Effective frost layer sensing device and defrosting control method thereof

Abstract

The invention provides an effective frost layer sensing device and a defrosting control method thereof and belongs to the field of heat pumps and air conditioners. The device comprises an outdoor fined heat exchanger with an arc slide way and a ball emitting circulating device. The ball emitting circulating device comprises a bottom sliding rail, an automatic ejector, a launcher, a launcher timer, a defrosting controller and a ball. The arc slide way, the bottom sliding rail, the automatic ejector and the launcher form a circulating channel. According to the device, the thickness of the frost layer on the fin surface can be sensed according to the influence on the resistance of the ball in the free downward sliding process due to the frost layer on the arc slide way surface of the outdoor fined heat exchanger, the thickness and distribution of the frost layer on the fin surface of the outdoor fined heat exchanger can be sensed effectively, defrosting misoperation is avoided through intelligent-controlled defrosting, reliability is high, energy consumption is reduced, cooling efficiency is improved, and the device has the advantages of easiness in mounting, low cost and capability of being produced in large scale.

Description

technical field [0001] The invention relates to the field of heat pumps and air conditioners, in particular to a frost layer effective sensing device and a defrosting control method thereof. Background technique [0002] The air-cooled heat pump unit is a kind of air-conditioning equipment. In winter in cold and high-humidity areas, when the air-cooled heat pump unit is running for heating, when the temperature of the outdoor heat exchanger coil is lower than the dew point temperature, condensed water will be generated on the surface of the condensed water. Once it is lower than 0 ℃, frost will form, and the frost layer will increase the air side resistance, change the geometric shape of the coil, and finally reduce the air volume of the unit, resulting in the deterioration of the heat transfer performance of the heat exchanger, the decrease of the evaporation temperature, and the increase of the operating pressure difference of the compressor. The operation of the unit is u...

AI Technical Summary

Problems solved by technology

However, when the ambient temperature is around 0 °C, the initial condensation on the fin surface or the ice water formed in rainy days will seriously interfere with the output voltage signal of the first electrode during the defrosting process of the system, resulting in misjudgment. There is no liquid film between the two electrodes as the basis to determine the defrosting stop, it is easy to appear that there is still a frost layer on the surface of some fins, and the defrosting operation is stopped early, especially the frost layer detection device is at the fin 2-3 mm It is also difficult to install in the gap

[0017] To sum up, the indirect method mainly judges the start and stop of defrosting based on the changes in the parameters of the heat pump system caused by frost. The heat pump system has many influencing parameters because of the interrelationship between various components. Even under the condition of no frost, the environment Or the fluctuation of system parameters may also have an impact similar to defrosting on the system, so the indirect method can hardly avoid the misoperation of defrosting

The direct method judges the start and stop of defrosting by directly measuring the thickness or detecting the frost layer distribution as a basis. This method is not affected by indoor and outdoor environmental parameters and system parameters, and has high accuracy; however, the current direct method or equipment The cost is relatively expensive, or the control components are difficult to install in dense fin slits, it is difficult to mass produce, and the social and economic benefits are low

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