Trans-critical-compression/absorption composite refrigeration device utilizing low-grade heat

A composite refrigeration and low-grade heat technology, which is applied to machines using waste heat, refrigerators, refrigeration and liquefaction, etc., can solve the problems that the refrigeration effect needs to be improved, the isentropic efficiency of the compressor is low, and the construction and maintenance costs are low. Improved utilization efficiency and simple device structure

Inactive Publication Date: 2012-08-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are some defects in the open compression/absorption compound refrigeration technology: (1) The inlet and outlet pressure of the compressor are closely related to the temperature of the heat source at the inlet and outlet of the connection position, and there are special requirements for the compressor. For example, in order to avoid polluting the solution, the compressor The requirement is an oil-free compressor; (2) The compression system and the absorption system use the same refrigerant. Due to the essential difference between absorption refrigeration and compression refr

Method used

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  • Trans-critical-compression/absorption composite refrigeration device utilizing low-grade heat
  • Trans-critical-compression/absorption composite refrigeration device utilizing low-grade heat

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Embodiment 1

[0037] Such as figure 1 As shown, the present invention is a transcritical / absorption refrigeration composite refrigeration device utilizing low-grade heat, wherein the working fluid of the transcritical circulation subsystem adopts carbon dioxide (the boiling point of R744 is -78.5°C under normal pressure), and the high-pressure absorption refrigeration subsystem The working fluid of the low-pressure stage absorption refrigeration subsystem is lithium bromide aqueous solution, in which water (the boiling point of R718 is 100°C under normal pressure) is the refrigerant. The whole device includes a high-pressure stage absorption refrigeration subsystem, a transcritical circulation subsystem and a low-pressure stage absorption refrigeration subsystem.

[0038] The steam outlet of the high-pressure generator 1 of the high-pressure stage absorption refrigeration subsystem is connected to the inlet of the condenser 2, the outlet of the condenser 2 is connected to the inlet of the f...

Embodiment 2

[0053] The transcritical circulation subsystem uses carbon dioxide as the working fluid, and the working fluid of the high-pressure stage absorption refrigeration subsystem and the low-pressure stage absorption refrigeration subsystem is ammonia solution, in which ammonia (R717 has a boiling point of -33.5°C under normal pressure) is the refrigerant. The structure of the refrigerating device, the connection mode of each component and the working process are the same as those in Embodiment 1.

[0054] In this embodiment, low-grade heat of about 80-100°C is used to obtain refrigeration at -20-5°C, and the utilization efficiency of electric energy is increased by about 30-65%, and the utilization efficiency of low-grade heat energy is increased by about 25-50%.

Embodiment 3

[0056] The transcritical circulation subsystem uses carbon dioxide as the working fluid; the working fluid of the high-pressure stage absorption refrigeration subsystem and the low-pressure stage absorption refrigeration subsystem is a mixture of tetrafluoroethane (R134a) and dimethylformamide (DMF), of which tetrafluoroethane Ethane (the boiling point of R134a under normal pressure is -26.26°C) is the refrigerant. The structure of the refrigerating device, the connection mode of each component and the working process are the same as those in Embodiment 1.

[0057] In this embodiment, low-grade heat of about 50-70°C is used to obtain refrigeration at -20-5°C, and the utilization efficiency of electric energy is increased by about 20-45%, and the utilization efficiency of low-grade heat energy is increased by about 35-60%.

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Abstract

The invention discloses a trans-critical-compression/absorption composite refrigeration device utilizing low-grade heat, which comprises a high-pressure stage absorption refrigeration subsystem, a trans-critical circulation subsystem and a low-pressure stage absorption refrigeration subsystem. Through reasonable energy coupling among the systems, the utilization efficiency of electric energy as well as the utilization efficiency of low-grade heat of an input system is improved, and the low-grade heat at a very low temperature can be fully utilized, so that the trans-critical-compression/absorption composite refrigeration device has better economic performance; and the whole device has a simple structure, thereby facilitating steady operation and requiring low construction and maintenance costs.

Description

technical field [0001] The invention relates to a transcritical / absorption composite refrigeration device, in particular to a transcritical / absorption refrigeration composite refrigeration device utilizing low-grade heat. Background technique [0002] In the industrial production sector, low-grade waste heat with a temperature lower than 200°C, or even 50-60°C, exists widely and in large quantities, such as gas turbines, metallurgical industry, cement industry, petrochemical industry, and food processing industry discharge a large amount of low-grade waste heat. For these waste heat, the traditional technology is difficult to use and the economy is extremely poor. Therefore, it is often discharged directly to the environment, which not only causes a great waste of energy, but also causes bad environmental thermal pollution. [0003] Utilizing low-grade heat for air-conditioning refrigeration is also a very potential application path, and absorption refrigeration technology i...

Claims

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Application Information

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IPC IPC(8): F25B25/02F25B27/02
CPCY02A30/274
Inventor 何一坚蒋云云朱祖文唐黎明松鹏
Owner ZHEJIANG UNIV
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