Overlapping type freezing-force circulation refrigeration unit (low pressure side)

Abstract

The invention relates to an overlapping type freezing-force circulation refrigeration unit. Cooling capacity is complemented through a mode that low-temperature liquid-state refrigerants are pressurized by a double-stage liquid circulation pump, after being heated by a cooler, the refrigerants enter a cold application unit which supplies cold capacity and become gaseous refrigerants, then pressure and temperature of the refrigerants are lowered after an expansion machine acts in an expansion mode, and then the refrigerants pass through the cooler or / and a throttle valve and return to a refrigerant storage tank. A circulating cooling water system in a traditional steam compressed type refrigeration unit is eliminated, and maintenance and operation cost is greatly reduced. Compared with a traditional set with the same cooling capacity, the energy conservation rate of the overlapping type freezing-force circulation refrigeration unit is improved more than 30%. Compared with a traditional refrigeration cycle technology, reinforced cold-transfer elements can be used more conveniently, refrigeration units are more compact, and refrigeration efficiency of the refrigeration units is higher.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a cascade cold cycle refrigeration device. Background technique [0002] Modern refrigeration technology, as a science, was developed in the middle and late nineteenth century. Before that, back to the ancestors of mankind, people knew the use of cold and simple artificial refrigeration very early: using the cellar as a cold storage room , has used spring water to cool storerooms for 5,000 years. [0003] After the twentieth century, refrigeration technology has made greater development: in 1910, the domestic refrigerator came out, and in 1917 it began to be put on the market as a commodity in the United States. In 1930, the emergence of freon refrigerants and the use of freon refrigerators brought new changes to refrigeration technology. In the 1970s, people conducted a lot of research on mixed working fluids, and began to use azeotropic mixed working fluids, which opene...

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Problems solved by technology

[0032] 2) The thermal efficiency of the Carnot cycle can only be less than 1, never equal to 1, because T 1 =∞ or T 2 =0 is impossible

[0035] 5) The limit point of the Carnot cycle is the atmospheric ambient temperature, and the Carnot cycle does not give a clear answer to the refrigeration process cycle below the ambient temperature

[0037] However, using the basic theory of thermodynamics cannot give a concise, clear and intuitive explanation of the refrigeration cycle.

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