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A defrosting control method, 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 affecting the reliability of unit operation, compressor liquid hammer damage, incomplete refrigerant evaporation, etc.

Active Publication Date: 2021-03-19
NINGBO AUX ELECTRIC +1
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  • Summary
  • 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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  • A defrosting control method, device and air source heat pump
  • A defrosting control method, device and air source heat pump
  • A defrosting control method, 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. The defrosting control method can be applied to the air source heat pump 1 . like Figure 4 As shown, the above defrosting control method may include the following steps:

[0045] Step S101, when the air source heat pump operates in the heating mode, obtain 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 compressor heating cumulative operating time, the ambient temperature, the compressor continuous operating time, and the temperature of the defrosting coil. The ambient temperature and the temperature of the defrosting coil are collected by the collection unit 4 , and the accumulated running time of the compressor heating and the continuous runni...

no. 2 example

[0090] Please refer to Figure 5 , the embodiment of the present invention provides a defrosting control device 6 . The above-described defrosting control device 6 can be applied to the air source heat pump 1 . like 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 , the second acquisition module 14 and the exit module 15 .

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

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

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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, a 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 the four-way valve. Inexhaustible phenomenon. At the same time, when the unit is defrosting, according to the Carnot cycle principle, the water circuit condition is equivalent to the evaporation condition, and the low water temperature is equivalent to the low evaporation temperature. The large opening of the electronic expansion valve will cause the compressor to return to liquid, cause the compressor to be damaged by liquid shock, and affect the reliability of the unit operation. SUMMARY OF THE INVENTION [0003] In view of this, the present invention aims to provide a defrosting control meth...

Claims

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Application Information

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