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Control method for controlling air source heat pump to be defrosted with suction temperature and water heater

A technology for controlling air and suction temperature, applied in fluid heaters, refrigerators, refrigeration components, etc., to solve problems such as untimely defrosting, low working efficiency of heat pump systems, and incorrect defrosting of heat pump systems, reducing misjudgment , suitable for promotion and use, the effect of the method is simple

Inactive Publication Date: 2017-05-31
QINGDAO HAIER NEW ENERGY ELECTRIC APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At the same time, the traditional defrosting method only considers the dry bulb temperature of the air, but when the dry bulb temperature of the air is low and the air humidity is low, the dew point temperature of the air is very low, and it is easy to judge only the dry bulb temperature of the ambient temperature. Wrong defrosting of the heat pump system, or untimely defrosting, resulting in low efficiency of the heat pump system

Method used

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  • Control method for controlling air source heat pump to be defrosted with suction temperature and water heater
  • Control method for controlling air source heat pump to be defrosted with suction temperature and water heater

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Embodiment 1

[0038] In this embodiment, after the heat pump system starts to run smoothly, the temperature at the suction end of the evaporator of the heat pump system is detected every certain time interval T. If the difference between the current detection value and the maximum value of the previous detection values ​​is greater than the set value , the heat pump system starts to execute the defrosting procedure.

[0039] Through the above method, the accurate calculation of the temperature change rate of the suction end of the evaporator is realized, and the purpose of reflecting the temperature change of the suction end of the evaporator in real time is achieved; at the same time, the judgment of whether the defrosting program is at the opening node is less accurate, Reduced chance of misjudgment.

[0040] In this embodiment, the temperature of the suction end of the evaporator is detected and judged after the heat pump system starts to work for a certain time T0 and the heat pump syst...

Embodiment 2

[0052] The difference between this embodiment and the first embodiment above is that after the heat pump system starts running smoothly, the temperature at the suction end of the evaporator of the heat pump system is detected in real time to obtain the real-time change rate of the detected temperature at the suction end of the compressor of the heat pump system; if If the real-time rate of change of the detected temperature at the suction end of the compressor of the heat pump system is greater than the set value, the heat pump system starts to execute the defrosting procedure.

[0053] By monitoring the temperature at the suction end of the evaporator of the heat pump system in real time, the change rate of the temperature monitoring value can be reflected in real time and accurately, making the judgment of the opening time node of the defrosting program even more inaccurate.

Embodiment 3

[0055] In this embodiment, when any of the following judgment conditions are met, the heat pump system exits the defrosting procedure; the judgment conditions include the following:

[0056] Judgment condition 1. After the heat pump system starts to execute the defrosting program, the temperature of the evaporator of the heat pump system is detected. When the detected temperature t21 of the evaporator is always higher than the set temperature t20 within a continuous period of time, the heat pump system exits the defrosting program. The length of the continuous time period is greater than T1. Preferably, T1 is 0.5 min.

[0057] Judgment condition 2: After the heat pump system starts to execute the defrosting program, the temperature of the evaporator of the heat pump system is detected every certain time interval T1. Exit the defrost program.

[0058] Judgment condition 3: When the heat pump system starts to execute the defrosting program for a certain time T2 (preferably, T2...

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Abstract

The invention relates to a control method for controlling an air source heat pump to be defrosted with a suction temperature. The temperature at the suction end of a heat pump system evaporator is detected and recorded; when the change rate of a detected value is larger than the preset value, a heat pump system begins to execute a defrosting program. By means of the control method, precise judgment on the real-time work condition of the heat pump system can be achieved just by detecting and judging the temperature at the suction end of the heat pump system, and thus the start time node of the defrosting program of the heat pump system is judged accurately. The invention furthermore relates to a heat pump water heater, and the heat pump water heater adopts the control method for controlling the air source heat pump to be defrosted with the suction temperature. Meanwhile, the heat pump water heater is simple in structure, the method is simple, the effect is obvious, and the water heater and the control method are suitable for being applied and popularized.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a heat pump water heater, and also to a control method for controlling defrosting of an air source heat pump by using suction temperature. Background technique [0002] At present, most system schemes of heat pump water heaters are designed with reference to the air conditioning system scheme. In the air conditioning system scheme, the functions of cooling in summer, warming in winter and frosting and defrosting of outdoor units in winter are realized through the reversing of the four-way valve. Indispensable important part of the system. In the heat pump system, the four-way valve is only used for defrosting during frost operation in winter, and its use is no longer so important or indispensable. In winter, when the four-way valve is used for reversing defrosting operation, the pressure fluctuations on both sides of the compressor are too large, which easily exceeds the normal oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02F25B49/02F24H9/20
Inventor 刘永智沙保国王保森
Owner QINGDAO HAIER NEW ENERGY ELECTRIC APPLIANCE
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