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CFD simulation of pumping ventilation in a three-story isolated building with internal partitioning: Effects of partition widths, heights and locations

  • Research Article
  • Indoor/Outdoor Airflow and Air Quality
  • Published:
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Abstract

Pumping ventilation (PV), a special single-sided ventilation (SSV), has been certified as an effective strategy to improve the air exchange rate of SSV. However, most studies targeted on the single space, and few studies have been focused on the effect of internal partitioning on PV. This paper aims to evaluate the ventilation performance of PV influenced by different configurations of internal partitioning. Computational fluid dynamics (CFD) simulation was used to predict the flow fields and ventilation rates. The width (w/H), height (h/H) and location (d/H) are the three main internal partition parameters considered in this study. The simulation results showed that the total, mean and fluctuating ventilation rates all decrease with wider internal partitions. The normalized total ventilation rate decreases by 7.6% when w/H is increased from 50% to 75%. However, the reduction rate is only 0.23% between w/H = 0 and 25%, and only 0.61% between w/H = 25% and 50%. The ventilation rate is hardly reduced by increasing the partition width when w/H < 50%, whereas greatly reduced by wider partition for w/H > 50%. Increasing the partition height will reduce the mean ventilation rate but promote the fluctuating and total ventilation rate in some cases. An increase of total ventilation rate by 1.4% is observed from h/H = 50% to 75%. The ventilation rate is larger when the internal partition is attached to the leeward or windward wall. The total, mean and fluctuating ventilation rates for d/H = 50% are relatively higher than d/H = 0 by 1.5%, 3.1% and 0.8%, respectively. Hence the internal partition should be mounted attached to the windward wall so as to obtain the greatest pumping ventilation rate. The periodicity of pumping flow oscillation and pumping frequency are independent of the partition configurations. The peak power of pumping flow is the lowest for the widest internal partition and is negatively affected by the partition height, but it generally has a positive correlation with the distance between the partition and leeward wall. Present research will help to understand pumping ventilation mechanism in real buildings with internal partitioning and provide theoretical basis for developing unsteady natural ventilation technology in low-carbon buildings.

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Abbreviations

A :

window opening area (m2)

ACHPFR :

air change rate of the ventilated floor base on PFR (s−1)

A ref :

effective opening area (m2)

BR:

internal blockage ratio

C μ :

model constant (=0.09)

d :

distance between the partition and the leeward wall (m)

f :

pumping flow frequency (Hz)

F s :

safety factor

GCI:

grid convergence index

H :

building height (m)

h :

partition height (m)

I(z):

incident streamwise wind turbulent intensity (%)

k(z):

turbulent kinetic energy (m2/s2)

N :

number of the instantaneous ventilation rate recorded/measured in the time series

PFR:

purging flow rate (m3/s)

PSD:

power spectrum density

Q :

instantaneous ventilation rate (m3/s)

Q b :

total ventilation rate (m3/s)

Q ′b :

normalized total ventilation rate

\({\bar Q}\) :

mean ventilation rate (m3/s)

\({{\bar Q}^\prime}\) :

normalized mean ventilation rate

r :

grid refinement ratio

R :

speed ratio

s′ :

dimensionless window separation

S :

distance between the centerline of two windows (m)

St :

Strouhal number

u :

instantaneous wind speed (m/s)

U(z):

incident streamwise mean wind velocity (m/s)

U H :

velocity at the building height (m/s)

Uref:

= UH, reference wind speed (m/s)

U x :

mean stream-wise wind velocity (m/s)

V room :

internal volume of the ventilated floor (m3)

W :

width of the building (m)

w :

partition width (m)

y + :

dimensionless wall distance

z :

height to the ground (m)

γ :

mesh stretching ratio

ε(z):

turbulent dissipation rate (m2/s3)

σ Q :

fluctuating ventilation rate (m3/s)

σ(skQ/′}:

normalized fluctuating ventilation rate

ω(z):

specific dissipation rate (s−1)

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Acknowledgements

Authors would gratefully acknowledge the financial supports of the Natural Science Foundation of the Anhui Higher Education Institutions of China (2022AH050307) and the Opening Fund of State Key Laboratory of Green Building in Western China (LSKF202312), the National Key Research and Development Program of the Ministry of Science and Technology of China (No. 2022YFC3801601-02, Wuhan University), the Science Foundation (Meteorology) Innovation Development Joint Fund Key Project of Hubei Province (No.2023M15, Wuhan University), the Foreign Aid Project for High-Level Cooperation and Exchange Activities of the Ministry of Science and Technology (No. 202213, Wuhan University), the Natural Science Foundation of China (No. 51778504; No. U1867221, Wuhan University).

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Authors and Affiliations

  1. School of Energy and Environment, Anhui University of Technology, Ma-An-Shan, Anhui Province, 243002, China

    Huai-Yu Zhong, Jie Sun & Fu-Ping Qian

  2. State Key Laboratory of Green Building in Western China, Xi’an University of Architecture & Technology, Xi’an, Shaanxi Province, China

    Huai-Yu Zhong & Song-Heng Wu

  3. School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei Province, 430072, China

    Jin Shang & Fu-Yun Zhao

  4. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Chao Lin & Hideki Kikumoto

  5. School of Built and Natural Environment, University of Derby, Derby, UK

    Carlos Jimenez-Bescos

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  1. Huai-Yu Zhong
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  2. Jie Sun
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Correspondence to Huai-Yu Zhong.

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Zhong, HY., Sun, J., Lin, C. et al. CFD simulation of pumping ventilation in a three-story isolated building with internal partitioning: Effects of partition widths, heights and locations. Build. Simul. 17, 267–284 (2024). https://doi.org/10.1007/s12273-023-1068-3

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  • DOI: https://doi.org/10.1007/s12273-023-1068-3

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