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Absorption transcritical carbon dioxide two-stage compression refrigerating system

A two-stage compression and carbon dioxide technology, applied in refrigerators, refrigeration and liquefaction, lighting and heating equipment, etc., can solve the problems of large refrigerant flow loss, low refrigeration efficiency, large flow demand, etc., and achieve a large system refrigeration coefficient, Large cooling capacity and reduced heat transfer area

Pending Publication Date: 2019-06-11
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristic of this approach is: due to the cooled CO 2 Still a gas, the CO that enters the intercooler through the throttle valve 2 The flow demand is large, resulting in the CO entering the evaporator part 2 The refrigerant flow loss is large, the cooling capacity decreases, the cooling efficiency is low, and the operating cost is high

Method used

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  • Absorption transcritical carbon dioxide two-stage compression refrigerating system
  • Absorption transcritical carbon dioxide two-stage compression refrigerating system

Examples

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Embodiment 1

[0024] The schematic diagram of the absorption type transcritical carbon dioxide two-stage compression refrigeration system in this embodiment is as follows: figure 1As shown in the figure, it includes a two-stage compression refrigeration cycle and an absorption auxiliary refrigeration cycle. The refrigerant side channel of 13 , the cooling side channel of the dual-channel condenser 6 , the expander 5 , the evaporator 3 , and the refrigerant side channel of the absorber 10 are connected in sequence and then returned to the main refrigeration cycle of the low-pressure stage compressor 1 . The working medium of the two-stage compression refrigeration cycle is carbon dioxide. The absorption auxiliary refrigeration cycle includes a generator 7, a solution heat exchanger 9, a solution pump 11, a first throttling device 4-1, a second throttling device 4-2, and the solution side channel of the preheater 13 , the condensation side channel of the double-channel condenser 6 , the solu...

Embodiment 2

[0029] The schematic diagram of the absorption type transcritical carbon dioxide two-stage compression refrigeration system of the present invention is as follows: figure 2 As shown, it includes a two-stage compression refrigeration cycle and an absorption auxiliary refrigeration cycle. The two-stage compression refrigeration cycle is composed of a low-pressure stage compressor 1 , a refrigerant side channel of an intercooler 14 , a high-pressure stage compressor 2 , a refrigerant side channel of the preheater 13 , and a cooling side channel of the dual-channel condenser 6 . , the subcooling side channel of the subcooler 15 , the expander 5 , the evaporator 3 , and the refrigerant side channel of the absorber 10 are connected in sequence and then return to the main refrigeration cycle of the low pressure stage compressor 1 . The working medium of the two-stage compression refrigeration cycle is carbon dioxide. The absorption auxiliary refrigeration cycle includes a generator...

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Abstract

The invention discloses an absorption transcritical carbon dioxide two-stage compression refrigerating system, and aims to provide a refrigerating system which adopts CO2 cooling heat and CO2 expansion work to jointly drive an absorption refrigeration cycle to cool an interstage cooler so that the running cost and the initial investment cost of the system can be reduced. The absorption transcritical carbon dioxide two-stage compression refrigerating system comprises a two-stage compression refrigeration cycle and the absorption type auxiliary refrigeration cycle, a working medium of the two-stage compression refrigeration cycle is carbon dioxide, the two-stage compression refrigeration cycle comprises an expansion machine, and the expansion machine is arranged in a refrigerating medium inlet of an evaporator in the two-stage compression refrigeration cycle; and the auxiliary refrigerating cycle is used for reducing the suction temperature at an air suction port of a high-pressure stagecompressor in the two-stage compression refrigeration cycle. According to the system, the CO2 cooling heat and CO2 expansion work are utilized, the absorption type auxiliary refrigeration cycle is organically coupled to the steam compression main refrigeration cycle, the entropy production of the whole CO2 transcritical two-stage compression refrigerating system is smaller than that of an ordinary CO2 refrigerating system, and the thermodynamic process is more complete and is closer to a reverse carnot cycle.

Description

technical field [0001] The invention relates to the technical field of refrigeration, and more particularly to a transcritical carbon dioxide two-stage compression refrigeration system which adopts an absorption refrigeration cycle to cool down an intercooler. Background technique [0002] As people pay more and more attention to environmental problems and gradually deepen their understanding of the destructive effects of certain substances such as freons on the environment, it is a safe choice to re-use natural refrigerants. In the field of refrigeration technology, due to CO 2 It is considered to be the most potential long-term substitute for CFCs, HCFCs and HFCs. [0003] For further optimization of transcritical CO 2 Regarding the refrigeration performance of the circulating system, scholars have explored and studied the improvement of the structure of the circulating system, and proposed different types of new transcritical cycles. Due to the large pressure ratio of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B25/02
Inventor 杨永安李瑞申毕明月
Owner TIANJIN UNIV OF COMMERCE
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