Air to Air Heat Exchanger

Efficient heat recovery - cost-effective, designed-to-order

In many industrial processes hot exhaust air or gas is still today blown out to the environment without using its thermal energy. But in the context of higher energy costs and limits concerning CO2 emissions companies are required to make processes more efficient. First step is always to realize an internal waste heat recovery system - in this case meaning preheating fresh air by the exhaust air. The Kelvion AirToAir heat exchangers are the first choice for this purpose.


That's how it works: Warm air from the process flows around thinwalled plain tubes, cools down and condenses if necessary. Cold fresh air flows inside the tubes, is preheated by the exhaust air und then brought into the process - realizing an efficient heat recovery. Air to Air heat exchangers are designed as both simple crossflow and cross-counterflow with reversal hoods. As material stainless steel is used, thus the condensation of water is not crititcal. We have solutions for a wide range of air volume flows, as well as temperatures - we have experience up till 1000°C.

Kelvion Air To Air heat exchangers are available in two versions:

Air To Air Glued
The Air To Air Glued is a lightweight construction where the tube to tube-sheet connection is generated by a special silicon-free glue. This type of heat exchanger can be perfectly used in low to medium temperature applications up to a temperature of 180°C. The significant weight reduction of the Kelvion recuperator allows one to install it in previously inaccessible locations. The reduced need for welding and use of thin-walled components make the new construction cheaper and less complicated to manufacture, while also maintaining its full functionality.

Air To Air Welded
The Air To Air Welded is suited for applications with higher temperatures, higher pollution and higher external loads on the heat exchanger, fully customized to fulfill the individual customer needs. The tube to tube-sheet connection is generated via welding. 

In order to provide process and cost effective solution we may mix glued and welded solution as well as stainless steel and carbon steel materials. This way we control the temperature difference and condensation point to give you safe design with guaranteed performance with the lowest possible cost.

Please also see our related product the Rekuluvo.

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Kelvion AirToAir Heat Exchanger

Kelvion AirToAir Heat Exchanger

Kelvion AirToAir Heat Exchanger

Kelvion AirToAir Heat Exchanger

Kelvion AirToAir Heat Exchanger

Kelvion AirToAir Heat Exchanger

Kelvion AirToAir Heat Exchanger

Kelvion AirToAir Heat Exchanger


  • Designed for every customer needs
  • Silicon-free glue
  • Lightweight construction
  • Good cleanability
  • Short payback time

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