Factors affecting the exhaust temperature of the Floor Model Manifold Freeze Dryers

Factors affecting the exhaust temperature of the Floor Model Manifold Freeze Dryers
People have the ability to perceive the cold and warm, know that they are cold and wear clothes, and they undress, but the Floor Model Manifold Freeze Dryers does not have this ability. The exhaust temperature of the refrigerating dryer is controlled by the operator of the refrigerating dryer. Can not control, it means that our refrigerated dryer has failed. Before we want to deal with the failure of a refrigerated dryer, we must understand what affects the exhaust temperature of the refrigerated dryer.
From the perspective of energy utilization, it is desirable that the higher the exhaust temperature of the dryer, the better, preferably the same as the intake air temperature, at which time the "waste cold" is zero. However, it is actually not the case that the temperature difference between the inlet and outlet of the dryer is 15 °C or more. This is because: 1 energy in the process of transmission and exchange, there will inevitably be loss; 2 the homogenizing gas whose temperature is not high and the temperature difference is not large, the heat transfer coefficient in the convective heat transfer of the partition wall (especially in the case of downstream heat transfer) is not Large; 3 The cooling of the saturated hot gas flow during the heat exchange process is inevitably accompanied by a phase change. Some of the total cooling capacity absorbed by it must be used to pay for the latent heat of phase change, so that the temperature drop of the hot gas flow is limited. This in turn limits the increase in the temperature of the cold gas stream.
Floor Model Manifold Freeze Dryers Reasons for high exhaust temperature: air compressor head overhaul dryer dryer temperature is too high, sometimes it is abnormal, it may be: 1 compressed air for excessive temperature or excessive flow; 2 refrigeration system The working condition changes. The evaporation temperature of the Ling medium is increased, so that the compressed air is not cooled enough in the evaporator; 3 the heat dissipation of the outer wall of the precooler pipe is too large.
Floor Model Manifold Freeze Dryers Reasons for low exhaust gas temperature: The exhaust gas temperature of the dryer is too low. Reasons: 1 The preheater has insufficient heat conversion area and the evaporator has more cooling capacity. 2 The compressed air inlet temperature is lower or the flow rate is too small. ; 3 The operating conditions of the refrigeration system change, so that the evaporation pressure of the refrigerant is lower than the normal value.

Only by understanding the factors affecting the exhaust temperature of the refrigerated dryer will it be more convenient for us to deal with the fault in time and reduce the loss.
The refrigerated dryer is one of the equipments often used in summer factories. In the pre-cooler, cold and hot compressed air are exchanged for heat and mass, and the total heat exchanged is equal. However, the saturated hot gas flow undergoes a phase change during the cooling process. The process of condensed water consumes a portion of the cold. The heat absorbed by the cold gas in the heat exchange process is all used for heating, so the temperature variation of the cold and hot gas flows is different. The regularity is that the temperature of the hot gas flow is smaller than that of the cold gas. For example, under certain conditions, the hot air is reduced from 40 ° C to 28 ° C, the drop is 12 ° C, and the cold air can be raised from 5 ° C to 24 ° C, the increase can reach 19 ° C.