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Conventional compression heat pump/two-stage absorption compound refrigerating system with internal heat recycling

A technology of internal circulation and composite refrigeration, which is applied in the direction of refrigerators, refrigeration and liquefaction, and machines using waste heat, etc. It can solve the problems of difficult oil return and lubrication of compressors, low energy conversion efficiency, and poor operating performance, so as to reduce heat. Pollution, energy conservation, and the effect of improving energy utilization efficiency

Inactive Publication Date: 2015-03-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some major defects that are difficult to overcome in the open compound method: the oil return and lubrication of the compressor are difficult, the pollution of the lubricating oil to the absorption subsystem, the absorption subsystem and the compression subsystem can only use the same refrigerant, etc., resulting in the actual system poor performance
However, due to the characteristics of the transcritical cycle itself, the energy conversion efficiency of the transcritical compression refrigeration (heat pump) subsystem is still relatively low compared with the conventional compression refrigeration (heat pump) system

Method used

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  • Conventional compression heat pump/two-stage absorption compound refrigerating system with internal heat recycling
  • Conventional compression heat pump/two-stage absorption compound refrigerating system with internal heat recycling
  • Conventional compression heat pump/two-stage absorption compound refrigerating system with internal heat recycling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] as attached figure 1 As shown, a conventional compression heat pump / two-stage absorption composite refrigeration system is used for heat internal circulation, in which,

[0033] The high-pressure end of the first compressor 1 is connected with the first internal heat exchanger 2, the subcooler 3, the high-pressure channel of the first regenerator 4, the fifth throttling device 5, the second internal heat exchanger 6, and the first regenerator The low-pressure channel of the device 4 is connected with the inlet of the compressor in sequence to form a conventional compression heat pump subsystem.

[0034] The first generator 7 is sequentially connected with the first condenser 8 , the first liquid reservoir 9 , and the first throttling device 10 , and then enters the first condensation subcooler 11 to be mixed with the steam from the second generator 17 . Through the adjustment of the first condensing subcooler 11, the gas-phase refrigerant enters the first absorber 12, ...

Embodiment 2

[0044] The conventional compression heat pump subsystem uses R134a, R410a, R1234yf, and R1234ze as refrigerants, and the two-stage absorption refrigeration subsystem uses lithium bromide water as the working fluid. The structure and connection mode of the composite refrigeration system are the same as those in Embodiment 1.

[0045] In this embodiment, a low-grade heat source of 58-65° C. can be used. Under the research condition, the COP calculated by the system based on the consumed mechanical energy mt It is 18-40% higher than the conventional compression refrigeration system under the same conditions. The system calculates the COP obtained by the cooling capacity obtained by the input low-grade heat net It is 18-50% higher than the two-stage absorption refrigeration system under the same conditions.

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Abstract

The invention discloses a conventional compression heat pump / two-stage absorption compound refrigerating system with internal heat recycling. A first generator, a first condenser, a first liquid accumulator, a first throttling valve, a first condensation subcooler, a first absorber, a first solution pump, a third liquid accumulator, a first solution heat exchanger, a third throttling valve, a second generator, a third internal heat exchanger, a second liquid accumulator, a second throttling valve, a first evaporation unit, a second absorber, a second solution pump, a second solution heat exchanger, a fourth throttling device, a fifth liquid accumulator, a first compressor, a first internal heat exchanger, a subcooler, a first heat regenerator, a fifth throttling device and a second internal heat exchanger are connected in a regular pattern. According to the conventional compression heat pump / two-stage absorption compound refrigerating system, energy drive in the modes of mechanical work and low-grade heat such as solar energy and waste heat is adopted, super-low-grade condensation heat emitted by a conventional compression heat pump subsystem is efficiently utilized, the electric energy and low-grade heat energy utilization rate is greatly improved, and system energy is efficiently utilized.

Description

technical field [0001] The invention belongs to the refrigeration field, and in particular relates to a conventional compression heat pump / two-stage absorption composite refrigeration system for heat internal circulation. Background technique [0002] In industry and other fields, there is a large amount of low-grade heat energy (solar energy, industrial waste heat, waste heat, geothermal heat, etc.). In the process of energy use and consumption, unused energy is discharged in the form of waste heat. In developed countries, the proportion of waste heat also reaches 43-60%. At present, the country with the highest energy utilization rate in the world is Japan, whose energy utilization rate is 57%, followed by the United States, whose energy utilization rate is 51%, while my country's energy source utilization rate is only about 30%. It can be seen that the gap with developed countries is still very large. big. It can be seen that improving energy utilization efficiency and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B25/02F25B27/02
CPCY02A30/274F25B25/02F25B27/02
Inventor 何一坚李荣吴杰蒋云云陈光明王祎
Owner ZHEJIANG UNIV