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RESEARCH PAPERS

A Zonal Model for Large Enclosures With Combined Stratification Cooling and Natural Ventilation: Part 1—Model Generation and its Procedure

[+] Author and Article Information
Jun Gao

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

Jia-ning Zhao

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

Xiao-dong Li

School of Municipal & Environmental Engineering, Harbin Institute of Technology, Box Number 2644, 150090, Harbin, Heilongjiang, Chinalxd8802@163.com.cn

Fu-sheng Gao

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

J. Sol. Energy Eng 128(3), 367-375 (Aug 03, 2005) (9 pages) doi:10.1115/1.2188958 History: Received July 18, 2004; Revised August 03, 2005

This paper describes a combined system of stratificated air conditioning and natural ventilation for large enclosures, which uses stratificated air conditioning to cool the occupied part of a space and uses natural ventilation to cool the upper part to reduce heat penetration into the lower air-conditioned part. A zonal model is constructed to predict the vertical temperature profiles of large enclosures under such a combined system. This model incorporates airflow and heat transfer throughout the space into the mass and heat balance equations for each horizontally settled zone. It introduces some particular flow dynamics and thermal effects into the predictions of mean airflows and temperature distributions. Different from those pressure-based zonal models applied generally to the predictions for small building rooms, it is termed a temperature-based zonal model, which uses correlations based on temperature differences in combination with submodels for modeling of mass flow and heat transfer in the large enclosures. The present paper provides a calculation procedure for the model. Model performances are then discussed through analyzing the impacts of some influential factors on the space air temperature profiles.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a large enclosure with the combined system and definition sketch of a zonal model applied to the predictions for it

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Figure 2

Upward spread of the opposite jets

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Figure 4

Buoyancy-driven natural ventilation

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Figure 5

Heat balance for interior surfaces

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Figure 6

Mass and heat balance for a space zone (a) mass balance (b) heat balance

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Figure 7

Flow chart of the procedure

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Figure 8

Schematic of the enclosure with the combined system of stratification cooling and natural ventilation used for calculation; enclosure size is 44×20×16m

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Figure 9

Impacts of the number of vertically divided zones on the results of the zonal model for an enclosure under the combined system (a) height above floor vs. temperature under different number of zones (b) ventilation flow rate vs. the number of zones

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Figure 10

Impacts of the value of cb on the results of the zonal model for an enclosure under the combined system (24 zones used) (a) height above floor vs. temperature under different value of cb (b) ventilation flow rate vs the value of cb

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Figure 11

Impacts of the value of cb on the calculated results of the zonal model without natural ventilation

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Figure 12

Impacts of relaxation factors on the results of natural ventilation flow rate and temperature in space zones (cb=2.3 and 8, the number of zone 32)

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Figure 3

Composition of airflow along vertical walls

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