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Research Papers

Displacement of Natural Ventilation in an Enclosure With a Convective/Radiative Heat Source and Nonadiabatic Envelopes

[+] Author and Article Information
Jun Gao1

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Box Number 2644, 150090, Harbin, Heilongjiang, Chinarace_gj@hit.edu.cn

Jia-ning Zhao

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Box Number 2644, 150090, Harbin, Heilongjiang, Chinazhaojianing@sina.com.cn

Fu-sheng Gao

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Box Number 2644, 150090, Harbin, Heilongjiang, Chinagfs@hit.edu.cn

1

Corresponding author.

J. Sol. Energy Eng 128(1), 83-89 (Apr 02, 2005) (7 pages) doi:10.1115/1.2148975 History: Received July 21, 2004; Revised April 02, 2005

This paper studies the real case of naturally ventilated space with a convective/radiative heat source and nonadiabatic envelopes. The real envelopes and heat source are introduced into a simple two-layer model of the displacement of natural ventilation, and then contribute to achieving a newly developed one: the “Thermal and airFlow Natural Ventilation” (TFNV) model. The TFNV model divides a whole space into two vertical zones of different temperatures and defines air temperature in the lower zone higher than in outdoor air. Comparisons of the predictions by the TFNV model and Computational Fluid Dynamics (CFD) simulation show good agreement. It is found that the TFNV model simplifies the multilevel stratifications in such a real case of naturally ventilated space into an ideal two-layer thermal stratification. Through a procedure for the TFNV model, fundamental guidelines for well-designed real naturally ventilated buildings are then discussed in this paper. Two notable points are presented, first, improving natural ventilation by increasing the effective area of openings and second, designing displacement of natural ventilation based on a desired interface height.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Displacement of natural ventilation in an enclosure with a convective/radiative heat source and nonadiabatic envelopes

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Figure 2

Flow chart of calculation procedure for the TFNV model

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Figure 3

Schematic of the displacement naturally ventilated space

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Figure 4

Velocity distribution on plane 1

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Figure 5

Temperature distribution on plane 2

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Figure 6

Comparison of the ventilation flow rate

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Figure 7

Comparison of vertical temperature distributions, two-point pattern of TFNV calculation, and multiple-point pattern on two selected lines of the CFD simulation

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Figure 8

Design the size of openings to achieve larger natural ventilation related parameters

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Figure 9

Process to design displacement of natural ventilation based on a certain interface height

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