Background for the project was the problems with condensation and contamination that has been experienced on the market with the very high efficient air handling units. Narrow plate spacings and plate designs holding the water causes big problems, especially when the units are run with low velocities. The water will not leave the exchanger, pressure drop increases dramatically and in worse case the units will not perform sufficient air exchange. Adding to this (in some cases) an increased contamination due to static electricity that you find in plastic exchangers.

Project was given to design an plate heat exchanger in metal with high efficiency but lowest possible pressure loss, and which would not hold condensation water. Plate heat exchanger was selected because of necessary air tightness in many applications, and metal was chosen not to have unnecessary contamination problems.
The Result was a counter flow plate heat exchanger with an “open” plate design not holding water, with in- and outlet guides to secure the air distribution over the plate, insulated cover plates to minimize material conductivity and optional plate spacings to allow optimal design possibilities. From now on to be known as Heatex Model L.