A defrosting control method and system for an air source heat pump

Abstract

The invention relates to a defrosting control method and system of an air source heat pump, belonging to the field of defrosting control of an air source heat pump. First, use the detection module of the air source heat pump to collect the ambient temperature, wet bulb temperature and fin temperature in real time to obtain the temperature detection result; then set the temperature threshold and judge the relationship between the temperature detection result and the temperature threshold to obtain the program Execution conditions; finally, according to the program execution conditions, execute the corresponding calculation program, calculate the temperature deviation result, and determine whether the air source heat pump enters the defrosting state according to the temperature deviation result. Continuously collect temperature data in real time through multiple temperature sensors, retrieve and execute corresponding calculation programs according to the temperature data, and determine whether the heat pump needs to enter the defrosting state at this time according to the relationship between the temperature deviation value and the preset temperature value, so that the heat pump Defrost at the exact time to ensure the heating capacity of the heat pump.

Description

technical field [0001] The invention relates to the field of defrosting of air source heat pumps, in particular to a defrosting control method and system of air source heat pumps. Background technique [0002] The air source heat pump is an energy-saving device that uses high-level energy to make heat flow from low-level heat source air to high-level heat source. As the name implies, an air source heat pump is a form of heat pump that can convert low-level thermal energy that cannot be directly used, such as the heat contained in air, soil, and water, into high-level thermal energy that can be used, thereby saving some high-level energy such as coal, gas, and oil. , electricity, etc. As an energy-saving heating technology product recognized by everyone, air source heat pumps have been widely promoted and applied. [0003] The air source heat pump absorbs low-grade heat in the forced-circulation air through the fin coil, and when the forced-circulation air passes through th...

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Problems solved by technology

[0004] However, in the actual use of existing air source heat pumps, it is often impossible to accurately identify whether the finned coil is frosted, and the problem of early defrosting or delayed defrosting caused by inaccurate judgment of the degree of frosting on the finned coil Once the air source heat pump enters the defrosting state and lags behind, the frosting of the finned coil will become more and more serious, resulting in a gradual decline in the heating capacity of the heat pump, and entering the defrosting state in advance will directly cause heat loss and cause a lot of heat waste.

[0005] Therefore, there is an urgent need for a method that can accurately control the air source heat pump to enter the defrosting state, so as to solve the problem of heat waste caused by the air source heat pump entering the defrosting state in advance, and the finned coil structure caused by the delay in entering the defrosting state. Increased frost and reduced heating capacity

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