixing of cold water with the hot water. Three spacing of between the copper tube and the separation were tested, 1cm, 2cm, and 4cm. The respective average water heating natural convection coefficient are 1 .47kW/m2oC, 1.26 kW/m2oC and 1.23 kW/m2oC.
|
|---|
