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Research Article | Open Access

Impact of exterior convective heat transfer coefficient models on the energy demand prediction of buildings with different geometry

Samy Iousef1( ), Hamid Montazeri1,2, Bert Blocken1,2, Pieter van Wesemael1
Department of the Built Environment, Eindhoven University of Technology, P.O. Box 513, 5600, Eindhoven, The Netherlands
Department of Civil Engineering, KU Leuven, Kasteelpark Arenberg 40 - Bus 2447, 3001, Leuven, Belgium
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Abstract

Accurate models for exterior convective heat transfer coefficients (CHTC) are important for predicting building energy demand. A detailed review of the literature indicates that existing CHTC models take into account the impact of building geometry either incompletely, or not at all. To the best of our knowledge, research on the impact of exterior CHTC models on the predicted energy performance of buildings with different geometry has not yet been performed. This paper, therefore, investigates the influence of CHTC models on the calculated energy demand of buildings with varying geometry. Building energy simulations are performed for three groups: buildings with Hb (building height) > Wb (building width), buildings with Hb < Wb and buildings with Hb = Wb. Six commonly used CHTC models and a new generalized CHTC model are considered. The generalized CHTC model is expressed as a function of Hb and Wb. The simulations are performed for low and high thermal resistances of the building envelope. The results show that the different CHTC models provide significantly different predictions for the building energy demand. While for annual heating demand, deviations of -14.5% are found, for the annual cooling demand a maximum deviation of +42.0% is obtained, compared to the generalized CHTC model. This study underlines the need for the CHTC models to consider building geometry in their expressions, especially for high-rise buildings. For low-rise builgings, the observed deviations between the existing and the generalized CHTC model are less pronounced.

Keywords

computational fluid dynamics (CFD)building geometryconvective heat transfer coefficient (CHTC)energy demand predictionbuilding performance simulation (BPS)

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Building Simulation
Volume 12 Issue 5,
October 2019
Pages 797-816
DOI: 10.1007/s12273-019-0531-7
Cite this article:
Iousef S, Montazeri H, Blocken B, et al. Impact of exterior convective heat transfer coefficient models on the energy demand prediction of buildings with different geometry. Building Simulation, 2019, 12(5): 797-816. https://doi.org/10.1007/s12273-019-0531-7

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Received: 11 September 2018
Revised: 17 January 2019
Accepted: 20 February 2019
Published: 04 April 2019
© The Author(s) 2019.

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