What are the factors that affect the operation of air source heat pump?
Sep 25th,20201960 Visualizzazioni
parameters of evaporator It is mainly the total fin area of the evaporator, which determines the basic ability of the evaporator to contact with air and realize heat exchange. Compared with the input power of the system, the smaller the evaporator is, the earlier the frost layer is formed and the faster the frost layer is thickened.
Wind speed Refers to the speed of air flowing through evaporator, which is one of the important factors affecting frost formation. The fan configuration of air source heat pump should not be too small, otherwise it will get frosted out of the line ahead of time, and the increase of frost layer thickness will be accelerated. In extreme cases, even in mild spring and autumn, if the temperature is above 10℃ and the wind speed is too low, frost will still appear, and even at 20℃ when the fan is damaged and the unit can stop.
evaporator fin pitch The size of sheet spacing affects the continuous working ability of evaporator after frosting; Frost layer will narrow the passage of air flowing between fins. Under the condition of constant fan speed, the air flow rate will decrease. At this time, the evaporator's ability to capture heat will decrease due to the decrease of air flow rate and the increase of heat transfer resistance, which will eventually lead to a significant decrease or even loss of the heating capacity of the unit.
Cleanliness of evaporator surface Dirt will hinder the transfer of heat into the evaporator, which will further reduce the evaporation temperature of the evaporator, thus promoting the formation and development of frost layer; In addition, the layout of evaporator also has a certain degree of influence on frosting: the wind speed is different in each area of evaporator fins, and the wind speed varies greatly in some poorly designed structures. If the wind speed in some areas is less than 1M/S, the frost layer will generally expand in these places with low wind speed, and this phenomenon will often occur in the manufacture of oversized top-outlet air heat pump units. In the upper area of evaporator near the fan, the wind speed is higher, while in the lower area far away from the fan.
Controller Under the condition of only temperature and time parameters, it is almost impossible to judge the frosting situation correctly. The production speed of frost layer is related to many factors, such as air temperature, heat exchange with evaporator, refrigerant charge and so on, especially the humidity of the atmosphere, which varies greatly in different seasons and regions, so it is difficult to judge the frosting situation by the change of temperature.
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