Analysis of the principle of modern high-low temperature test chamber refrigeration

The latest modern high and low temperature test chamber refrigeration principle analysis pulse width modulation (PWM), referred to as pulse width modulation, is a very effective technical pulse width modulation using the digital output of the microprocessor to control the analog circuit. The basic principle is briefly described as controlling the on-off of the switching device of the inverter circuit, so that the output end obtains a series of pulses of equal amplitude, and these pulses are used instead of the sine wave or the required waveform. That is, a plurality of pulses are generated in a half cycle of the output waveform so that the equivalent voltage of each pulse is a sinusoidal waveform, and in addition, the obtained output waveform is smoothed and the low harmonics are small. Refrigeration compressor start and stop control temperature + refrigeration compressor constant operation + heating PID control = traditional low temperature control mode. This traditional cooling method has many major drawbacks, which seriously affects the life of the compressor and wastes a lot of power. Therefore, the new PWM cold control technology came into being, achieving low-temperature energy-saving operation. It can keep the heater from participating in the work in the low temperature working state, control the refrigerant flow and flow direction of the refrigeration unit through PWM technology, and adjust the three-way flow of the refrigeration pipeline, the cold bypass pipeline and the hot bypass pipeline to achieve Automatic constant adjustment of the studio temperature. In this low-temperature test environment, this new cooling method can achieve about 40% of the total energy savings. The following briefly explains the PWM. The introduction of PWM technology in high and low temperature test chamber refrigeration systems is a very breakthrough performance and technological innovation. It can extend the life of the compressor while saving a lot of power. It also responds to the world's sustainable trends: saving energy! The technology is based on the custom-designed PWM control valve from Sporlan, USA. All of these require a PWM control valve to use this technology. The basic structure of the high and low temperature test chamber includes the refrigeration system, heating system, control system, humidity system, air circulation system and sensor system. This paper focuses on the principle of the refrigeration system of the high and low temperature test chamber in the future.

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