Dear himex,

The function of the pre cooler is probably drying the convey air.

The water content of the convey air is reduced by cooling.

The occurrence of condensation in the pneumatic conveying line depends on the gas conditions; pressure and temperature.

The engineers, who claim the possibility, should be able to substantiate their opinion with convincing calculations.

I think they have a point, considering high ambient temperatures combined with high RH of the ambient air.

Take care,

Teus ■

Greetings,

Teus is correct in everything he has told you as precooling blower intake air drys it and allows the blower to perfom more efficiently as the air stream is more dense due to the chilling of the air.

I am surprised the engineers you are dealing with did not discuss and describe the six laws of gasses in regard to your project and its application.

lzaharis ■

Greetings,

I presume that the cooler is mounted after the blower.

The water is there condensed easier, due to the higher pressure.

Have a nice day

Teus ■

Teus is correct in saying that the cooling / drying is done a lot easier with the cooler set up on the discharge. The wrinkle may be though that you will lose some of the air flow because the water that drops out used to be part of the air flow as humidity. There is a chance for reduced air flow.

That is different for an inlet side cooler set up. Though the cooler must be sized so much bigger since the pressure drop at inlet conditions should not amount to much. The resulting higher air density can also cause high conveying air flow and therefore speed. As far as I understand this is supposed to be a preventative type measure, correct? The moisture content will likely be indeed higher. ■