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How should the air source heat pump defrost in the cold winter?

January 07, 2020 09:06:18 Source: Pharmaceutical Network Popularity: 7424


[ Food Machinery Equipment Network Industry Trends ] With the development of air source heat pump technology, air source heat pump machines have gradually entered the public's field of vision. Air source heat pump has a high degree of automation technology, safety and reliability, energy saving, low use cost, and has multiple advantages such as easy operation and good heating effect. It has the reputation of "porter of natural energy" and is used in hospitals, hotels and other occasions. widely.
Air source heat pump is based on the energy in ubiquitous air as the main power. The compressor is driven by a small amount of electrical energy to achieve energy transfer. With the continuous promotion of environmental protection policies, air source heat pump can gradually reduce the traditional heating supply. The pollution brought by the atmospheric environment guarantees the heating effect and achieves the purpose of energy conservation and environmental protection.
In the process of use, the user needs to operate the air source heat pump properly and reasonably to make it play a stable role. However, many users said that when the air source heat pump is used correctly, there are still some problems that are difficult to solve, such as the frost problem of the air source heat pump unit.
It is understood that there are many reasons for frosting in conventional air-source heat pump units, including poor water flow in the water trap and ice spread to the evaporator ; lack of fluorine or system blockage; fan motor failure or fan air volume configuration is too small; refrigerant flushing The fluence is too small; uneven distribution of cold submergence; irrational structural design. Different frost causes have different response aspects.
At present, it is entering cold winter, especially in the northern region of China. In the process of using air-source heat pump, it is inevitable that the equipment will frost due to the influence of low temperature weather.
The industry indicates that the air source heat pump absorbs heat from the air, and the evaporation temperature of the refrigerant is very low. When the refrigerant passes through the evaporator, it will absorb the heat in the air. When the temperature of the evaporator is lower than the dew point of the air, water will condense on the surface of the evaporator. If the ambient temperature is also close to or lower than 0 ° C, it is easy to form frost on the surface of the evaporator. If the host frosts, you need to defrost it thoroughly. Otherwise, the host will freeze, and it will freeze more and more, entering a vicious circle, causing the host to fail to work properly.
So, in this kind of frost, what are the ways to defrost? The author has summarized this briefly, and it is for industry reference only.
Frost sensor method
The frost layer sensor method is a method for performing defrosting control by detecting the thickness of the frost layer. The principle of this method is simple, but it involves high-gain signal amplifiers and expensive sensors, so it is feasible as a test method, and the practical application is economical.
Timing control
The timing control method, as the name implies, performs defrost control according to a preset time. However, this method is prone to produce unnecessary defrosting actions and cause unnecessary waste.
Average heating method
The industry indicates that for a certain atmospheric temperature, there is a unit with a corresponding evaporation temperature, and the average heating capacity of the unit is relatively large at this time. The defrost control is performed with the goal of the large heating effect that the heat pump unit can produce. This defrosting method has theoretical significance, but it is difficult to implement.
Time-temperature method
When the defrost detection element feels that the surface temperature of the finned tube of the heat exchanger and the heating time of the heat pump unit have reached the set values, the defrost starts. It is reported that because the coil temperature is set to a fixed value, this method cannot take into account the changes in ambient temperature and humidity, which is prone to erroneous operations, and this method is more sensitive to the installation position of the temperature sensor.

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