Introduction of high and low temperature test chamber refrigeration system

The heating and cooling systems in high and low temperature test chambers are essential components that significantly influence the performance and reliability of the testing equipment. These systems have always been a major focus and challenge in the design and development of such chambers. There are various types of refrigeration methods, each with its own advantages and limitations. In this article, we will explore the main refrigeration systems used in today’s high and low temperature test chambers. Common refrigeration methods include mechanical refrigeration, liquid nitrogen refrigeration, and combinations of both. Mechanical refrigeration is a well-established technology, typically divided into single-stage and cascade systems. In China, the most commonly used mechanical refrigeration method involves the French "Taikang" fully enclosed air-cooled compressor system, which can be either single or multi-stage. This method offers a relatively slow cooling rate, usually between 1 to 10°C per minute, and rarely exceeds 15°C per minute. For applications requiring faster cooling, liquid nitrogen cooling or a design that separates the heating and cooling chambers may be necessary. Liquid nitrogen, on the other hand, provides excellent refrigeration performance. With a boiling point of -195.8°C at atmospheric pressure, it can achieve temperatures as low as -150°C and cool at a rate exceeding 60°C per minute. As an industrial byproduct, liquid nitrogen has become more cost-effective over time, making it increasingly popular in environmental testing equipment that demands rapid cooling and ultra-low temperatures. In summary, the choice of refrigeration system for a high and low temperature test chamber depends on specific testing requirements. Depending on the desired temperature range and cooling rate, engineers can select the most suitable refrigeration method. Understanding these options helps ensure optimal performance and efficiency in testing environments.

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