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Ejection-pressurizing stair super-cooling trans-critical CO2 system and application

A transcritical, CO2 technology, applied in the fields of heat pumps and refrigeration, can solve problems such as large optimal subcooling and temperature mismatch in the evaporation process, and achieve the effects of eliminating the compression process, reducing energy consumption, and reducing design pressure

Pending Publication Date: 2020-05-12
TIANJIN UNIV OF COMMERCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However CO 2 The optimal subcooling degree of the system is relatively large. If single-stage evaporative cooling is used, the CO 2 Cooling process of supercritical fluid and CO 2 The temperature of the fluid evaporation process does not match, resulting in a large irreversible loss

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  • Ejection-pressurizing stair super-cooling trans-critical CO2 system and application
  • Ejection-pressurizing stair super-cooling trans-critical CO2 system and application

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Embodiment Construction

[0024] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are conventional biochemical reagents; the experimental methods, unless otherwise specified, are conventional methods.

[0025] The invention will be described in detail below in conjunction with the embodiments and accompanying drawings.

[0026] Such as figure 1 As shown, an ejector booster cascade subcooled transcritical CO 2 system, including high pressure ejector 3, CO 2 High-pressure injection CO composed of gas cooler 4, high-temperature stage throttle valve 5, and primary subcooler 6 2 First-stage subcooling; medium-pressure injection CO composed of medium-pressure injector 7, medium-temperature throttle valve 8, and secondary subcooler 9 2 Two-stage subcooling; high-pressure ejection of CO ...

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Abstract

The invention discloses an ejection-pressurizing stair super-cooling trans-critical CO2 system and application. The system comprises a CO2 evaporator and a CO2 compressor, wherein an outlet of the CO2evaporator successively communicates with the CO2 compressor, a main flow inlet of a high-pressure ejector and an inlet of a CO2 gas cooler; an outlet of the CO2 gas cooler is divided into two channels; one channel communicates with a refrigerant side of a first-grade sub-cooler, a main flow inlet of a middle-pressure ejector and an inlet of secondary flows of the high-pressure ejector; and the other channel communicates with a heating medium side of the first-grade sub-cooler and is then divided into two channels which respectively communicate with a refrigerator side of a secondary sub-cooler, a secondary flow inlet of the middle-pressure ejector and a heating medium side of the secondary sub-cooler as well as an inlet of the CO2 evaporator. The ejection-pressurizing stair super-coolingtrans-critical CO2 system disclosed by the invention has the beneficial effects that irreversible losses during heat exchange can be reduced; and an energy efficiency ratio of the whole system can beincreased.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and heat pumps, and in particular relates to a supercooled transcritical CO 2 systems and applications. Background technique [0002] With the development of society, energy and environmental issues are widely concerned by the society. For the field of refrigeration and air conditioning, according to the provisions of the "Kigali Amendment", currently widely used refrigerants such as R134a and R410A will be gradually reduced due to their high GWP. Therefore, it is very important to seek efficient and environmentally friendly alternative refrigerants. [0003] Among many refrigerants, CO 2 Non-toxic, non-flammable, ODP=0, GWP=1, with obvious environmental advantages, it can be used in automotive air conditioners, supermarket refrigeration, dairy factories, frozen seawater coolers, residential air conditioners and other fields. However, its critical temperature is low (31.1°C) and its crit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B9/00F25B9/08F25B41/06F25B40/02F25B1/00F25B41/30
CPCF25B9/008F25B9/08F25B40/02F25B1/00F25B41/30
Inventor 代宝民杨海宁郝云樱曹钰冯一宁钱家宝
Owner TIANJIN UNIV OF COMMERCE
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