The influence of atmospheric environment and unit condition on the frost on the surface of the wind side heat exchanger and the influence of frost on the performance of the unit are a multi-dimensional and non-linear relationship. The principle of fuzzy control is used to control the defrosting. The parameters for judging the frosting condition on the surface of the fin tube are divided into two categories: the influence of external conditions on frost formation and the influence of frost on the performance of the unit. The input quantity is blurred and the fuzzy quantity is measured. Comprehensively judge whether defrosting is needed, and in the process of defrosting, judge the response of the system to judge whether the previous defrosting signal is issued correctly, adjust the defrosting control rule based on this, and use the self-adjusting fuzzy control method. Achieving intelligent defrost control will improve the defrost control mode.
The use of frequency conversion technology. One problem encountered in the operation of a small central air conditioning system with a small air-cooled chiller and hot water unit as a cold and heat source is the variable operating condition adjustment problem. When only a part of the end devices are working indoors, the host needs to perform energy regulation. For systems with several compressors, the energy can be adjusted by opening and stopping, but the adjustment capability is also limited. For a single compressor system, there is a lack of energy regulation. The best way to solve the above problem is to use an inverter compressor, so that the cooling capacity or heating capacity of the unit can be adjusted according to the needs of the user. In addition to the wide range of energy regulation, the inverter compressor system has the characteristics of low voltage starting, energy saving and good defrosting performance. However, the use of inverter compressor should be combined with the application of electronic expansion valve, and the speed control fan is equipped with The corresponding control method can give full play to its advantages.
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