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Research Article

Heat transfer between occupied and unoccupied zone in large space building with floor-level side wall air-supply system

Xinqi Yang1, Haidong Wang1( ), Chunxiao Su1, Xin Wang1, Yi Wang2,3
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Advanced Study Program, National Center for Atmospheric Research, Boulder, CO, USA
Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
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Abstract

The air supply terminal located at the floor level attached to side-wall is widely used in large space buildings, leading to potential energy saving as well as significant vertical thermal stratification. The cooling load calculation of such system is challenging, especially the calculation of the load gained from unoccupied zone. This paper adopts experiment and computational fluid dynamics (CFD) methods to study the heat transfer upward and downward across the stratified surface in large space building with floor-level side wall air-supply system. Five experimental cases with different heat source power and exhaust airflow ratios are performed to study their effects on the indoor thermal environment. We investigate the same cases in CFD and verify the result of vertical temperature distribution and cooling load components. As a critical parameter in evaluating the thermal stratification environment of large space building, the inter-zonal heat transfer coefficient Cb is emphatically discussed. By comparing the Cb value obtained through the two methods, the accuracy of the microscopic method is verified by the heat balance method. The results show that the Cb value is mainly affected by the zonal division and air distribution, but less prominently by exhaust airflow ratio and heat source in the occupied zone.

Keywords

CFD simulationlarge space buildingthermal stratificationfloor level air supplyinter-zonal heat transfer coefficient

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Building Simulation
Volume 13 Issue 6,
December 2020
Pages 1221-1233
DOI: 10.1007/s12273-020-0639-9
Cite this article:
Yang X, Wang H, Su C, et al. Heat transfer between occupied and unoccupied zone in large space building with floor-level side wall air-supply system. Building Simulation, 2020, 13(6): 1221-1233. https://doi.org/10.1007/s12273-020-0639-9

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Received: 13 November 2019
Accepted: 26 March 2020
Published: 30 May 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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