Heat recovery


Make waste heat work for you

Introduction In fresh-air/waste-air drying, cold air enters the kiln via the opened flaps and is then heated. This heated air is then forced through the wood stack and absorbs moisture from the wood. Some of this warm and damp air is released into the atmosphere through the opposite flaps.

However, this common form of construction also harbours the following disadvantages: The heating-up of cold air can lead to considerable performance peaks and in some circumstances in multi-kiln operation to heating breakdowns. This can result in a delay in all the drying processes or even in the discolouring of the load/batch. The warm expelled air is exhausted into the atmosphere without being used in any way.

And that is not the way it has to be

Heat recovery is the solution. Before the warm waste air leaves the kiln, it is passed through a heat exchanger and in this way it heats the cold incoming air. Thus the air which has already been heated once is used a second time.


This results in the following advantages for you: Your energy consumption drops by 10% and 20% depending on the season. The performance peaks are reduced by up to 30%. Your heating boiler is put to better and more even use. Your drying kilns become quieter. Heat recovery has a sound-proofing effect. If the performance of the boiler is under sized in meeting the demands of the dry kiln, you can still use this boiler since as a result of heat recovery, the overall heating demand made of the boiler is reduced.