Accurate heat recovery device and method for direct expansion type air conditioning system

Abstract

The invention provides an accurate heat recovery device for a direct expansion type air conditioning system. The accurate heat recovery device of the direct expansion type air conditioning system is easy to install, low in cost, free of increasing the operation cost, and capable of being popularized in a large range. The accurate heat recovery device of the direct expansion type air conditioning system comprises a compressor, a condenser, an evaporator, a refrigerant and a heat recoverer, wherein the two ends of the heat recoverer are communicated with the condenser and the evaporator through a first-stage throttling / expansion valve and a second-stage throttling / expansion valve correspondingly, the heat recoverer and the evaporator are located in the same air duct, an indoor fan is arranged in the air duct, and the first-stage throttling / expansion valve and the second-stage throttling / expansion valve are both electronic expansion valves with the opening degree capable of being adjusted in the range of 0-100%. Meanwhile, the invention provides an accurate heat recovery method for the direct expansion type air conditioning system, wherein the accurate heat recovery method can accurately adjust the reheat recovery amount. When the direct expansion type air conditioning system operates under the refrigeration working condition, air passes through the evaporator to exchange heat with the evaporator under the action of the indoor fan firstly, the air is cooled and dehumidified, the cooled and dehumidified air passes through the heat recoverer to exchange heat with the heat recoverer, the temperature of the air is raised, and the air is conveyed into a room.

Description

technical field [0001] This patent relates to a heat recovery device and method for an air-conditioning system, specifically, a precise heat recovery device and method for a direct-expansion air-conditioning system. Background technique [0002] In the application of high-precision constant temperature and humidity air conditioning system, the condensed waste heat recovery of the refrigeration system is used as the heat source for reheating, and the output of the heat recovery is precisely controlled and adjusted, all through indirect recovery: first use the condensed waste heat to obtain heat recovery The relatively constant temperature hot water is used, and then the required hot water flow of the reheating (water) coil is precisely adjusted through the proportional three-way valve, thereby heating the temperature of the air. [0003] Direct expansion air conditioner condensation heat recovery and reheat technology. Competing manufacturers adopt the method of switching sol...

AI Technical Summary

Problems solved by technology

[0003] Direct expansion air conditioner condensing heat recovery and reheating technology, competitors use the method of switching solenoid valves to control the flow of refrigerant in the heat recovery device and condenser according to demand, there is The hysteresis of condensation reheat recovery control cannot achieve flexible heat recovery, and cannot accurately output the amount of condensation heat recovery; and it is easy to cause hidden dangers in the system (most of the refrigerant will be stored in the heat recovery device or condensate in one direction when the flow is switched. One of the devices), resulting in unstable operation of the refrigeration system

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