1. What are the reasons for the high exhaust temperature of the cold dryer?
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
2. What are the reasons for the low exhaust temperature of the cold dryer?
1. The heat exchange area of the precooler is insufficient and the evaporator has sufficient 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
3. What is the effect of the amount of refrigerant injection on the cold dryer?
1. If the refrigerant injection is too little, the cold dryer will have the following phenomena:
(1) The evaporation pressure and the refrigeration pressure are lower than the normal operation, but the air dew point cannot be lowered.
(2) The compressor shell gets hot.
2. Excessive refrigerant injection may cause dryness:
(1) As the refrigerant liquid accumulates in the refrigeration tank, the refrigeration tank area is reduced, resulting in increased refrigeration tank pressure, which may cause high-voltage tripping in severe cases.
(2) The load on the refrigeration compressor increases, making it difficult to start.
(3) The refrigerant is not fully vaporized in the evaporator, causing wet steam to enter the compressor, posing the risk of "liquid compression".
(4) As the refrigeration tank pressure increases, the compressor cooling capacity decreases and the air dew point rises.