Detailed decomposition of air-cooled heat Pump Unit selection

Air-cooled Heat pump unitThe current products are mainly domestic heat pump air conditioners, commercial unit-type heat pump air-conditioning units and heat pump hot and cold water unit. Heat pump air conditioner has accounted for the 40~50% of household air-conditioner sales, with an annual output of more than 4 million units. Heat pump hot water unit since the beginning of the 90, in hot summer and cold winter area has been widely used, according to incomplete statistics, the region's central air-conditioning heat and cold source of hot water pump has accounted for 20~30%, and the scope of application continues to expand and has moved to this trend.

1. Evaluation of air source heat pump energy consumption

In order to evaluate and compare the energy consumption of air-cooled heat pump units with other heating and cooling equipment, about 30 papers are involved in this problem. This paper introduces the theory and software for energy consumption analysis of air cooled heat pump unit, according to the parameters of air conditioning cold load, outdoor dry bulb temperature and heat pump effluent temperature, the bin number method is used to solve the annual energy consumption of heat pump cooling. When solving the heat pump energy consumption in winter, in addition to considering the air conditioning heat load, heat pump effluent temperature, outdoor dry bulb temperature, the outdoor relative humidity (that is, temperature and humidity frequency) take into account the heat pump performance, the Software engineering example calculation, and actual energy consumption has a good agreement, for energy consumption evaluation provides a method.

2. Selection of air-cooled heat pump unit

At present, the design selection of air-cooled heat pump units, often based on the calculation of the heat and cold load, considering the use coefficient and cold (heat) loss coefficient, according to the Unit nameplate calibration Value selection unit number. Because the air source heat pump Unit's Cold (heat) quantity changes with the outdoor parameter change, this choice method may cause the unit to choose too big, causes the waste, or chooses too small, causes the cooling (hot) quantity insufficient, cannot reach the use request. For this reason, it is suggested that the time varying curve of air conditioning heating and cooling capacity of heat pump unit should be adopted, and the results will be more satisfactory.