Why does the air-energy heat pump frost?

As the heat carrier of nature, the problem of frost on the external unit of the air-energy heat pump is a common problem in the industry. So, why does the air-energy heat pump freeze during operation?

One of the reasons for frost during the operation of the air-energy heat pump: unreasonable system installation and matching

Many heat pump projects adopt a large-circulation installation method, using hot water on one side and cold water on the other. The unit runs at low temperature for a long time, resulting in frost.

The second reason for frosting during operation of air-energy heat pump: lack of necessary environmental simulation experiments

The engineering design of air-energy heat pump hot water units should take into account the use levels in different environments and regions, and formulate different defrosting parameters. For example, defrosting time, defrosting start temperature, and defrosting end temperature all need to be set differently according to the minimum temperature and humidity in different regions.If the manufacturer has limited capabilities and lacks environmental simulation test equipment, it is difficult to test the unit under various conditions. As a result, it is also difficult to accumulate relevant technological expertise.

The third reason for frosting during the operation of air-energy heat pumps: wrong mode setting

The design and selection of summer working conditions are used in winter. In the cold winter, the air-energy heat pump will have insufficient water production. When the heating efficiency of the unit decreases and it runs for a long time, it may even be stopped by the automatic protection program, thus affecting the normal water use and the use of users.

The fourth reason for frosting during the operation of air-energy heat pumps: insufficient exhaust volume

The air-energy heat pump hot water unit should be used normally in cold areas in winter. If the temperature is too low and the humidity is high, it is necessary to increase the ventilation volume of the unit or adopt auxiliary electric anti-icing methods, and optimize the defrosting program according to the characteristics of the region, and carry out scientific and reasonable careful design and installation deployment. In this way, the air-energy heat pump hot water unit can meet the needs of users even in the cold winter.