Air conditioning system with coolant supercooling, defrosting and heating functions and control method thereof

Abstract

The invention discloses an air conditioning system with coolant supercooling, defrosting and heating functions and a control method thereof. The air conditioning system comprises an outdoor unit and an indoor set. The indoor set comprises at least one indoor unit; the outdoor unit comprises a compressor, an outdoor heat exchanger, an outdoor throttle device and a four-way valve; each indoor unit comprises an indoor heat exchanger and an indoor throttle device; the air conditioning system further comprises a heat exchanger; the heat exchanger comprises a first coil and a second coil; two ends of the first coil are communicated with the outdoor throttle device and the indoor throttle devices; one end of the second coil is communicated with the outdoor throttle device, and the other end of the second coil is communicated with the intake end of the compressor. The air conditioning system allows secondary supercooling of coolant and supplies heat for the indoor units during defrosting; the air conditioning system further comprises a modular heat exchanger connected with a compressor drive module, and energy is recovered during 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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