Control method for electronic expansion valve of heat pump water heater
An electronic expansion valve, heat pump water heater technology, applied in fluid heaters, refrigerators, refrigeration components, etc., can solve the problems of adjustment shock, uneven water temperature change, shock generation, etc., to achieve a safe control method, save water tank space, Beneficial for heat exchange
Active Publication Date: 2014-08-20
AUX AIR CONDITIONING LTD BY SHARE LTD
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Problems solved by technology
However, due to the high system pressure of the heat pump water heater and the non-uniformity of the water temperature change, the calculation of the superheat of the return air will fluctuate, and the water heat exchange will cause the superheat to be very nonlinear in the dynamic response characteristics of the electronic expansion valve, and the superheat will oscillate. , hysteresis delay and other characteristics, resulting in PID control adjustment oscillation, easy to cause system instability, thereby affecting the performance of the system capacity, affecting the heating effect of the heat pump water heater, and the reliability of the system is difficult to guarantee under high pressure
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[0014] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
[0015] like figure 1 As shown, the heat pump water heater is mainly composed of a compressor 1, a water tank 2, an outdoor heat exchanger 3, an outdoor fan 4, an electronic expansion valve 5, and an indoor heat exchanger 7. The electronic expansion valve 5 is set between the water tank 2 and the outdoor heat exchanger. In the refrigerant circulation loop between the heaters 3, the indoor heat exchanger 7 is wound on the inner wall of the water tank 2, and the water tank 2 is also provided with an inlet water temperature sensor 63 for detecting the inlet water temperature T water, and the compressor 1 is also provided with a return The air temperature sensor 61 is used to detect the return air temperature T of the compressor. The outdoor heat exc...
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A control method for an electronic expansion valve of a heat pump water heater includes the steps: detecting an inlet water temperature T in a water tank, an outdoor environment temperature T, an outdoor coil temperature T and the back temperature T of a compressor in real time; determining the valve step value of the operation range of the electronic expansion valve according to the inlet water temperature T and the outdoor environment temperature T; adjusting the electronic expansion valve at set intervals; multiplying the current step number and adjustment factor to obtain the every-time acting valve step number of the electronic expansion valve and determining the adjustment factor according to back superheat degree SH which is obtained by deducting the outdoor coil temperature T from the back temperature T. The heat pump water heater using the control method has a more stable system and is safer in control.
Description
technical field [0001] The invention relates to an automatic control of a heat pump water heater, in particular to a control method for an electronic expansion valve of the heat pump water heater. Background technique [0002] The range of operating conditions of existing heat pump water heaters varies greatly throughout the year. How to effectively and safely control the electronic expansion valve, the PID adjustment (Proportional Integral Derivative control) method is used as a conventional control method, and the electronic expansion is determined according to the difference between the target superheat and the actual superheat. The valve moves valve steps each time. However, due to the high system pressure of the heat pump water heater and the non-uniformity of the water temperature change, the calculation of the superheat of the return air will fluctuate, and the water heat exchange will cause the superheat to be very nonlinear in the dynamic response characteristics of...
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IPC IPC(8): F25B49/02F24H9/20
Inventor 龚卫强陈红郑坚江
Owner AUX AIR CONDITIONING LTD BY SHARE LTD