I was contacted by an end user of EXAIR products in Thailand looking for a way to remove water within their process. The exact need was to blow off heat sink fins of a heat exchanger after leak testing. To leak test, they would pressurize the heat exchanger and submerge in water, checking for air leaks. After passing this test, the heat exchanger is transported to a conveyor line to be heated and dried.
The heat exchanger is rather large and heavy – 1200mm wide x 3000mm long x 500mm tall (approximately 47.25” wide x 118” long x 20” tall) and 300 kg (660 pounds) – and it slowly moves down a conveyor at 5m/min (16.5 ft/min). When travelling down the conveyor, a need was identified for an efficient blow off to remove the residual water from the heat exchanger fins.
To remedy this need, we (EXAIR and our Thai distributor, OilPure) recommended (3) 48” Super Air Knives, installed along the width of the heat exchanger. Two of these units are to be mounted on the top to blow the water through the fins of the heat exchanger, and a third is to be mounted on the bottom to remove any residual water left clinging to the fins. Here’s a schematic of the proposed setup. We ultimately recommended to blow the top Super Air Knives straight down for maximum force air to assist the water through the fins.
We added an Electronic Flow Controller to turn off the compressed air during down time between heat exchangers. By turning off the compressed air when no blow off is needed, we save compressed air and save cost in the process.
By understanding the need and specifics of the application, we were able to make a confident recommendation for this customer. If you have a problem in your application and think an EXAIR solution could help, contact an EXAIR Application Engineer. We’ll be happy to help sort out all the details.