Multi-mode accurate defrosting start-stop management method and system of air source heat pump

An air source heat pump, multi-mode technology, applied in the heating system, heating method, space heating and ventilation, etc., can solve the problems of the reduction of the heat transfer coefficient of the evaporator, the reduction of the evaporation temperature, the reduction of the energy efficiency of the system, etc. Cream, improve product quality, low price effect

CN112460868AActive Publication Date: 2021-03-09ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-03-09

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Abstract

The invention provides a multi-mode accurate defrosting start-stop management method and system of an air source heat pump. The method comprises the steps that S1, a heat pump defrosting operation parameter threshold value and a defrosting start condition are set; S2, the initial operation state, the initial defrosting mark and the operation time of the heat pump are obtained; S3, the evaporator air inlet temperature and the evaporator air outlet temperature are obtained; and S4, whether the initial defrosting mark is yes or not is judged, if yes, whether the operation time of the heat pump, the evaporator air inlet temperature, the air outlet temperature and the evaporator air inlet and outlet temperature difference meet the standard defrosting start condition or not is judged, if yes, defrosting is started, if not, whether the operation time of the heat pump and the evaporator air inlet temperature meet the initial defrosting start condition or not is judged, and if yes, defrosting is started. According to the method, the defrosting opportunity is jointly judged based on the evaporator air inlet and outlet temperature difference or by being assisted by the refrigerant pipe temperature, the operation time, the initial defrosting mark and the like, defrosting can be conducted accurately, misjudgment is effectively avoided, installation and collection are easy, the price is low,and good practicability is achieved.
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Description

technical field

[0001] The invention belongs to the technical field of heat pump defrosting, and in particular relates to a start-stop management method for multi-mode precise defrosting of an air source heat pump. Background technique

[0002] Air source heat pump is a clean and energy-saving technology that can be used in a wide range of fields such as production / domestic hot water, building heating, and agricultural drying. In recent years, it has played a key role in coal-to-electric heating in northern China, and has made important contributions to the alleviation of winter smog and the advancement of energy conservation and emission reduction.

[0003] The heat produced by the air source heat pump is to absorb heat from the air through the evaporator. The surface temperature of the evaporator is often lower than the dew point of the air. When the surface temperature of the evaporator is lower than the freezing point of water at the same time, frost will form on the sur...

Examples

Embodiment 1

[0050] Such as figure 1 As shown, the air source heat pump defrosting start-stop management method is applied to the air source heat pump system, including the air source heat pump main body 1, the evaporator 3 and the heating terminal, the air source heat pump main body 1 is connected with the working medium pipeline 2 and 7 The evaporators 3 are connected, and the heating end can be provided with a fan coil unit or a cooling fin. The air inlet side of the evaporator is provided with an air inlet temperature sensor 5, and the air outlet side is provided with an air outlet temperature sensor. Both the air inlet temperature sensor 5 and the air outlet temperature sensor 5 are connected to a data processing device 8, and the data processing device 8 is connected to the heat pump main body. 1 connected.

[0051] Before starting the defrosting start-stop management, it is necessary to set the defrosting operation parameter threshold and the defrosting start condition of the heat ...

Embodiment 2

[0084] The air source heat pump multi-mode precise defrosting start-stop management method described in this embodiment is different from Embodiment 1 in that a pipe temperature sensor 9 is also installed at the inlet of the evaporator working medium pipeline, as Figure 7 As shown, the inlet and outlet air temperatures of the auxiliary evaporator jointly determine the timing of defrosting start and stop, so as to avoid the problem of misjudgment of defrosting caused by the inaccurate measurement of the air temperature sensor due to instantaneous wind force.

[0085] In step S1, the defrosting operation parameter threshold also includes the first threshold T of the inlet tube temperature of the evaporator d and the second threshold T of the inlet tube temperature of the evaporator e , the initial defrosting start conditions also include the evaporator inlet tube temperature T 7 When <the first threshold of the evaporator inlet pipe temperature; the second threshold<running ti...