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Research Article

Natural ventilation driven by a restricted heat source elevated to different levels

Changqing Yang1, Wenhao Luo1, Angui Li1( ), Xiaopan Gao1, Lunfei Che2, Lingmin Qiao3, Teng Gao1, Yubo Liu1
School of Building Services Science and Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China
China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan, Hubei 430063, China
Artificial Environment Control Technology Innovation Center of Xi'an University of Architecture and Technology-Yantai, Yantai, Shandong 264006, China
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Abstract

The thermal buoyancy generated by the difference in air density in a building can drive hot-pressed natural ventilation, which is an energy-efficient means of ventilation used to obtain higher air quality. Therefore, the effect of a single-point heat source with limited sides at different heights on stratified flow was studied in a naturally ventilated room in this paper. Based on the classical plume diffusion law of an independent point heat source and the mirroring principle, a calculation model of the thermal stratification height with a restricted source elevated to different levels was derived and validated. The quantitative effects of the heat source height from the floor, the effective opening area and other factors on the natural ventilation of hot pressure were analyzed. A threshold xT for the separation between a point source and a sidewall was defined to estimate whether the thermal plume was independent or restricted by a sidewall. And a method for calculating the threshold xT was obtained. This research can provide a reference basis for designing natural ventilation for buildings with a restricted heat source at different levels to achieve a desired indoor environment.

Keywords

natural ventilationthermal plumestratification heightrestricted heat sourcedifferent levels

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Building Simulation
Volume 15 Issue 2,
February 2022
Pages 281-289
DOI: 10.1007/s12273-021-0801-z
Cite this article:
Yang C, Luo W, Li A, et al. Natural ventilation driven by a restricted heat source elevated to different levels. Building Simulation, 2022, 15(2): 281-289. https://doi.org/10.1007/s12273-021-0801-z

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Received: 22 November 2020
Revised: 23 March 2021
Accepted: 02 April 2021
Published: 09 July 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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