Overlap refrigeration system using single working medium CO2 as refrigerant

Abstract

The invention discloses an overlap refrigeration system using a single working medium CO2 as a refrigerant. The overlap refrigeration system comprises a high-temperature compressor, a low-temperaturecompressor, a medium-temperature evaporator, a low-temperature evaporator, a condensation evaporator, an underground pipe condenser, a medium-temperature air-liquid separator, a low-temperature air-liquid separator, a liquid storer, an oil separator, an expansion valve, an electromagnetic valve, a flow adjusting valve, a drying filter, a one-way valve, a pressure transducer and a temperature sensor, which are connected through pipes; the flow adjusting valve is arranged between the underground pipe condenser and the medium-temperature electromagnetic valve; the pressure transducer and the expansion valve are arranged between the medium-temperature evaporator and the air-liquid separator in sequence; the pressure transducer and the one-way valve are arranged between the condensation evaporator and the medium-temperature air-liquid separator; the electromagnetic valve, the pressure transducer and the expansion valve are arranged between the liquid storer and an air sucking pipeline of the low-temperature compressor; and the one-way valve is arranged between the low-temperature air-liquid separator and the low-temperature compressor. The single working medium CO2 is adopted as the refrigerant of the overlap refrigeration system, so that the influence on the environment by the refrigerant emission is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection refrigeration, in particular to a system using a single working substance CO 2 Cascade refrigeration system as refrigerant. Background technique [0002] With the rapid development of my country's economy, the continuous improvement of people's living standards and the continuous expansion of the food processing industry, the market has higher and higher requirements for food quality, freshness, nutrition, flavor and other aspects. Cold storage is the most important special building to ensure food quality. Due to the large amount of fruit and vegetable production and demand in my country, the market demand for cold storage is increasing day by day. Due to the need to store different types of corrosive foods in commercial cold storage, storage at different temperatures is required to meet actual needs. [0003] Refrigeration device is the most important equipment in the construct...

AI Technical Summary

Problems solved by technology

However, due to the low critical temperature of CO2 (31.1°C), most of the CO2 system is a transcritical cycle in a warm tropical climate environment, and its critical pressure is high (7.38MPa), resulting in high operating pressure and large throttling loss of the system , the coefficient of performance of the system is lower than that of conventional fluorine systems, which limits the promotion of CO2 refrigeration systems

Images