Enhanced vapor injection system and operation method thereof

Abstract

The invention provides an enhanced vapor injection system and an operation method thereof, and the system comprises a temperature detection module which is used for detecting the inlet temperature of an auxiliary road, the outlet temperature of the auxiliary road, the outdoor environment temperature T1, the middle temperature of an indoor heat exchanger and the middle temperature of an outdoor heat exchanger; the data processing module is used for converting the pressure Pm of the working medium in the two-phase region of the pressure enthalpy diagram according to the inlet temperature of the auxiliary path; the control module adjusts the opening degree of the first throttling valve and / or the second throttling valve according to the comparison result of the outdoor environment temperature T1 and the preset temperature and the comparison result of the specific value of the pressure Pm and the target intermediate pressure Pm0 and the preset specific value. The energy efficiency of the system can be ensured to be within a better energy efficiency range, the energy efficiency and reliability of the system are improved, and the control precision of the throttle valve is improved.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to an air jet enthalpy increasing system and an operating method thereof. Background technique [0002] Existing air conditioners will use plate heat exchangers when they want to realize the main path subcooling and jet enthalpy increase technology. The plate heat exchanger has the main path inlet and outlet and the auxiliary path inlet and outlet. Generally, the liquid is taken as the auxiliary path after the main path is supercooled. . The temperature change in the air-conditioning system is relatively slow, and controlling the opening of the throttle valve by the superheat cannot fully exert the effect of increasing the enthalpy of the jet. [0003] If the auxiliary circuit of the plate heat exchanger takes liquid after the main circuit is subcooled during cooling, the auxiliary circuit of the plate heat exchanger must take liquid before the main circuit is subcooled during heati...

AI Technical Summary

Problems solved by technology

The temperature change in the air conditioning system is relatively slow, and the opening degree of the throttle valve can not be fully exerted by using the superheat to increase the enthalpy of the air injection

[0003] If the auxiliary path of the plate heat exchanger takes liquid after the main path is overcooled during cooling, then the auxiliary path of the plate heat exchanger must take liquid before the main path is overcooled during heating, which may cause the refrigerant at the inlet of the auxiliary path to be in a gas-liquid two-phase state. When throttling, the throttling parts are intermittently blocked, which seriously affects the throttling effect of the auxiliary road; taking liquid before throttling will also cause insufficient or no supercooling of the main road, which cannot improve the cooling or heating of the system effect, losing the purpose and function of the technology itself

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