Heat exchange system, control method of heat exchange system and air conditioner

Abstract

The invention provides a control method of a heat exchange system. The control method comprises the following steps of A, inputting a set temperature; B, calculating a refrigerating capacity K% according to the set temperature and an actually measured temperature; and C, setting the maximum opening degree limit value of an electronic expansion valve to be 100%, and adjusting the actual opening degree of the electronic expansion valve to be K%. According to the control method, adjustment of the refrigeration capacity can be more accurate and more timely, and cooperation between the electronic expansion valve and a compressor is realized so as to enable the refrigeration process to be more stable. The invention further provides the heat exchange system. The heat exchange system involves thecompressor, a condenser, a liquid storage device, the electronic expansion valve and an evaporator which are sequentially connected through pipelines; the heat exchange system further comprises an electronic controller, a first temperature sensor, a first pressure sensor and an early warning sensor arranged on an exhaust pipeline; and the compressor and the electronic expansion valve are controlled by the electronic controller. The invention further provides an air conditioner. The air conditioner comprises the heat exchange system.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a heat exchange system, a control method thereof, and an air conditioner. Background technique [0002] Temperature control is a very wide application requirement. The realization principle is through a heat exchange system, by actually measuring the temperature deviation of the controlled point, dynamically calculating and outputting the appropriate heating or cooling capacity (the cooling capacity can be regarded as a negative heating capacity ), so that it just offsets the ambient heat load of the controlled point, thereby eliminating the temperature deviation of the controlled point. There are many types of specific control algorithms, among which the most widely used is the PID algorithm, which can achieve precise and constant temperature control. [0003] However, the traditional refrigeration equipment represented by the thermal expansion valve does not have the ...

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Problems solved by technology

Obviously, this method will generate a lot of useless energy consumption, and the energy saving is very poor. On the other hand, the refrigeration equipment is always running at full load, and the fatigue is very high, which affects the life and reliability.

[0004] In recent years, the application of variable capacity compressors and electronic expansion valves has shown an obvious upward trend, but because many people mistakenly equate the displacement of the compressor with the cooling capacity, or even realize that the adjustment of cooling capacity is the key It lies in the expansion valve, but it lacks the correct control coordination of the variable capacity compressor, so it is always unable to stably adjust the output of the actual cooling capacity

In addition, even if the cooling capacity is successfully reduced, the hot gas bypass method is often used to balance the working conditions of the compressor, so that the overall energy consumption is not fully reduced, and the instability of the hot gas bypass itself greatly affects the cooling performance. volume regulation stability

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