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    Why air source heat pump frosts and Solutions

    Author: Lucy, source: Zhengxu air energy, published on: December 19, 2015, click: 2828
       Air source heat pump There is a certain relationship between the efficiency and the defrosting speed, so the causes and effects of air source heat pump frosting? How should we deal with the defrosting problem of air source heat pump? The following by the green to give you an analysis.


     Why air source heat pump frosts and Solutions

    Causes of abnormal frosting of air source heat pump:

    1. When the outdoor environment temperature is higher than 0 ℃, the dew on the surface of the heat sink on the whole heat exchanger will condense into thin frost, and the frost will become thicker and thicker soon. The thermal effect of indoor mechanism is poor, and the phenomenon of defrosting is frequent. This fault is usually caused by the surface of the heat sink on the outdoor heat exchanger is dirty and blocked, the outdoor fan system is faulty, or the air inlet and outlet of the outdoor heat exchanger are blocked.

    The results show that the temperature of the outdoor air cooler is higher than that at the bottom of the air conditioner.

    3. When the outdoor environment temperature is higher than 0 ℃, the upper part of the outdoor side heat exchanger (the outlet of the heat exchanger and the return pipe) frosts very thick, and the frost on the heat exchanger extends from top to bottom (with the outlet of the heat exchanger to the inlet of the heat exchanger) with time delay; the heating effect is poor; the air conditioner defrosts frequently. The fault is usually too much refrigerant in the system, which often occurs after maintenance and adding refrigerant.

    What is the effect of frosting on air source heat pump?

    1. The passage between fins is blocked to increase air flow resistance

    2. Increasing the heat resistance of the heat exchanger will reduce the heat transfer capacity

    3. The defrosting process is a process of air conditioning operation, not only can not make hot water, but also need to consume the energy consumption of the original hot water. The discharged frozen water flushes back into the heat preservation water tank, resulting in further drop of water temperature

    4. The evaporation temperature decreases, the energy efficiency ratio decreases, and the heat pump performance deteriorates until it can not work normally.  

    5. As the unit can not work normally, it will directly cause economic losses to customers, until the fear of heat pump products is generated, which affects their consumption choice.  

    Defrosting method of air source heat pump:

    1. The fan speed can be increased and the exhaust air volume can be increased. The frosting process is that the steel pipe frosts first, then the evaporator fin frosts, and then the inner side of the evaporator frosts.

    2. With the increase of heat exchange area, the temperature difference between evaporation temperature and ambient temperature is relatively small, so it is not easy to frost.

    3. Use small circulation system to make the unit rest. At the same time, it can ensure that the heat storage tank has enough hot water temperature and improve the energy efficiency ratio, but the cost is increased.

       Air source After the heat pump defrosting is solved, the next pipeline insulation should also be paid attention to.
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