Defrosting control method of heat pump air conditioner unit

Abstract

The invention discloses a defrosting control method of a heat pump air conditioner unit. According to the outdoor environment temperature T4 of heat pump air conditioner operation, regional defrosting is conducted, and different defrosting control modes are conducted within regions of different temperatures. The outdoor environment temperature T4 during initial heat pump air conditioner operation is divided into N regions, different defrosting control methods are used in all regions, a controller is used for counting the air conditioner regional defrosting number when a machine is started up and heated, a special defrosting mode is conducted when the number reaches n, the entry condition of the special defrosting mode is the same as that of regional defrosting modes, and the exit condition is conducted in accordance with different control rules. By the aid of the method, the defrosting is conducted quickly, the indoor temperature fluctuation is small during defrosting, the heating amount is large and the heating can be conducted continuously. Simultaneously, the defects that the defrosting time is long and the defrosting is not complete due to hot gas bypass at the ultralow temperature are avoided. Users feel comfortable.

Description

technical field [0001] The invention is a defrosting control method of a heat pump air-conditioning unit, which belongs to the transformation technology of the defrosting control method of the heat pump air-conditioning unit. Background technique [0002] During the heating operation of the heat pump air conditioner, the refrigerant exchanges heat with the outdoor air through the outdoor heat exchanger, absorbs heat from the outdoor air and evaporates, and the compressor compresses the low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant vapor, which enters the room. The heat exchanger releases heat; through the indoor heat exchanger, the heat is released to heat the indoor air, so that people can enjoy a more comfortable environment. [0003] Because the outdoor heat exchanger absorbs heat from the outdoor air, the temperature around the outdoor heat exchanger is low, and the water vapor in the air will condense into frost and adh...

AI Technical Summary

Problems solved by technology

[0003] Because the outdoor heat exchanger absorbs heat from the outdoor air, the temperature around the outdoor heat exchanger is low, and the water vapor in the air will condense into frost and adhere to the surface of the outdoor heat exchanger, which affects the heat transfer capacity of the outdoor heat exchanger. Decreased heating capacity, affecting people's comfort

[0004] In order to solve the defrosting problem of air conditioners, most air conditioners currently use four-way valve reversing control. Stop heating and increase people's discomfort; during the defrosting process, because the frost at the bottom of the outdoor heat exchanger is difficult to remove, when the upper part has been defrosted, you must wait until the lower part of the heat exchanger is completely defrosted before you can enter In normal heating operation, the defrosting time is longer; in addition, some enterprises currently use the four-way valve non-reversing defrosting method, but in a relatively low temperature environment, the air supply temperature of the indoor unit is often low during the defrosting process. If the frosting time is too long and the defrosting is not clean, it will affect the operation of the air conditioner in the next cycle, resulting in a vicious circle

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