1、The refrigeration system is composed of Tecumseh totally closed compressor unit and high-efficiency plate heat exchanger.
2、The refrigerant is used as the refrigerant to make it circulate repeatedly through the stable and reliable low-temperature pump to cool the temperature in the test piece box.
3、PID control is adopted for heating.In the whole test, the cooling and heating rate are uniform, and the human computer interface is clean and intuitive.