Air-conditioning system with refrigerant supercooling, defrosting and heating functions and its control method

Abstract

The invention discloses an air-conditioning system with functions of refrigerant supercooling, defrosting and heating, and a control method thereof, including an outdoor unit and an indoor unit, the indoor unit includes at least one indoor unit, the outdoor unit includes a compressor, an outdoor replacement Heater, outdoor throttling device and four-way valve, the indoor unit includes an indoor heat exchanger and an indoor throttling device, the air conditioning system also includes a heat exchange device; the heat exchange device is provided with a first coil and The second coil; both ends of the first coil communicate with the outdoor throttling device and the indoor throttling device respectively; one end of the second coil communicates with the outdoor throttling device, and the other end communicates with the air intake of the compressor end connection. The air-conditioning system uses one device to realize the secondary subcooling of the refrigerant at the same time, and realizes the heat supply to the indoor unit while defrosting during the defrosting process; the air-conditioning system is also provided with a module connected to the compressor driving module Heat exchanger for energy recovery while cooling the compressor drive module.

Description

technical field [0001] The invention relates to the technical field of air-conditioning refrigerant supercooling, defrosting and heating, in particular to an air-conditioning system with the functions of refrigerant supercooling, defrosting and heating and a control method thereof. Background technique [0002] When the air conditioner is cooling, when the outdoor temperature is too high, the refrigerant coming out of the outdoor heat exchanger is insufficient in subcooling, and the refrigerant in the liquid pipe will flash, resulting in poor cooling effect; when the air conditioner is heating, when When the outdoor temperature is too low, frosting occurs on the outdoor heat exchanger. The traditional air conditioner defrosting operation uses a four-way valve to switch to a refrigeration refrigerant circuit. It will absorb the heat in the room, causing large fluctuations in the room temperature and reducing the comfort of use. [0003] In order to solve the problem of refri...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of indoor temperature drop caused by defrosting, a heat accumulator is designed on the air conditioning system. The heat accumulator can store heat through auxiliary electric heating or high-temperature refrigerant on the side of the compressor when the indoor mechanism is heating. When defrosting, heat is taken from the accumulator for defrosting

[0005] In the existing technology, there are few air-conditioning systems with two functions at the same time. Even if the air-conditioning system needs to have the secondary sub-cooling function and the defrosting function at the same time, it is necessary to add a sub-cooling device and a defrosting function to the existing air-conditioning system. Heat accumulator, this will make the structure of the air conditioning system more complicated, the volume will become larger, and it will lead to an increase in production costs

Moreover, the existing air conditioning system cannot supply heat to the room during defrosting. The best solution is to require the air conditioner to have the function of secondary subcooling of the refrigerant, heat storage and the function of heating the room while defrosting. However, the existing air conditioner system, not only the system design and control are complicated, the cost is high, but also there is the problem that the indoor unit cannot heat during heat storage and defrosting, which reduces the user satisfaction

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