Answer: From the perspective of energy utilization, we always hope that the dryer exhaust temperature is as high as possible, preferably the same as the inlet temperature, at which time the "waste cold" is zero. But in fact, this cannot be achieved. It is not uncommon for the inlet and outlet temperatures of the dryer to differ by more than .
It is sometimes abnormal that the exhaust temperature of the dryer is too high. The causes are:
① The compressed air inlet temperature is too high or the flow rate is too large;
② The operating conditions of the refrigeration system change, causing the refrigerant evaporation temperature to rise, so that the compressed air cannot be sufficiently cooled in the evaporator;
③ The heat dissipation of the outer wall of the precooler pipe is too large.
The reasons for the low exhaust temperature of the dryer are:
① The precooler heat conversion area is insufficient and the evaporator has excess cooling capacity;
② The compressed air inlet temperature is low or the flow rate is too small;
③ The operating conditions of the refrigeration system change, causing the refrigerant evaporation pressure to be lower than the normal value.
