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Regenerative heat exchanger with flow friction ventilator

DOI: 10.1615/ICHMT.2015.THMT-15.1960
pages 863-866

A. Renz
Fluid System Dynamics and Aeroacoustics, Friedrich-Alexander-Universität Erlangen-Nurnberg, Cauerstraße 4, 91052 Erlangen, Germany

M. Becher
Fluid System Dynamics and Aeroacoustics, Friedrich-Alexander-Universität Erlangen-Nurnberg, Cauerstraße 4, 91052 Erlangen, Germany

Stefan Becker
Institute of Process Machinery and System Engineering (iPAT), Friedrich-Alexander University, D-91058 Erlangen, Deutschland

R. Pauer
formerly Institute of Fluid Mechanics, Technical University Dresden, Helmholtzstraße 10, 01069 Dresden, Germany


A newly developed device combines the three main elements of decentralized ventilation systems - two ventilators for the inlet and the outlet duct and one element for the heat recovery − into one single element. A friction ventilator consisting of circular plates which are rotating centrally in between the inlet and the outlet duct of ventilation systems can undertake the task of these three elements. The drag between the rotating discs and the fluid generates a countercurrent flow in the two ducts. Additionally the discs of the ventilator act as a heat exchanger. They show a much greater ability to transfer heat than usual heat exchangers due to the turbulent flow between their rotating surfaces and the fluid. The device has a very compact design and reduced acoustic emissions.

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