Refrigerating system using carbon dioxide as secondary refrigerant

Abstract

The invention discloses a refrigerating system using carbon dioxide as a secondary refrigerant, and aims to provide a refrigerating system which can ensure the continuous operation of a carbon dioxide cyclic part and is safe in use. The refrigerant outlet of a low-temperature refrigerating unit is connected with the refrigerant inlet of a carbon dioxide condensation evaporator; the refrigerant inlet of the low-temperature refrigerating unit is connected with the refrigerant outlet of the carbon dioxide condensation evaporator; the carbon dioxide outlet of the carbon dioxide condensation evaporator is connected with the inlet of a carbon dioxide liquid storage device; the outlet of the carbon dioxide liquid storage device is connected with the carbon dioxide inlet of a carbon dioxide air cooler through a defrosting valve; the carbon dioxide outlet of the carbon dioxide air cooler is connected with the carbon dioxide inlet of the carbon dioxide condensation evaporator; the carbon dioxide liquid storage device is connected with a safety valve; potential difference for making the carbon dioxide continuously cycled exists between the carbon dioxide liquid storage device and the carbon dioxide air cooler; and the defrosting valve ensures that the system is continuously operated at a defrosting stage, and the safety valve ensures the stability of internal pressure when the system is shut down.

Description

technical field [0001] The invention relates to a compound refrigeration system, more specifically, relates to a refrigeration system using carbon dioxide as a refrigerant. Background technique [0002] In the traditional cold storage, the refrigerant or brine is usually directly input into the cold storage to absorb the heat load in the cold storage, thereby maintaining the low temperature environment of the cold storage. Due to the increasing attention to the safety of food storage, people hope that the medium in contact with food is safe and hygienic. However, most refrigerants or brines are harmful to food. How to use safe substitutes in cold storage has become a problem for people. focus of attention. [0003] As a natural medium, carbon dioxide is completely safe and hygienic for food except for its high pressure at room temperature. Therefore, it is completely feasible to use carbon dioxide as a cold medium in cold storage. Compared with the sensible heat refrigerat...

AI Technical Summary

Problems solved by technology

[0005] However, the existing refrigeration system with carbon dioxide as a refrigerant, in low temperature operation, CO 2 The surface of the air cooler will be frosted due to long-term operation

When the frost layer reaches a certain thickness, it is necessary to shut down and defrost, which cannot guarantee the continuous operation of the carbon dioxide cycle part, and no corresponding solution is proposed in the existing patents

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