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Energies 2014, 7(11), 7348-7367; doi:10.3390/en7117348

Design Optimization of Heat Wheels for Energy Recovery in HVAC Systems

1
Department of Energy, Politecnico di Milano, Via Lambruschini 4, Milano 20156, Italy
2
Recuperator S.p.A., Via Valfurva 13, Rescaldina (MI) 20027, Italy
*
Author to whom correspondence should be addressed.
Received: 31 July 2014 / Revised: 13 September 2014 / Accepted: 4 November 2014 / Published: 14 November 2014
(This article belongs to the Special Issue Energy Efficient Building Design and Operation 2014)
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Abstract

Air to air heat exchangers play a crucial role in mechanical ventilation equipment, due to the potential primary energy savings both in case of refurbishment of existing buildings or in case of new ones. In particular, interest in heat wheels is increasing due to their low pressure drop and high effectiveness. In this paper a detailed optimization of design parameters of heat wheels is performed in order to maximize sensible effectiveness and to minimize pressure drop. The analysis is carried out through a one dimensional lumped parameters heat wheel model, which solves heat and mass transfer equations, and through appropriate correlations to estimate pressure drop. Simulation results have been compared with experimental data of a heat wheel tested in specific facilities, and good agreement is attained. The device optimization is performed through the variation of main design parameters, such as heat wheel length, channel base, height and thickness and for different operating conditions, namely the air face velocity and the revolution speed. It is shown that the best configurations are achieved with small channel thickness and, depending on the required sensible effectiveness, with appropriate values of wheel length and channel base and height. View Full-Text
Keywords: heat wheel optimization; heat wheel effectiveness; simulation; experimental data; heat exchanger design heat wheel optimization; heat wheel effectiveness; simulation; experimental data; heat exchanger design
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

De Antonellis, S.; Intini, M.; Joppolo, C.M.; Leone, C. Design Optimization of Heat Wheels for Energy Recovery in HVAC Systems. Energies 2014, 7, 7348-7367.

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