Defrosting control method and device and air source heat pump

An air source heat pump and control method technology, applied in the field of heat pumps, can solve problems such as incomplete defrosting, incomplete evaporation of refrigerant, and affecting unit operation reliability, so as to ensure reliable operation, optimize defrosting effect, and improve defrosting efficiency. The effect of frost reliability

Active Publication Date: 2019-03-08
NINGBO AUX ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most air source heat pumps discharge high-temperature and high-pressure gaseous refrigerant into the external unit coil heat exchanger for defrosting through the switching of four-way valves. When the unit enters defrosting under low ambient temperature and low water temperature conditions, defrosting is prone to occur. Inexhaustible phenomenon
At the same time, when the unit is defrosting, according to the principle of the Carnot cycle, the working condition of the waterway at this time is equivalent to the evaporation condition, and the low water temperature is equivalent to the low evaporation temperature. The lower evaporation condition will easily lead to incomplete evaporation of the refrigerant. The large opening of the electronic expansion valve will cause the compressor to return liquid, causing liquid shock damage to the compressor and affecting the operating reliability of the unit

Method used

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  • Defrosting control method and device and air source heat pump
  • Defrosting control method and device and air source heat pump
  • Defrosting control method and device and air source heat pump

Examples

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no. 1 example

[0044] Please refer to Figure 4 , the embodiment of the present invention provides a defrosting control method. This defrosting control method can be applied to the air source heat pump 1 . Such as Figure 4 As shown, the above-mentioned defrosting control method may include the following steps:

[0045] Step S101, when the air source heat pump is running in the heating mode, acquire the initial operating state parameters of the air source heat pump, and detect whether the initial operating state parameters meet the preset defrosting conditions.

[0046] In the embodiment of the present invention, the initial operating state parameters include the cumulative heating operation time of the compressor, the ambient temperature, the continuous operation time of the compressor, and the temperature of the defrosting coil. The ambient temperature and the defrosting coil temperature are collected by the collection unit 4 , and the cumulative running time of the compressor mechanism...

no. 2 example

[0090] Please refer to Figure 5 , the embodiment of the present invention provides a defrosting control device 6 . The defrosting control device 6 described above can be applied to the air source heat pump 1 . Such as Figure 5 As shown, the above-mentioned defrosting control device 6 may include: a parameter acquisition module 7, a first control module 8, a first acquisition module 9, a judgment module 10, a second control module 11, a first execution module 12, and a second execution module 13 , a second acquisition module 14 and an exit module 15 .

[0091] The parameter acquisition module 7 is used to acquire the initial operating state parameters of the air source heat pump when the air source heat pump is operating in the heating mode, and detect whether the initial operating state parameters meet the preset defrosting conditions.

[0092] In this embodiment of the present invention, the parameter acquisition module 7 can be used to execute step S101 in the first emb...

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Abstract

The invention provides a defrosting control method and device and an air source heat pump. The defrosting control method and device can be applied to the air source heat pump; an auxiliary heating device is arranged on a water channel of the air source heat pump; the defrosting control method comprises the following steps that after the air source heat pump enters a defrosting mode, a first operation state parameter of the air source heat pump is acquired in real time; whether the first operation state parameter meets an auxiliary heating starting condition or not is judged; the auxiliary heating device is started when the first operation state parameter meets the auxiliary heating opening condition, and the air source heat pump is controlled to enter an auxiliary defrosting mode; a secondoperation state parameter of the air source heat pump is acquired; and when the second operation state parameter meets a defrosting exiting condition, the air source heat pump is controlled to exit the defrosting mode. The auxiliary heating device is arranged on the water channel of the air source heat pump, auxiliary defrosting is carried out in a low-environment temperature and low-water temperature working condition, and thus defrosting reliability is improved.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a defrosting control method and device and an air source heat pump. Background technique [0002] At present, most air source heat pumps discharge high-temperature and high-pressure gaseous refrigerant into the external unit coil heat exchanger for defrosting through the switching of four-way valves. When the unit enters defrosting under low ambient temperature and low water temperature conditions, defrosting is prone to occur. inexhaustible phenomenon. At the same time, when the unit is defrosting, according to the principle of the Carnot cycle, the working condition of the waterway at this time is equivalent to the evaporation condition, and the low water temperature is equivalent to the low evaporation temperature. The lower evaporation condition will easily lead to incomplete evaporation of the refrigerant. The large opening of the electronic expansion valve will cause th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25D21/00F25D21/08
CPCF25D21/004F25D21/08
Inventor 李翱翔
Owner NINGBO AUX ELECTRIC
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