One cooling coil too many
Dave Mucha, President
Steve Mucha Co.
I enjoyed the article on “Make-up air in the cleanroom” (CleanRooms, March 1999, page 28). I enjoy the technology and difficult engineering that can accompany such an article, and the author, Mr. Ray Schneider, did a very good job.
However, in the drawing of the make-up air unit, there appears to be two cooling coils, and for some reason, the filters increase the temperature of the outside air.
I submit that air travels through a pre-filter, charcoal filter, a bag filter, then through a preheat coil, whereupon the air temperature increases to 48 degrees F db. That would allow the HW on the piping to represent hot water.
The article was good reading, and there are huge savings in the works when we can apply what Mr. Schneider described for us.
Editor`s note: A corrected drawing of the make-up air unit appears below.