Multi-stage heat exchange system

Abstract

The invention belongs to the technical field of heat exchange, and particularly provides a multi-stage heat exchange system. The multi-stage heat exchange system aims to solve the problems that an existing multi-stage heat exchange system is difficult to keep efficient operation in a low-temperature and high-humidity environment, and heat is wasted in the heat exchange process. Therefore, the multi-stage heat exchange system comprises a heat exchange unit, a heating unit and a refrigerating unit; the heating unit can exchange heat with a first heat exchange component of the heat exchange unit,and the refrigerating unit can exchange heat with a second heat exchange component of the heat exchange unit, so that heat generated in the heat exchange process of the heat exchange unit can be effectively utilized, and the heat exchange efficiency of the multi-stage heat exchange system is effectively improved; and in addition, a defrosting branch is further arranged in the refrigerating unit,parts of pipelines of the defrosting branch can exchange heat with a heater, and therefore the frosting problem of a refrigerating heat exchanger can be effectively solved through simple structural changes, the heat exchange efficiency is further improved, it is further effectively ensured that the multi-stage heat exchange system can effectively keep the efficient operation state in the low-temperature and high-humidity environment.

Description

technical field [0001] The invention belongs to the technical field of heat exchange, and specifically provides a multi-stage heat exchange system. Background technique [0002] Heat exchange systems are in great demand in many fields such as air conditioning, industrial refrigeration, and refrigeration and freezing. With the continuous expansion of application fields, users have higher and higher requirements for the adaptability of heat exchange systems, especially It is particularly concerned about the heat transfer capacity of the heat transfer system in a low temperature environment. Many existing heat exchange systems realize heat exchange directly through the refrigerant circulation circuit. Taking the refrigeration process as an example, the liquid (mixed with saturated steam) refrigerant evaporates in the coil of the evaporator to remove the heat from the air outside the coil. Refrigeration is realized by absorbing heat in the medium, that is, during the heat excha...

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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing multi-stage heat exchange system is difficult to achieve high-efficiency operation in a low-temperature and high-humidity environment, and it is easy to generate heat waste during the heat exchange process, the present invention provides a A multi-stage heat exchange system, the multi-stage heat exchange system includes a heat exchange unit, a heating unit and a refrigeration unit, the heat exchange unit includes a refrigerant circulation circuit and a first A heat exchange component, a throttling component, a second heat exchange component, and a compressor. The heating unit includes a heating pipeline, a third heat exchanging component and a heat dissipation component arranged on the heating pipeline, and the third heat exchanging The component is configured to absorb the heat released by the first heat exchange component, and the heat dissipation component is configured to release the heat absorbed by the third heat exchange component. The refrigerating unit includes a refrigeration cycle circuit and a defrosting branch circuit. A fourth heat exchange component, a refrigeration heat exchanger, and a refrigeration pump are sequentially arranged on the refrigeration cycle, the fourth heat exchange component is configured to absorb the cold released by the second heat exchange component, and the refrigeration heat exchange The device is set to be able to release the heat absorbed by the fourth heat exchange member, the defrosting branch is arranged in parallel with the refrigeration heat exchanger, a defrosting pump is arranged on the defrosting branch, and the defrosting branch A part of the pipeline can exchange heat with the heater to increase the temperature of the brine in the defrosting branch and thus achieve defrosting

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