Control method for defrosting through electric heating

Abstract

The invention provides a control method for defrosting through electric heating. After start-up running is conducted for a period of time, hot anti-freeze liquid is provided to be used later when an evaporator coil pipe is about to be frosted, and when the evaporator coil pipe is frosted, the hot anti-freeze liquid is conveyed for frost melting and defrosting till the temperature of the evaporator coil pipe is increased to the set temperature, then, conveying of the anti-freeze liquid is stopped, and the defrosting work is completed. Due to the fact that the hot anti-freeze liquid is prepared in advance to be used later, when the evaporator coil pipe is frosted, conveying of the hot anti-freeze liquid can be rapidly conducted for frost melting and defrosting, and the defrosting efficiency is high; and meanwhile, when the evaporator coil pipe is about to be frosted, the hot anti-freeze liquid is provided, heat losses of the anti-freeze liquid can be reduced as much as possible, and the energy saving efficiency can be improved.

Description

technical field [0001] The invention relates to a defrosting control method, in particular to a defrosting control method using electric heating, and belongs to the field of heat pump defrosting methods. 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...

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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