A transcritical co with ejector 2 Combined heating and cooling system for multi-temperature supermarkets

Abstract

The invention discloses a transcritical CO with ejector 2 The cooling and heating combined supply system, principle and application of multi-temperature zone supermarkets relate to the field of refrigeration technology. It solves the problems that a large amount of cooling heat is not effectively utilized in the existing system, and at the same time, the throttling loss is large, and the comprehensive energy efficiency of the system is low. The technical solution is to add a group of hot water tanks with different temperatures connected to the outlet of the high-temperature compressor, a group of ejectors connected to the outlet of the gas cooler and the inlet of the evaporator, and a group of medium-temperature water tanks corresponding to the ejector group. Evaporator. The outlet of the injector group is connected to the inlet of the intercooler. The tap water in the hot water tank group absorbs the heat in the gas cooler and becomes hot water that can be used by supermarkets. In the ejector group, the high-temperature and high-pressure fluid at the outlet of the gas cooler is used to inject the outlet gas from the corresponding group of evaporators to increase the suction pressure of the compressor, reduce the power consumption of the compressor and increase the gas delivery of the compressor. quantity.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a transcritical CO with ejector 2 Combined cooling and heating system, principle and application of multi-temperature zone supermarket. Background technique [0002] The third-generation refrigerant is HFC (hydrofluorocarbon), represented by R134a, R410a, and R245fa. With its zero ODP value and excellent energy efficiency and environmental protection characteristics, it has been rapidly and widely used. However, with the global emphasis on greenhouse gases, HFCs are listed as one of the six sources of greenhouse gases by the Kyoto Protocol. Developed countries have advocated the elimination of the use of HFCs and the development of the next generation of low-GWP refrigerants. At present, the fourth-generation refrigerant advocates the use of NH 3 , CO 2 、H 2 Natural working fluids such as O, air and hydrocarbons are used as substitutes. of which CO 2 As the most pote...

AI Technical Summary

Problems solved by technology

However, in the actual process, due to the cumbersome and complicated control system, it is very easy to have the problem of poor cooling effect or even no cooling in a certain temperature zone during use.

The most important thing is that refrigeration with large temperature differences cannot be realized between different temperature zones, and the range of temperature differences is not large

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