Method for reducing dosage of R290 refrigerants of split-type air-cooling unit for freezing and refrigerating

Abstract

The invention discloses a method for reducing the dosage of R290 refrigerants of a split-type air-cooling unit for freezing and refrigerating. The split-type air-cooling unit comprises a compressor, an evaporative condenser, an electronic expansion valve, an air-cooling fan and a four-way reversing valve; under the refrigerating working condition, the four-way reversing valve is in the refrigerating working state, the refrigerants are compressed by the compressor and then enter the evaporative condenser to be condensed into liquid, the refrigerant liquid enters the air cooling fan for refrigeration after the electronic expansion valve conducts throttling and depressurizing, and after air is cooled and the refrigerants absorb heat, the refrigerants are gasified into gas and enter the compressor for compression circulation again; the four-way reversing valve is in the defrosting working state, the refrigerants are compressed by the compressor and then enter the air cooling fan to be condensed into liquid through heat emission, and the refrigerant liquid enters the evaporative condenser to absorb ambient heat after the electronic expansion valve conducts throttling and depressurizing,then is gasified into gas and enters the compressor for compression circulation again. The technical method is simple, easy to implement, ingenious in concept and low in cost, and has positive popularization and application value.

Description

technical field [0001] The invention relates to the field of refrigeration air-conditioning heat pumps of a split-type air cooler for freezing and refrigeration, and in particular to a method for reducing the amount of R290 refrigerant used in a split-type air cooler for freezing and refrigeration. Background technique [0002] Refrigeration systems for freezing and refrigeration often use ammonia as a refrigerant, which is a highly toxic and slightly flammable refrigerant. In recent years, there have been frequent accidents of liquid ammonia leakage in ammonia-related refrigeration enterprises, and the lessons have been very profound. [0003] my country is a signatory to the "Montreal Protocol" and "United Nations Framework Convention on Climate Change". According to the provisions of the treaty, HCFCS among the commonly used halogenated hydrocarbons and their mixture refrigerants has entered the stage of total reduction. are transitional in nature. According to the "Law ...

AI Technical Summary

Problems solved by technology

[0004] At present, centralized refrigeration systems are commonly used in large and medium-sized freezers and refrigerators. There are large liquid receivers and too long connecting pipelines, which lead to excessive refrigerant filling, increased possibility of leakage, and serious damage after leakage.

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