The application of air-cooled heat pump type air-conditioning unit under low temperature environment of fluid machinery Liu Yingyun, Nanhua University, improved the evaporation temperature of air-cooled heat pump air-conditioning units in low temperature environment, and verified its feasibility by calculation.
The air-cooled heat pump air conditioning unit has the dual functions of cooling in the summer and heating in the winter and is therefore favored by more and more users. However, its application is also subject to some restrictions, such as: In some places in winter, due to low outdoor air temperature, the evaporator surface is susceptible to frost, which affects its normal heating; as the outdoor air temperature decreases, the room heat The load is gradually increased, but the heating capacity of the air-conditioning unit is gradually reduced to meet the user's requirements. Therefore, improving the heating capacity of air-cooled heat pump-type air-conditioning units in a low-temperature environment has become a research topic that has attracted people's attention in recent years and has also published a number of related papers. 112. However, these are all operated in a low-temperature environment with winter evaporators. Research conducted on the premise. For split-type air-cooled heat pump air-conditioning units, this issue should be explored from another perspective: By increasing the operating temperature (evaporation temperature) of the outdoor unit (evaporator), the heating coefficient of the air-conditioning unit will be increased to achieve an increase. The purpose of heat capacity. This article will discuss this.
1 Research Ideas and Measures Taken When the split air-cooled heat pump air-conditioning unit is heated in winter, the heat exchanger of the outdoor unit acts as an evaporator and absorbs the heat of the ambient air. Usually, the outdoor heat exchanger is arranged in the outer space of the building (outdoor layout). Therefore, as the outdoor temperature decreases, the evaporation temperature also decreases, so that the heating coefficient of the unit decreases and the heating capacity decreases. If the outdoor unit's suction temperature can be increased in the outdoor low-temperature environment, the evaporation temperature can be increased to increase the heating capacity and meet the heating requirements. For this reason, the author believes that the following measures can be taken: Place the outdoor heat exchanger of the split-type air-cooled heat pump type air-conditioning unit in the “small room†of the building’s roof “small room†or elsewhere, and arrange another air heat exchanger inside. The part of the low-temperature ambient air that will flow through the evaporator is exchanged with part of the return air (or exhaust) to increase the suction temperature of the evaporator, thereby increasing the evaporation temperature of the unit. Shown is a roof-specific "small room" equipment layout.
As shown, the air supplied to the outdoor unit (evaporator) is introduced into the ventilation outlets provided on the east and west sides of the roof “small roomsâ€. Part of the air passes through the heat exchanger to increase the temperature and increase the intake temperature of the outdoor unit. , thereby increasing the evaporation temperature of the unit. As shown in the system diagram of the indoor unit and the heat exchanger, the heat required for the temperature increase of the introduced outdoor air is supplied by part of the indoor return air (or exhaust air). The layout of the outdoor unit is shown as follows: a ventilation fan for the small room is added to ensure the ventilation required by the outdoor unit. The exhaust port faces outwards. The upper and lower sides and the sides between the unit and the exhaust outlet of the external wall are surrounded by heat insulation materials to ensure the unit row. All gas is discharged outside the "small room." In order to maintain a certain temperature in the 'small room', of course, insulation measures must also be taken to the small room enclosure to make it have a certain heat transfer resistance.
Indoor and outdoor air indoor unit. Heat Exchanger System Indoor Unit 15 Received Date: 2000 The outdoor unit of the split-type air-cooled heat pump air-conditioning unit is placed in the “small room†of the roof “small room†or elsewhere, and can be greatly improved during winter operation. Its evaporation temperature (about 6°C) increases the heating capacity of the air conditioning unit when operating in a low temperature environment. Of course, the outdoor unit evaporating temperature (when heating, the evaporating temperature is lower than the evaporator's suction temperature by 12~15°C) and the temperature difference of the low temperature environment, and the size of the “small room†to arrange the outdoor unit, thermal insulation performance and outdoor Unit configuration, capacity, etc.
With the rapid economic development, split-type air-cooled heat pump air conditioners (generators) are widely used in the Yangtze River basin and its areas south of the country. However, due to limitations in outdoor air temperature and imperfections in defrosting technology, it has limited its application in a wider area, and it has conducted studies to improve the intake air temperature of outdoor units in low-temperature environments and discussed its economy, which may be a practical one. There are also far-reaching issues.
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