Heat Design, Controlling Analysis And Cooling Test Of Low-temperature Environment Simulator

Low-temperature Environment Simulator provides low temperature environment to test for certain devices or component. The simulator has a larger interior space and excellent insulation properties. In working condition, the simulator internal charge a certain amount of helium in order to enhance the internal heat transfer performance, and speed up the cooling rate. The most widely used low-temperature vacuum simulator, inside with a high vacuum environment, can provide protection of the vacuum insulation. For low-temperature Environment Simulator in this paper, the heat leak of the container component is one of the most critical issues. In the design process of such a cryogenic vessel, how to minimize heat flow through the simulator is a key point.In this paper, the door seal and the channel between inside and outside of the simulator are designed and optimized to reduce heat flow. The analysis of heat leakage is carried out in stable state at low temperatures, including the heat leak of the vacuum insulation of the container body, the heat leak of the wire channel, the support structure, the door seal structure and refrigerant coils.According to the function and purpose of the low-temperature environment simulator, its working progress is analyzed. Working progress is divided into several parts, including the target temperature of 85K, target temperature of 85K to 150K, the target temperature of 150K to room temperature, the target temperature of room temperature to 100℃and the rewarming process. Selection and Design of Programmable Logic Controller (PLC) is done under the control requirements.The internal heat sink cooling experiment is carried out to prove that the low temperature Environment Simulator'cooling rate is higher than the cooling rate of low-temperature vacuum vessel. The helium charged into the container can greatly increase the heat transfer performance within the space. Preliminary proved the rationality of the heat design of the low-temperature environment simulator.