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A self-cascading low ambient temperature air source heat pump system

An air source heat pump, low temperature system technology, applied in lighting and heating equipment, irreversible cycle compressors, refrigerators, etc., can solve problems such as unavailability, reduce the number of parts, and improve energy efficiency.

Active Publication Date: 2020-07-03
陈宝山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, limited by the compressor, the limit ambient temperature of the single-stage compression refrigeration system is above -25°C, and the energy efficiency ratio (COP) under this working condition can only reach about 1.5, which is basically unusable in severe cold areas

Method used

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  • A self-cascading low ambient temperature air source heat pump system
  • A self-cascading low ambient temperature air source heat pump system
  • A self-cascading low ambient temperature air source heat pump system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, a self-cascading low ambient temperature air source heat pump system includes a refrigerant compression system, a heating device, a low temperature system, a high temperature system and an intermediate heat exchanger 11, a refrigerant compression system, a heating device, and a high temperature system It is connected with the intermediate heat exchanger 11 in turn to form a high-temperature refrigerant circulation system, and the low-temperature refrigerant in the low-temperature system undergoes heat exchange through the intermediate heat exchanger 11, and then conducts a second heat exchange with the air-cooled heat exchanger 15 , and the low-temperature refrigerant after secondary heat exchange is merged into the high-temperature refrigerant that has not passed through the intermediate heat exchanger 11 to perform a mixing cycle.

[0042] The beneficial effects of this embodiment are: the refrigerant compression system, the heating device, ...

Embodiment 2

[0044] Such as figure 1 As shown, a self-cascading low ambient temperature air source heat pump system includes a refrigerant compression system, a heating device, a low temperature system, a high temperature system and an intermediate heat exchanger 11, a refrigerant compression system, a heating device, and a high temperature system It is connected with the intermediate heat exchanger 11 in turn to form a high-temperature refrigerant circulation system, and the low-temperature refrigerant in the low-temperature system undergoes heat exchange through the intermediate heat exchanger 11, and then conducts a second heat exchange with the air-cooled heat exchanger 15 , and the low-temperature refrigerant after secondary heat exchange is merged into the high-temperature refrigerant that has not passed through the intermediate heat exchanger 11 to perform a mixing cycle.

[0045] It can be understood that the refrigerant compression system, the heating device, the high temperature ...

Embodiment 3

[0062] Such as figure 2 As shown, this embodiment adds an economizer on the basis of Embodiment 2. The economizer is arranged on the pipeline connecting the main expansion valve 9 and the two-way liquid reservoir 7. The economizer includes an economizer body 8 and an economizer expansion valve 19 , the high-temperature refrigerant separated by the first gas-liquid separator 5 is divided after passing through the two-way liquid receiver 7: a part of the high-temperature refrigerant enters the economizer body 8 for heat exchange, and then enters the main expansion valve 9 after heat exchange; the other part of the high-temperature refrigerant After entering the economizer expansion valve 19, it enters the economizer body 8 for heat exchange and then enters the compressor 1. An economizer solenoid valve 18 is installed at the inlet of the economizer expansion valve 19.

[0063] The working process of the present embodiment is: when closing the economizer electromagnetic valve 18...

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Abstract

The invention relates to a self-overlapping low-environment-temperature air source heat pump system. The system comprises a refrigerant compression system, a heat supply device, a low temperature system, a high temperature system and an intermediate heat exchanger; the refrigerant compression system, the heat supply device, the high temperature system and the intermediate heat exchanger are connected in sequence through pipelines to form a high-temperature refrigerant circulating system; a low-temperature refrigerant in the low-temperature system secondarily exchanges heat with an air coolingheat exchanger after primary heat exchange by the intermediate heat exchanger; and the low-temperature refrigerant after secondary heat exchange is gathered into a high-temperature refrigerant, not passing through the intermediate heat exchanger, for mixed circulation. The energy efficiency ratio of the air source heat pump system in low-temperature environment is improved; and the use limited environment temperature of the system is lower.

Description

technical field [0001] The invention relates to the field of cooling and heating, in particular to a self-cascading low ambient temperature air source heat pump system. Background technique [0002] At present, in view of the needs of environmental protection, the national coal-to-electricity work is in full swing, and the main equipment used to replace coal-fired boilers for heating is air source heat pumps. [0003] However, limited by the compressor, the limit ambient temperature of the single-stage compression refrigeration system is above -25°C, and the energy efficiency ratio (COP) under this working condition can only reach about 1.5, which is basically unusable in severe cold areas. [0004] In the usual single-stage air source heat pump system with an economizer, the national standard ambient temperature is -12°C, the water temperature is 41°C, the energy efficiency ratio is generally around 2.1, and the equipment use limit ambient temperature is -20~-25°C. At this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B1/00
CPCF25B1/00F25B2400/13
Inventor 陈宝山
Owner 陈宝山
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