The return air temperature of the heat pipe is very important to the use, if there is any difference in the return air temperature, it will affect the operation of the equipment.
Next, the heat pipe manufacturer Yonghui will introduce the calculation method of the return air temperature of the heat pipe.
During the operation of the drying equipment, the heat pipe will not take away the moisture in the material because the high-temperature air reaches or is close to the saturated state during the cycle drying process, so it reaches the saturated state and stops evaporation.
Continued drying in this state has no effect and should be ruled out.
If the moisture content of the material is relatively high, it is easy to cause the outside hot air to be saturated in a short period of time, all use fresh air drying, that is, after the air is heated by the heat dissipation pipe, the hot air that has reached the temperature is sent into the dryer, and at the same time, it is sent from the other side.
Discharge, in the tunnel drying tunnel, the flow direction of the hot air is countercurrent to the flow of the material.
Another situation is hot air circulation drying. Because the moisture content of the material is not high, it is not easy to saturate the hot air in a short period of time, and the drying needs to maintain a certain evaporation temperature condition.
At this time, it is often used to remove part of the hot and humid air.
Supplement some fresh air, save energy consumption and reduce production costs.
The supplementary amount of fresh air generally ranges from 20-30%, depending on the process requirements.
Calculating the total heat transfer of heat pipes can be calculated as fresh air, that is, the inlet temperature of the air side is 108°C, and the outlet temperature is required to be 160°C, and then the total heat transfer can be calculated according to the flow rate, density and specific heat.
According to the determined steam temperature The logarithmic mean temperature difference can be found.