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Experimental Study on Dynamic Performance of Air Source Heat Pump under Frosting Conditions

Author: LiuGuoWei
Tutor: YaoYang
School: Harbin Institute of Technology
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Air source heat pump Frost Dynamic performance Experimental study
CLC: TU831.7
Type: Master's thesis
Year: 2007
Downloads: 236
Quote: 2
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Abstract


With world energy structure adjustment and global sustainable development strategy put forward, there is growing emphasis on the development and utilization of clean, safe, efficient energy. Air source heat pump system electric energy as the driving force, the outdoor ambient air as cold, heat, cold, heat the object to be adjusted. This environmentally-friendly and efficient energy supply in the low energy use has a clear competitive advantage. The use of air source heat pump split type room air conditioner is very popular. But the effect of the actual operation of the air source heat pump, low temperatures and relative humidity relatively large area heating operation is still not ideal, frosting and defrosting of the outdoor heat exchanger in heating run impact on air source heat pump running in winter is an important issue. When the outdoor heat exchanger surface frost will reduce the heat transfer coefficient of the heat exchanger, to increase the flow resistance of the air-side, reducing the heating capacity of the air source heat pump. How to prevent or delay the outdoor heat exchanger frost and how to select the defrost control issues of general interest. To do this, it should be in-depth study of the law of air source heat pump frost and frost on heat pump performance. In this paper, experimental studies of air source heat pump in frosting conditions of dynamic performance, their performance in the frosting conditions was investigated experimentally explore the performance of air source heat pump outdoor heat exchanger frost affected. The evaporation temperature, the compressor suction pressure, discharge pressure, the compressor shaft power, the power of the outdoor fan, heat capacity, and other parameters are measured in experiments in different conditions and with increasing running time of the changes, on this basis, analysis of the impact of environmental parameters on the total heating capacity, energy efficiency. This provides a basis for the heat pump air conditioner defrost control and design optimization. Experimental results show that: (lt; 75%) in the low relative humidity conditions, the outdoor heat exchanger fin surface basic non-frost; stable operation of the heat pump air conditioner, the dynamic parameters did not change significantly; relative humidity higher (GT; 80%) conditions, the surface of the fins of the outdoor heat exchanger frost, and the greater the relative humidity, the the frosting phenomenon is more serious, and various dynamic parameters corresponding changes significantly. Also in the harsh conditions of relative humidity greater than 95%, the frost of the outdoor heat exchanger of a heat pump air conditioner is very serious, and very rapidly, obviously a variety of dynamic parameters change, the heat pump heating capacity and COP value decreased rapidly; It is necessary to study them in depth in the harsh conditions frosting and defrosting of the heat pump. Part of the subject \

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning > A variety of air conditioners
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