Bidirectional auto-cascade heat pump system

A heat pump system, self-stacking technology, applied in heat pumps, lighting and heating equipment, damage protection, etc., can solve problems such as unfavorable long-term use of heat pumps, increased compressor exhaust temperature, and reduced heating efficiency.

Inactive Publication Date: 2018-05-22
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional heating method that consumes coal resources for heating has caused people's concerns because of its high pollution, low efficiency, and non-renewable problems. One of the feasible ways to solve these problems is to fully use air source heat pump technology to replace traditional technology for heating, although Air source heat pump technology has made rapid progress, but heat pump equipment is still dominated by low-temperature heat pumps, usually with an output temperature lower than 55°C
[0003] In the process of using heat pump technology to transform the coal-fired heating system, in order to match the indoor terminal equipment in the original heating system, hot water at a higher temperature must be output, but the commonly used vapor compression air source heat pump is applied to cold There will be the following defects in the area: heating capacity decay, heating efficiency reduction, compressor exhaust temperature ri

Method used

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  • Bidirectional auto-cascade heat pump system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1

[0017] See figure 1 The two-way self-cascade heat pump system includes a compressor 1, an indoor heat exchanger 2, a rectification column 3, a first regenerator 41, a second regenerator 42, and a secondary throttling device 43 connected by pipes between ports. , The main throttling device 5, the outdoor heat exchanger 6, the first four-way valve 7 and the second four-way valve 8; which work based on non-azeotropic mixture working fluid.

[0018] The D port of the first four-way valve 7 communicates with the outlet end of the compressor 1, the S port communicates with the outlet end of the main throttle device 5, the E port communicates with the inlet end of the outdoor heat exchanger 6, and the C port communicates with the indoor heat exchange The inlet end of the device 2 is connected.

[0019] The D port of the second four-way valve 8 communicates with the outlet end of the outdoor heat exchanger 6, the S port communicates with the outlet end of the indoor heat ...

Example Embodiment

[0026] Example 2

[0027] As an explanation of Embodiment 2 of the present invention, only the differences from Embodiment 1 described above will be described below.

[0028] See figure 2 , A start-up protection pipeline is connected in parallel at both ends of the compressor 1. The start-up protection pipeline includes a gas storage tank 13. One end of the gas storage tank 13 communicates with the inlet end of the compressor 1 through a stop valve 11, and the other end passes through a stop valve 12 communicates with the outlet end of the compressor 1. During operation, the two ports of the compressor 1 are bypassed by controlling the opening and closing states of the shut-off valves 11 and 12, so that the compressor 1 is started under a low-pressure load.

Example Embodiment

[0029] Example 3

[0030] As an explanation of Embodiment 3 of the present invention, only the differences from Embodiment 1 described above will be described below.

[0031] See image 3 , A separate storage pipeline is connected between the rectifying column 3 and the compressor 1, and the separate storage pipeline includes a liquid storage tank 92. One end of the liquid storage tank 92 passes through the shut-off valve 91 and the bottom drain port of the rectifying column 3 The other end communicates with the inlet end of the compressor 1 through a shut-off valve 93. By controlling the opening and closing states of the two shut-off valves, part of the working medium is stored when the working medium is excessive in the loop; and working medium is charged into the loop when the working medium is too small to ensure the operating efficiency of the loop. In addition, the bottom of the rectifying column mainly stores high-boiling components in the mixed working fluid, so that the ...

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PUM

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Abstract

The invention relates to a bidirectional auto-cascade heat pump system, and belongs to the technical field of heating. The bidirectional auto-cascade heat pump system comprises a compressor, an indoorheat exchanger, a rectification column, a first heat regenerator, a second heat regenerator, an auxiliary throttle device, a main throttle device, an outdoor heat exchanger, a first four-way valve and a second four-way valve. Through the combination of the ports of the double four-way valves in a communication state, the compressor, the indoor heat exchanger, the rectification column, the first heat regenerator, the second heat regenerator, the auxiliary throttle device, the main throttle device and the outdoor heat exchanger are combined into a heating loop and a defrosting loop which are anauto-cascade flow path separately, so that defrosting can be carried out when the running efficiency of the system is influenced due to frosting of the outdoor heat exchanger; moreover, heating witha high temperature difference of greater than 75 DEG C can be realized; and the bidirectional auto-cascade heat pump system can be widely applied to the technical field of heating.

Description

technical field [0001] The invention relates to the technical field of heating systems, in particular to a bidirectional self-cascading heat pump system. Background technique [0002] The traditional heating method that consumes coal resources for heating has caused people's concerns because of its high pollution, low efficiency, and non-renewable problems. One of the feasible ways to solve these problems is to fully use air source heat pump technology to replace traditional technology for heating, although Air source heat pump technology has made rapid progress, but heat pump equipment is still dominated by low-temperature heat pumps, usually with an output temperature lower than 55°C. [0003] In the process of using heat pump technology to transform the coal-fired heating system, in order to match the indoor terminal equipment in the original heating system, hot water at a higher temperature must be output, but the commonly used vapor compression air source heat pump is a...

Claims

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Application Information

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IPC IPC(8): F25B30/02F25B47/02F25B43/00
CPCF25B30/02F25B43/00F25B47/02F25B2600/25
Inventor 罗介霖王勤陈福胜刘轶伦陈光明杨定宇
Owner ZHEJIANG UNIV
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