A defrosting control method for an air source heat pump fan based on the operating characteristics of an outdoor fan

Abstract

The invention relates to a defrosting control method for an air source heat pump hot air fan based on operation characteristics of an outdoor fan, which belongs to the technical field of air source heat pump defrosting. The defrosting control method comprises the steps that firstly, a calculation model of a frosting amount is corrected by an average active power value P0 sampled and calculated inthe first T1 (3 min) of the operation time when the speed of the fan is stable after the fan is turned on for the first time, and then a real-time frosting amount Mi representing the frosting degree is calculated, and a frosting amount threshold Mdf is set according to a result measured by a defrosting experiment of a specific unit during delivery. The frosting degree of an outdoor coil is judgedaccording to the rotating speed of the outdoor fan and the real-time monitored active power, so that the timing when the air source heat pump hot air fan enters defrosting can be more accurately determined, and erroneous defrosting operation is avoided.

Description

technical field [0001] The invention belongs to the technical field of air source heat pump defrosting, and specifically relates to a defrosting control method for an air source heat pump fan by monitoring the speed and real-time active power of the outdoor fan. Background technique [0002] When the air source heat pump fan is in heating operation in winter, frost will form on the surface of the outdoor heat exchanger due to the influence of air temperature and humidity. With the growth and accumulation of the frost layer, the resistance of the air flowing through the heat exchanger increases, the flow rate decreases, and the heat transfer resistance increases, which causes the heating performance of the unit to decline, and in severe cases, the unit shuts down. Therefore, periodic defrosting operations are essential. The existing defrosting control methods can be divided into three categories according to the different judgment basis of defrosting: the first category is b...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an air source heat pump air blower defrosting control method based on the operating characteristics of the outdoor fan, which can reflect the frosting process of the unit with the change of the speed and power of the fan, effectively control the defrosting operation of the unit, and solve the problem of existing small The problem of "wrong defrosting" in the defrosting control of frequency conversion air source heat pump hot air blower ensures the efficient operation of the unit

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