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Multi-mode precise defrosting start-stop management method and system for 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 evaporator heat transfer coefficient decline, insufficient heating time, system energy efficiency decline, etc., to achieve stability Running status, improving defrosting accuracy, and improving the effect of accuracy

Active Publication Date: 2022-07-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Failure to defrost in time will lead to a decrease in the heat transfer coefficient of the evaporator, a decrease in evaporation temperature, a decrease in system energy efficiency, and a decrease in heating capacity; Heating capacity drops
Existing systems mostly use timing defrosting or defrosting according to the evaporation temperature, which may easily lead to untimely defrosting or excessive defrosting

Method used

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  • Multi-mode precise defrosting start-stop management method and system for air source heat pump
  • Multi-mode precise defrosting start-stop management method and system for air source heat pump
  • Multi-mode precise defrosting start-stop management method and system for air source heat pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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 tube temperature sensor 9 is also provided at the inlet of the evaporator working fluid pipeline, such as Figure 7 As shown in the figure, the inlet and outlet air temperatures of the auxiliary evaporator jointly determine the defrosting start and stop timing, so as to avoid the problem of inaccurate measurement of the air temperature sensor due to the instantaneous wind force, resulting in the problem of misjudgment of defrosting.

[0085] In step S1, the defrosting operation parameter threshold value further includes the first threshold value T of the inlet pipe temperature of the evaporator. d and evaporator inlet pipe temperature second threshold T e , the initial defrost start conditions also include the evaporator inlet pipe temperature T 7

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Abstract

The present invention provides a multi-mode precise defrosting start-stop management method and system for an air source heat pump. The method includes S1, setting a heat pump defrosting operation parameter threshold and defrosting start conditions; S2, acquiring the heat pump initialization operation state and initial defrosting mark and running time; S3, obtain the inlet air temperature of the evaporator and the outlet air temperature of the evaporator; S4, judge whether the initial defrosting is marked as yes or no, if so, judge the running time of the heat pump, the inlet air temperature of the evaporator, the outlet air temperature, the evaporation Whether the temperature difference between the inlet and outlet air of the evaporator meets the standard defrosting start conditions, if so, start defrosting; if not, judge whether the running time of the heat pump and the inlet air temperature of the evaporator meet the initial defrosting start conditions, if so, start defrosting. The method is based on the temperature difference between the inlet and outlet air of the evaporator or is supplemented by the temperature of the refrigerant tube, the running time, the initial defrost mark, etc. to jointly determine the defrosting timing. good usability.

Description

technical field [0001] The invention belongs to the technical field of heat pump defrosting, in particular to an air source heat pump multi-mode precise defrosting start-stop management method. 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 the conversion of coal to electricity for heating in northern China, and has made important contributions to the mitigation of winter haze and the promotion 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 temperature of the evaporator surface is often lower than the air dew point. When the evaporator surface temperature is lower than the freezing point of water at the same time, the evaporator surface will frost. Fai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B47/02F25B49/00F24D15/04
CPCF25B47/02F25B49/00F24D15/04F24D2200/12
Inventor 徐英杰郑垚波
Owner ZHEJIANG UNIV OF TECH
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