Answer: In some special industries, not only is it necessary to use compressed air with a very low pressure dew point (i.e., water content), but the temperature of the compressed air must also be very low. The following methods can be used:
(1) Eliminate the precooler (air-to-air heat exchanger) so that the compressed air forced to be cooled by the evaporator cannot be heated up;
(2) Simultaneously calculate the refrigeration system and, if necessary, increase the power of the compressor, the heat exchange area of the evaporator and the condenser, etc. (A simple method commonly used in practice is to use a larger-sized dryer without a precooler to handle a smaller flow of gas).
