What is the working principle of the cold dryer?

    Under the condition of keeping the compressed air pressure basically unchanged, reducing the temperature of the compressed air can reduce the water vapor content in the compressed air, and the excess water vapor will condense into liquid. The partial pressure of water vapor in compressed air is determined by the temperature of compressed air. The cold dryer uses this principle and uses refrigeration technology to dry compressed air. Therefore, the cold dryer has refrigeration system.