Cascade refrigeration system

Abstract

A cascade refrigeration system comprises a high-temperature-class circulation loop, a low-temperature-class circulation loop and an evaporative condenser for connecting the high-temperature-class circulation loop with the low-temperature-class circulation loop, wherein the evaporative condenser comprises a low-temperature condenser located on one side and a high-temperature condenser located on the other side, the low-temperature condenser is connected in the low-temperature-class circulation loop, the high-temperature condenser is connected in the high-temperature-class circulation loop, and a pre-cooler is connected in the low-temperature-class circulation loop and is located in front of the evaporative condenser. The pre-cooler is arranged in a low-temperature-class circulation system and is located in front of the evaporative condenser, so that a low-temperature-class refrigerant can be cooled to be at certain temperature before flowing into the low-temperature condenser of the evaporative condenser, the temperature difference between a high-temperature evaporator and the low-temperature condenser is reduced, the reliability is improved, the service life is prolonged, the lower the temperature difference is, irreversible heat loss is lower, heat exchange efficiency can be also improved, and the performance of the unit can be improved.

Description

technical field [0001] The present invention relates to a cascade refrigeration system. Background technique [0002] In the prior art, refrigerating units are currently divided into two types: single system and cascade refrigerating system. When a lower temperature is required, the cascade refrigerating system is often used. Cascade refrigeration system is widely used in commercial food or pharmaceutical processing, transportation, storage and other fields, and plays an important role in food preservation and pharmaceutical quality preservation, such as shopping supermarkets, pharmaceutical companies, marine fishing, etc. A cascade refrigeration system usually includes a high-temperature stage circulation loop, a low-temperature stage circulation loop, and an evaporative condenser (except for three-system cascade) for connecting the high-temperature stage circulation loop to the low-temperature stage circulation loop. The condenser transfers heat from the low temperature s...

AI Technical Summary

Problems solved by technology

That is, the temperature difference between the two sides of the evaporative condenser is large, and it is easy to generate large stress, freeze and crack the heat exchanger, and the heat loss is also large, which reduces the heat transfer performance of the heat exchanger

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