Heat recovery system for carbon dioxide transcritical refrigeration system

Abstract

The invention provides a heat recovery system for a carbon dioxide transcritical refrigeration system. The heat recovery system comprises a high-temperature heat recovery subsystem and a medium-temperature heat recovery subsystem, wherein the high-temperature heat recovery subsystem comprises a high-temperature heat exchanger, a first liquid storage tank, a second liquid storage tank and a first heat exchanger, and the medium-temperature heat recovery subsystem comprises a medium-temperature heat exchanger, a third liquid storage tank and a second heat exchanger. By means of the heat recovery system, high-quality heat generated by the refrigerating system can be recovered, multiple times of heat exchange are sequentially conducted through the high-temperature heat exchanger and the medium-temperature heat exchanger, heat is fully utilized, the heat utilization rate of the refrigerating system is increased, energy waste is avoided, and the recovered heat can meet various requirements; the first heat exchanger and the second heat exchanger are used for heating usable water provided by a water supply system for multiple times, the high-temperature heat recovery subsystem and the medium-temperature heat recovery subsystem are comprehensively utilized, the more suitable usable water with the higher temperature can be provided, and the energy utilization rate is further increased.

Description

technical field [0001] The invention relates to the technical field of heat recovery systems, in particular to a heat recovery system for a carbon dioxide transcritical refrigeration system. Background technique [0002] The ice-making system of the National Speed ​​Skating Hall adopts a carbon dioxide transcritical ice-making system. From the perspective of the thermal properties of the working fluid, CO 2 (Carbon dioxide) has a high cooling capacity per unit volume, about 5 to 8 times that of traditional working fluids. Low kinematic viscosity at low temperature, strong heat transfer capacity. Furthermore CO 2 Good chemical stability, non-toxic and harmless, easy to obtain. The carbon dioxide refrigeration system will produce high-quality heat sources, and these high-quality heat sources need to be recycled and reused to save energy. [0003] Some of the current refrigeration systems (such as cold storage, remote refrigerators, etc.) also have heat recovery systems. Th...

AI Technical Summary

Problems solved by technology

[0003] Some of the current refrigeration systems (such as cold storage, remote refrigerators, etc.) also have heat recovery systems. These heat recovery systems mostly exist in fluorine refrigeration systems, ammonia refrigeration systems, etc., and these heat recovery systems are relatively simple and have a single use, such as Simple heat recovery for system defrosting, antifreeze, etc., and some simply improve the efficiency of the refrigeration system

As for the carbon dioxide system, especially the heat recovery system of the carbon dioxide transcritical refrigeration system used in large indoor ice rinks, due to its complex system and various uses, the traditional heat recovery system cannot efficiently utilize this high-quality heat source, and is not suitable for carbon dioxide refrigeration system

Images