Numerical simulation study on the effect of internal heat source on pumping ventilation

Abstract

Natural ventilation is a passive building technology that can reduce energy consumption for mechanical cooling of the indoor environment. Natural ventilation technology has received renewed attention from researchers. Theoretical studies on natural ventilation have evolved from a steady state to a non-steady state. Pumping ventilation is distinct from other ways of natural ventilation in that its flow direction alternatingly changes from the indoor to the outdoor. However, all published studies did not consider the influence of internal heat sources in pumping ventilation, and there are few discussions about the fluid periodic variation in wind-thermal coupling studies. Based on a previous study, the numerical simulation of single-sided pumping ventilation with two openings in the same wall driven by wind and thermal pressure is conducted in the paper. The influence of heat source intensity and the height of the location of the heat source are analyzed. The applicability of different ventilation rate calculation formulas is discussed. The results show that the indoor airflow oscillation frequency decreases in the effect of wind and thermal pressure, compared to driven by air pressure alone. However, changing the height location and intensity of the heat source does not affect the frequency characteristics in these cases.

HIGHLIGHTS

1. The effect of heat sources is considered in pumping ventilation for the first time.

2. The ventilation rates are less than the case driven by wind pressure alone.

3. The ventilation rates and room temperature increase with the heat source intensity.

4. The ventilation rates increase and then decrease with the height of the heat source.

Keywords:

• Numerical simulation
• natural ventilation
• pumping ventilation
• flow frequency
• ventilation rates

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

All data included in this study are available upon request by contact with the corresponding author.

Additional information

Funding

This study was supported by the Major R&D projects of China Metallurgical group corporation (2022 No.14) and Wuhan Key R&D Plan (2023020402010590).

Notes on contributors

Haitao Zhao

Haitao Zhao Male, born in February 2000, School of Civil Engineering, Wuhan University of Technology, Master degree candidate.

Junli Zhou

Junli Zhou Female, born in October 1977, School of Civil Engineering, Wuhan University of Technology, Associate Professor.

Xue Xiao

Xue Xiao Female, born in January 1998, School of Civil Engineering, Wuhan University of Technology, Master.

Wenjun Zhu

Wenjun Zhu Female, born in November 2000, School of Civil Engineering, Wuhan University of Technology, Master degree candidate.

Xinpeng Qiu

Xinpeng Qiu Male, born in May 1999, School of Civil Engineering, Wuhan University of Technology, Master degree candidate.

Jiaji Zhang

Jiaji Zhang Male, born in September 1993, School of Civil Engineering, Wuhan University of Technology, Doctoral candidate.

Wei Yang

Wei Yang Female, born in January 1984, Faculty of Architecture, Building and Planning, The University of Melbourne, Melbourne, VIC, Australia, Ph.D.