Air source heat pump ultrasonic resonance defrosting method based on intermittent loading work
An air source heat pump, intermittent technology, applied in the direction of lighting and heating equipment, damage protection, refrigeration components, etc., can solve the problems of heat generation, power output efficiency drop, transducer and ultrasonic power supply damage, etc., to ensure safety and reduce Energy consumption, the effect of enhancing the effect
Active Publication Date: 2012-05-02
XI AN JIAOTONG UNIV
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Problems solved by technology
The transducer selection principle, installation method and working mechanism parameters of the two methods are not clear when used for defrosting, which makes it impossible to commercialize
At the same time, when the ultrasonic transducer works continuously under high power, it will heat up rapidly, which will easily cause damage to the transducer and ultrasonic power supply, and cause the resonant frequency of the transducer to drift greatly, and the power output efficiency will drop
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[0028] The present invention is described in detail below in conjunction with accompanying drawing.
[0029] Air source heat pump ultrasonic resonance defrosting method based on intermittent loading work, refer to figure 2 , install an ultrasonic transducer on the evaporator, adjust the ultrasonic transducer to be in a resonant working state, the resonant frequency is measured by an impedance analyzer or a frequency sweep excitation method, and the ultrasonic transducer is driven by an ultrasonic power supply in an intermittent loading manner. Ultrasonic defrosting.
[0030] The ultrasonic transducers include piezoelectric sheets, sandwich piezoelectric transducers and magnetostrictive ultrasonic transducers. The types of ultrasonic vibration include longitudinal vibration and radial vibration modes, and the range of longitudinal vibration frequencies is 15kHz-200kHz, the range of radial vibration frequency is 20kHz-4MHz.
[0031] The ultrasonic power supply has an automati...
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The invention discloses an air source heat pump ultrasonic resonance defrosting method based on an intermittent loading work. The method comprises the following steps of: arranging an ultrasonic transducer on an evaporator; regulating the ultrasonic transducer and making the ultrasonic transducer in harmonic working state; testing a harmonic frequency by using an impedance analyzer or using a sweeping frequency encourage mode; and driving the ultrasonic transducer to perform ultrasonic defrosting according to an intermittent loading mode by using an ultrasonic power supply. The air source heat pump ultrasonic resonance defrosting method has better effect when the method is applied to the frosting initial period of the air source heat pump; by using the continuous on-line work of intermittent ultrasonic vibration which has optimized period and working time, the air source heat pump ultrasonic resonance defrosting method has good defrosting effect and anti-frosting effect, the continuous long-time high-efficient heat exchanging rate of the evaporator is ensured, the problems that a conventional defrosting method has large energy consumption, temperature fluctuation, noise and the like are solved. The air source heat pump ultrasonic resonance defrosting method improves the reliability of an ultrasonic system and has obvious energy-saving effect.
Description
technical field [0001] The invention relates to the technical field of defrosting and frosting suppression of an air source heat pump evaporator, in particular to an air source heat pump ultrasonic resonance defrosting method based on intermittent loading. Background technique [0002] The evaporator is a key component of the refrigeration system based on the air source heat pump. Frosting on the surface of the evaporator on the air side of the heat pump system will block the fin gap (the air passage of the evaporator), reduce the air flow between the fins, and increase the evaporation. The thermal resistance of the evaporator reduces the heat transfer efficiency of the evaporator. [0003] At present, the evaporator mainly adopts the defrosting method of heating and defrosting, including four-way valve reverse hot gas defrosting and electric heating defrosting. When enough frost is deposited on the evaporator, the defrosting function is turned on. When the air conditioner ...
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IPC IPC(8): F25B47/00
Inventor徐光华王定远陶唐飞罗爱玲张四聪
OwnerXI AN JIAOTONG UNIV