Hot Air Recycling with Leister

Air Recycling with Leister

Large amounts of energy and thus money can be saved by recycling the hot air. Leister Technologies has customized solutions for combining air heaters and blowers, which are suitable for recycling hot air thanks to a design made to withstand high temperatures.

In order to heat a defined volume of air (air volume) to the desired temperature, a certain amount of energy needs to be present. The greater the difference in temperatures ΔT between the air inlet and the air outlet, the more energy that is needed. The ΔT is reduced by operating with hot-air recirculation, Saving Energy and Costs.

To ‘recycle’ the hot air from the process, both the needed blower and the air heater must withstand the high temperatures at the air inlet side. Leister’s LE 5000 DF-R and LE 10000 DF-R double-flange air heaters and RBR blower provide the solution. Air with a temperature of up to 350°C can be moved, reheated and recirculated without a problem.

When accessories such as insulated hoses, high-temperature seals and various flanges are added, systems with air heaters and blowers become perfectly supplemented for recycling applications.

Precise measurement
Determine thermodynamic properties with the highest accuracy.
Cut costs
Less energy consumption = less costs> money saved!
Reduce CO2 emissions
By saving energy, your company can reduce its CO2 emissions.
Hot Air Recycling - The Video
The Comparison

Sample calculation showing the potential of energy savings due to hot air recirculation.

Based on:

  • 24-hour operation
  • 250 days per year
  • T1=inlet= 20°C 
  • or T1= 160°C
  • or T1= 350°C
  • T2=target = 500°C

Example 4000 l/min

Annual energy consumption @

T1 = 20°C à 232’300 kWh
Required Power 38.7 kW

T1 = 160°C à 164’600 kWh
Required Power 27.4 kW

T1 = 350°C à 72’600 kWh
Required Power 12.1 kW

Saving per year T1 = 350°C vs. T1 = 20 °C
= 159.723 kWh
@ 0.12€/kWh
à savings = 19‘152.- € 


LE 5000 DF-R
LE 10000 DF-R
LE 10000 DF-R HT (up to 900°C)
Leister Blower RBR
Leister RBR Blower
Leister RBR Pop Corn
Popcorn System
Air heater LE 10000 DF-R
LE 10000 DF-R Air Heater
Heat Recirculation
Flexible. Sustainable. Leister.
We are local - worldwide
Leister Technologies AG
Galileo-Strasse 10
CH-6056 Kaegiswil / Switzerland

Phone +41 41 662 74 74
Fax +41 41 662 74 16
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