Local Ventilation Unit with a Rotary Recuperative Heat Exchanger

The local ventilation unit Recuair DC40 with a rotary recuperative heat exchanger has an optimized air flow through the unit, in order to prevent generation of noise. It was developed on the basis of cooperation between CTU in Prague and RECUAIR Company, within a research project implemented under the Operational Program Enterprise and Innovation for Competitiveness. The ventilation unit was designed for installation directly into inhabited rooms, thus the noise is one of the mayor issues. Numerical CFD simulation of air flow, experimental measurement of noise characteristics in acoustic laboratory and measurement of efficiency in laboratory conditions were performed during the development of the new type of ventilation unit.

The recuperation unit with dimensions 455 × 425 × 105 mm is used for local ventilation of inhabited rooms. It is connected with the outdoor environment by the tube of 260 mm diameter, housing a recuperative heat exchanger for recovery of heat from the exhaust air. The unit operates with an air flow rate of 15 to 45 m³/h and it is equipped with air filters of class M5. The efficiency of heat recovery is up to 94 %, thanks to the unique design that prevents icing of the heat exchanger. The unit contains a rotary recuperative heat exchanger with a servo drive, which rotates 180°. This enables alternation of the exhaust air flow and fresh air flow through the heat exchanger channels. The exchanger rotates at defined intervals controlled according to the outdoor air temperature. The biggest potential for use is in cold areas where outside air temperature falls below freezing point. The device enables year-round operation with a high year-round efficiency of heat recovery.

Patent family:

• WO2021068996A1 HEAT RECOVERY VENTILATION UNIT

Articles:

• Zelenský, P., Zmrhal, V., Barták, M. et al. Simulation-aided development of a compact local ventilation unit with the use of CFD analysis. Build. Simul. 17, 2233–2247 (2024). https://doi.org/10.1007/s12273-024-1183-9

Results:

• https://www.recuair.com/

In collaboration with:

Contact:

doc. Ing. Vladimír Zmrhal, Ph.D.

Department of Environmental Engineering FME CTU in Prague

E-mail: vladimir.zmrhal@fs.cvut.cz

Phone: +420 224 353 239