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    Home > Active Ingredient News > Drugs Articles > Analysis of refrigeration principle of modern Zui new high temperature test chamber

    Analysis of refrigeration principle of modern Zui new high temperature test chamber

    • Last Update: 2014-06-11
    • Source: Internet
    • Author: User
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    The basic structure of the high and low temperature test chamber includes 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 Refrigeration compressor start stop control temperature + refrigeration compressor constant operation + heating PID control = traditional low temperature control mode This traditional way of refrigeration has many disadvantages, which seriously affect the life of compressor and waste a lot of electric energy Therefore, the new PWM cold control technology came into being to realize low-temperature energy-saving operation It can keep the heater out of operation in the low temperature working state, regulate the refrigerant flow and flow direction of the refrigeration unit by PWM technology, regulate the three-way flow of the refrigeration pipeline, the cold bypass pipeline and the heat bypass pipeline, so as to realize the automatic and constant adjustment of the temperature of the working room Under the condition of low temperature test environment, this new refrigeration method can save about 40% of the total energy consumption Here is a brief explanation of PWM Pulse width modulation (PWM), short for pulse width modulation, is a very effective technology for controlling analog circuit by using the digital output of microprocessor Its basic principle is to control the on-off of the switch device of the inverter circuit, so that a series of pulses with equal amplitude can be obtained at the output end, which can replace the sine wave or the required waveform In other words, multiple pulses are generated in the half period of the output waveform, making the equivalent voltage of each pulse sinusoidal In addition, the obtained output waveform is smooth and the low-order harmonic is less The introduction of PWM technology into the refrigeration system of high and low temperature test chamber is a breakthrough performance and technical innovation It can prolong the life of compressor and save a lot of electric energy This also responds to the world's sustainable development trend: energy conservation! This technology is based on the customized PWM control valve of American Sporlan company All of them need to get PWM control valve before using this technology.
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