Enhanced vapor injection air conditioning system and defrosting control method thereof

Abstract

The invention discloses an enhanced vapor injection air conditioning system. The enhanced vapor injection air conditioning system comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor and a four-way reversing valve. The compressor comprises a liquid storage tank and is provided with an air exhaust port, an air supplement port and an air suction port. The oil storage tank is provided with an air return port communicating with the air suction port. The four-way reversing valve is provided with a first end, a second end, a third end and a fourth end, wherein the first end communicates with the air exhaust port of the compressor, the second end is connected with an inlet of the indoor heat exchanger, the third end is connected with an outlet of the outdoor heat exchanger, and the fourth end communicates with the air return port. The air conditioning system further comprises a bypass loop, and the bypass loop is connected between the air exhaust port of the compressor and the outdoor heat exchanger and comprises a control valve. The invention further discloses a defrosting control method. When the method is adopted for defrosting, the heating effect is not influenced, moreover, the indoor environment temperature can be stabilized, reversing actions of the four-way reversing valve are reduced, and therefore equipment reliability is improved, and the use comfort level is increased for users.

Description

technical field [0001] The invention relates to the technical field of refrigeration and heating, in particular to an air-injection enthalpy-increasing air-conditioning system and a defrosting control method thereof. Background technique [0002] Heat pump air conditioners can not only cool in summer, but also heat in winter, so they are widely welcomed by users. During the heating process, due to the low outdoor ambient temperature and high humidity, frosting is prone to occur. If the air conditioner is severely frosted, the air conditioning system will automatically execute the defrosting action. When the defrosting time is set too short, it will cause The defrosting of the outdoor unit is not clean, which affects the heating effect, increases the power consumption of the user, and reduces the energy efficiency; and when the defrosting time is set too long, the comfort of the user will be greatly reduced, and there may be When defrosting occurs, cold air is blown into the...

AI Technical Summary

Problems solved by technology

During the heating process, due to the low outdoor ambient temperature and high humidity, frosting is prone to occur. If the air conditioner is severely frosted, the air conditioning system will automatically execute the defrosting action. When the defrosting time is set too short, it will cause The defrosting of the outdoor unit is not clean, which will affect the heating effect, increase the power consumption of the user, and reduce the energy efficiency; and when the defrosting time is set too long, the user's comfort will be greatly reduced, and there may be When defrosting occurs, cold air is blown into the room. Therefore, it is necessary to change the defrosting control method to solve this problem.

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