On-line monitoring and controlling system and method for defrosting of air conditioner

Abstract

The invention discloses an on-line monitoring and controlling system and method for defrosting of an air conditioner. The on-line monitoring and controlling system comprises an air conditioner copper pipe, a dust guard, a filtering net, a plurality of infrared sensors for measuring radiation force of the air conditioner copper pipes, at least one thermocouple for measuring temperature of the air conditioner copper pipes, and a central control chip, wherein the central control chip is used for obtaining data returned by the infrared sensors and the thermocouples, and working out the actual emissivity of the surfaces of the copper pipes according to the Stefan-Boltzmann law so as to judge whether defrosting is needed or not and control a defrosting component to operate. The frosting condition is monitored based on the Planck law according to the principle that the value of difference between the copper pipe material emissivity and the frost emissivity is large, and the value of difference of the radiation power is large at the same temperature; hardware is improved little, and cost is low. The direct judgment strategy is adopted, monitoring is conducted in real time, and whether frosting exists or not is judged directly and precisely, and a defrosting signal can be emitted or interrupted in time; defrosting does not lag, so that the air conditioner keeps operating with the optimal performance, and the defrosting situation is judged accurately.

Description

technical field [0001] The invention relates to the field of air conditioner control, in particular to an air conditioner defrosting online monitoring and control system and method. Background technique [0002] When the air conditioner is heating in winter, the copper tubes of the outdoor heat exchanger are prone to frost, which affects the operating efficiency of the whole machine and increases the energy consumption of the air conditioner. At present, scholars at home and abroad have done a lot of theoretical and experimental research on defrosting control strategies. The main methods are as follows: [0003] Air conditioner defrosting can be roughly divided into timing control method, time temperature method, optimal defrosting time control method, differential pressure control method and adaptive fuzzy control defrosting method. [0004] Timing control method is a method adopted in the early stage. Extreme conditions are often considered when setting defrosting time, w...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem in the prior art that defrosting control uses empirical values ​​as reference values ​​or obtains indirect parameters to judge whether defrosting affects the accuracy, the proposed An air-conditioning defrosting online monitoring and control system

Images