Air source heat pump system and control method based on refrigerant supercooling heat recovery synergy

An air source heat pump and cold and heat recovery technology, applied in heat recovery systems, control input related to air characteristics, air conditioning systems, etc., can solve problems such as operation, small proportion of defrosting heat, and unclean defrosting

Active Publication Date: 2021-04-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the system uses five solenoid valves. When switching modes, five solenoid valves need to act simultaneously to complete the system structure and control. Second, the system is only suitable for frosting of outdoor heat exchangers. The energy saving in the actual application process is very limited; third, the defrosting process of the system only uses the sensible heat of t

Method used

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  • Air source heat pump system and control method based on refrigerant supercooling heat recovery synergy
  • Air source heat pump system and control method based on refrigerant supercooling heat recovery synergy
  • Air source heat pump system and control method based on refrigerant supercooling heat recovery synergy

Examples

Experimental program
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Effect test

Embodiment 1

[0062] This embodiment is based on the application of the air source heat pump with refrigerant subcooling heat recovery and efficiency enhancement to the air conditioning of the building environment, such as figure 2 shown, including:

[0063] Refrigerant circulation loop: mainly includes the refrigerant circulation of the air source heat pump mechanism. Among them, the connection relationship of each mechanism of the air source heat pump is: the first port, the second port, the third port, and the fourth port of the first four-way reversing valve 2 are respectively connected to the outlet of the compressor 1 and the port of the gas-liquid separator 13. The inlet, the first port of the indoor heat exchanger 14, and the second port of the second four-way reversing valve 5 are connected through refrigerant pipelines, and the first port, the second port, and the third port of the second four-way reversing valve 5 , the fourth interface and the second interface of the first thr...

Embodiment 2

[0090] In this embodiment, the air source heat pump based on refrigerant subcooling heat recovery efficiency is applied to the air conditioning of the building environment when the energy storage device adopts indirect energy storage, such as Figure 9 Show. The difference from Embodiment 1 is that the energy storage device is changed from a direct energy storage device consisting of only an energy storage container containing energy storage materials to a brine pump 19, an energy storage container 7 containing energy storage materials, a load The refrigerant-energy-storage material heat exchanger 20 and the indirect energy-storage device composed of the brine pipeline, and other structures and implementations are the same as those in Example 1.

[0091]In this embodiment, a brine circulation is added, and the refrigerant circulation circuit and the air circulation circuit are the same as those in Embodiment 1. The brine circulation circuit includes a subcooling heat exchange...

Embodiment 3

[0093] This embodiment is based on the application of air source heat pumps based on refrigerant subcooling heat recovery efficiency for hot water and chilled water heating, such as Figure 10 . The difference from Example 1 is that the indoor heat exchanger 14 and the indoor fan 15 are replaced by a refrigerant-water heat exchanger 19, and the rest of the structure and implementation are the same as in Example 1.

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Abstract

The invention relates to an air source heat pump system and control method based on refrigerant supercooling heat recovery synergy. The air source heat pump system comprises a gas-liquid separator, a compressor, a first four-way reversing valve, a first heat exchanger, a first throttling unit, a second four-way reversing valve, a first stop valve, a second throttling unit and a third heat exchanger which are connected in sequence. A heat storage device is connected to the two ends of the first stop valve in parallel, and any one or more of the first four-way reversing valve, the second four-way reversing valve, the first stop valve and the second stop valve are adjusted, the switching of the air source heat pump system among a cold storage refrigeration state, a common refrigeration state, a cold release refrigeration state, a frostless heat storage heating mode, a frostless common heating mode and a heat storage defrosting heating mode is achieved. Compared with the prior art, supercooling heat which is difficult to utilize by a common air source heat pump is transferred across time and space and fully utilized, and the overall capacity and energy efficiency of the unit are significantly improved.

Description

technical field [0001] The invention relates to the field of air source heat pumps, in particular to an air source heat pump system and a control method based on refrigerant subcooling heat recovery efficiency enhancement. Background technique [0002] The air source heat pump is a high-efficiency heat energy lifting and transferring device based on the reverse Carnot cycle. It uses a small amount of electric energy as power and uses refrigerant as a carrier to continuously absorb low-grade heat energy in the air and convert it into usable High grade thermal energy. Due to its high energy efficiency and stable heat supply, air source heat pumps are widely used in domestic hot water production, building environment air conditioning, drying and other fields. After being cooled and condensed by the condenser, the refrigerant of the air source heat pump is usually a liquid with high pressure saturation or small subcooling degree, and the temperature is relatively high, which ha...

Claims

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Application Information

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IPC IPC(8): F25B30/06F25B41/20F25B41/34F25B47/02F25B49/02F24F5/00F24F11/42F24F11/64F24F11/65F24F110/10
CPCY02B30/52
Inventor 邵亮亮李镇宇曹祥张春路
Owner TONGJI UNIV
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