Refrigerating circuit for air conditioning refrigeration device performance testing device

Abstract

The invention discloses a refrigerating circuit for an air conditioning refrigeration device performance testing device. The refrigerating circuit comprises an evaporator and three groups of compressing and condensing units arranged in parallel, wherein each group of compressing and condensing units comprises a compressor, a condenser, an expansion valve and a liquid dispenser which are connected in sequence. Refrigerant inlets of the compressors in the three groups of compressing and condensing units are respectively connected with a refrigerant outlet of the evaporator, and a refrigerant outlet of the liquid dispenser is respectively connected with a refrigerant inlet of the evaporator. Three groups of refrigeration system evaporation coils of the evaporator are connected in parallel in a mixed-arrangement mode, working medium exchange of refrigeration sub systems is achieved on the basis that the evaporator of an existing air handling unit only can achieve heat exchange of a working medium and air, accordingly difference of working medium thermo-dynamic property when refrigeration systems operate is eliminated, nonuniformity of air processing is reduced, and the uniformity performance of temperate and humidity of processed air can meet high requirement.

Description

technical field [0001] The invention relates to the technical field of air-conditioning and refrigeration equipment, in particular to a refrigeration circuit used for a performance test device of air-conditioning and refrigeration equipment. Background technique [0002] The evaporator is the core component of the air handling unit. The heat exchange capacity of the evaporator directly affects the temperature, humidity and uniformity of the air treated by the air handling unit. [0003] The evaporator of the existing air handling unit is composed of upper, middle and lower parts (see attached figure 2 ), each part is independently connected to a compression condensing unit. The disadvantage of this parallel connection is: when the air handling unit is running at low load, only part of the compression condensing unit is running, and the temperature and humidity of the treated air are not uniform at this time; when the air handling unit is running at low load, only the evapor...

AI Technical Summary

Problems solved by technology

The disadvantage of this parallel connection is: when the air handling unit is running at low load, only part of the compression condensing unit is running, and the temperature and humidity of the treated air are not uniform at this time; when the air handling unit is running at low load, only the evaporator can be used part of the evaporator, the utilization rate of the evaporator is very low; since the three systems operate independently, the uniformity of the treated air cannot be guaranteed, especially when the air entering the air handling unit is uneven, the three systems are difficult to coordinate effectively, and the treated air The inhomogeneity of the

[0005] The invention uses a set of refrigeration system to divide the evaporator into n evaporator modules only, and solves the problem of dry friction caused by unfavorable oil return of the compressor by changing the number of evaporator modules opened at different loads. When the air conditioner is working, the air passes through the The m (m≤n) evaporator modules that are turned on can meet the refrigeration requirements, but it cannot guarantee the uniformity of air temperature and humidity after treatment

Since the patent adopts a set of refrigeration system, the refrigerant is divided into m parts and enters m opened evaporator modules when it is running in the refrigeration system. The treatment effect is only determined by 1 to 2 evaporator modules on the air intake side, and the treatment effect of the rear evaporator modules is far less than that of the first 1 to 2 evaporator modules, so the cooling capacity of the patent is limited

Secondly, when the working condition is adjusted, the m evaporator modules that are turned on are adjusted at the same time, so the flexibility of the invention is not strong

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