CO2 heat pump system

Abstract

The invention relates to a CO2 heat pump system. The CO2 heat pump system comprises a heat pump and a heat pump defrosting device utilizing electrically-heated anti-freeze liquid for defrosting of a heat pump evaporator coil pipe. The heat pump defrosting device comprises a liquid storage box, anti-freeze liquid, a heating device and an infusion pipe. The anti-freeze liquid is contained in the liquid storage box. A liquid inlet and a liquid outlet of the liquid storage box are connected through the infusion pipe. One part of the infusion pipe is wound around in an evaporator of heat pump equipment, the infusion pipe is provided with a water pump, and the heating device heats the anti-freeze liquid. Due to the fact that the anti-freeze liquid has fluidity and flows circularly, continuous heat energy can be provided, and the phenomenon that the temperature of the local part of the defrosting coil pipe is too high or too low is avoided. The anti-freeze liquid is circularly gathered into the liquid storage box and then gets out all the time, the liquid storage box is provided with a heat preservation layer, heat is gathered in the liquid storage box, heat can be continuously used for next defrosting, and the energy saving efficiency is improved. Due to the fact that the anti-freeze liquid is located in the liquid storage box, the temperature rise of the anti-freeze liquid is fast, heat preservation can be achieved, only the water pump needs to be started when frost melting is needed, and frost melting is faster.

Description

technical field [0001] The present invention relates to a CO 2 A heat pump system belongs to the field of heat pump systems. Background technique [0002] Heat pump equipment will frost during use. Generally, electric heating tubes are used to directly heat the evaporator coil for defrosting. Because the evaporator coil of heat pump equipment has many channels, it is necessary to wear multiple electric heating tubes. It is impossible to detect the temperature of each heating tube, only the temperature of the electric heating tube at the part that is most likely to frost. When defrosting, actually only a part of the evaporator coil has frost, and the electric heating tube close to the frosted evaporator coil has fast heat dissipation and low temperature due to intense heat transfer; but there is no electric heating for the frost layer nearby The tube may have been heated to a very high temperature due to less heat transfer, thus affecting the life of the electric heating tu...

AI Technical Summary

Problems solved by technology

[0002] Heat pump equipment will frost during use. Generally, electric heating tubes are used to directly heat the evaporator coil for defrosting. Because the evaporator coil of heat pump equipment has many channels, it is necessary to wear multiple electric heating tubes. It is impossible to detect the temperature of each heating tube, only the temperature of the electric heating tube at the part that is most prone to frost

When defrosting, actually only a part of the evaporator coil has frost, and the electric heating tube close to the frosted evaporator coil has fast heat dissipation and low temperature due to intense heat transfer; but there is no electric heating for the frost layer nearby The tube may have been heated to a very high temperature due to less heat transfer, thus affecting the life of the electric heating tube

Moreover, the electric heating tube is directly used to heat the defrosting. After the defrosting, the temperature of the electric heating tube is still relatively high, but this part of the heat is not used and is directly lost to the air, resulting in energy loss.

And when the electric heating tube is used to defrost, it takes a certain amount of time for the temperature of the electric heating tube to rise from zero to tens of degrees, and the waiting time is longer

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