Fluctuation Behaviors of Air Pressure in a High-Rise Building Drainage System

With the rapid development of China's economy and the increasing levels of science, our country's high-rise building height and number of layers is also increasing. Especially in the 21st century, our country develop toward the height of high-rise buildings ever higher, more layers, better equipped, more complete, more advanced technology more economically rational. High-rise building has become a symbol of a modern metropolis. However, due to the high-rise buildings have many people, so relevant norms on its construction and drainage system design and fire safety, reliability and economic practicality of a higher requirement, this requires a high-rise building water supply and drainage system on the technical design more reasonable, economic budget cost savings at the same time to achieve its design function.

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Water-saving Concept and Technical Measures in High Rise Building Water Supply and Drainage System

Proceedings of the AASRI International Conference on Industrial Electronics and Applications (2015) ◽

10.2991/iea-15.2015.142 ◽

2015 ◽

Author(s):

Wang Xuefeng ◽

Hao Guizhen

Keyword(s):

Water Supply ◽

Drainage System ◽

Water Saving ◽

High Rise ◽

High Rise Building ◽

Technical Measures

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Ultra-High-Rise-Building Water Supply and Drainage System Design

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.2374 ◽

2014 ◽

Vol 580-583 ◽

pp. 2374-2379

Author(s):

Ya Nan Si ◽

Ming Zhou ◽

Yu Hang Liu ◽

Ling Deng

Keyword(s):

Water Supply ◽

System Design ◽

Rapid Development ◽

Drainage System ◽

Supply System ◽

Chinese Economy ◽

Fire Fighting ◽

High Rise ◽

High Rise Building ◽

Speed Up

With the rapid development of chinese economy,to speed up the modernation of the society more and more ultra-high-rise-building rise abruptly.This article as Liuhe square project in Shengzhen city an example,elaborated the water supply system, drainage system,and fire fighting system design in water supply and drainage system design.

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Influence of installation of S-shaped pipe offset on the water flow capacity of double stack drainage system in a high-rise building

Building Services Engineering Research and Technology ◽

10.1177/0143624419886096 ◽

2019 ◽

Vol 41 (5) ◽

pp. 603-622

Author(s):

Yuxi Guan ◽

Zheng Fang ◽

Jianping Yuan ◽

Zhi Tang

Keyword(s):

Discharge Capacity ◽

Pressure Fluctuation ◽

Flow Direction ◽

Drainage System ◽

Drainage Systems ◽

High Rise ◽

High Rise Building ◽

Maximum Discharge ◽

Drainage Capacity ◽

Water Seal

In high-rise and ultra-high-rise residential buildings, the drainage systems usually adopt the S-shaped offset pipe joint to avoid collisions of pipelines with beams and columns. However, the flow direction changes at the offset point would significantly affect the drainage capacity of the systems. To better understand the influence of pipe offset joints on the drainage capacity, three different building drainage systems namely YZW 1, YZW 2, and YZW 3 systems, were built up and investigated. YZW 1 system is a standard double-stack drainage system with anti-reflux H-tube joints. YZW 2 and YZW 3 systems were developed from YZW 1 by adding S-shape offset pipe joints on the 4th floor. An extra anti-reflux H-tube joint added 1 m above the offset joint as a measure for improving the drainage capacity differentiates YZW 3 system from YZW 2 system. The pressure fluctuation and water seal losses were adopted as experimental parameters to determine the maximum discharge capacity according to Standard for Capacity Test of Vertical Pipe of the Domestic Residential Drainage System. The experimental results show that the discharge capacity limitation of the drainage system with the offset joint is 6.5 L/s, which is much smaller than 11.0 L/s of the system without the offset joint. In the experiments with the offset joint, the pressure fluctuated fiercely at the position where flow direction changed and caused severe water seal losses of the floor drain and P-shaped trap. An anti-reflux H-tube joint above the original offset joint was observed to relieve the pressure fluctuation as an improvement and the drainage capacity was improved to some extent. The relationships among the maximum discharge rate, pressure fluctuation transients, and water seal losses were discussed. Lastly, a nondimensional analysis was adopted to understand the relationship between water seal losses and pressure limit values under different discharge rates for current test facilities. Practical application: A method has been tested and approved to effectively improve the discharge ability of a building drainage system that includes offset. The application of S-shape-offsets in high-rise building drainage systems can relieve the discharge congestion typically caused by standard pipe offset arrangements.

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Predicting air pressure in drainage stack of high-rise building

Applied Mathematics and Mechanics ◽

10.1007/s10483-013-1675-7 ◽

2013 ◽

Vol 34 (3) ◽

pp. 351-362 ◽

Cited By ~ 1

Author(s):

E. S. W. Wong ◽

Ying-lin Li ◽

Zuo-jin Zhu

Keyword(s):

Air Pressure ◽

High Rise ◽

High Rise Building

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Time-Variant Positive Air Pressure in Drainage Stacks as a Pathogen Transmission Pathway of COVID-19

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18116068 ◽

2021 ◽

Vol 18 (11) ◽

pp. 6068

Author(s):

Ling-Tim Wong ◽

Kwok-Wai Mui ◽

Cheng-Li Cheng ◽

Polly Hang-Mei Leung

Keyword(s):

Flow Rate ◽

Residential Buildings ◽

Virus Transmission ◽

Drainage System ◽

Pathogen Transmission ◽

Air Pressure ◽

Transmission Risk ◽

High Rise ◽

Pathogenic Virus ◽

Excessive Risk

Time-variant positive air pressure in a drainage stack poses a risk of pathogenic virus transmission into a habitable space, however, the excessive risk and its significance have not yet been sufficiently addressed for drainage system designs. This study proposes a novel measure for the probable pathogenic virus transmission risk of a high-rise drainage stack with the occurrence of positive air pressure. The proposed approach is based on time-variant positive air pressures measured in a 38 m high drainage stack of a full-scale experimental tower under steady flow conditions of flow rate 1–4 Ls−1 discharging at a height between 15 m to 33 m above the stack base. The maximum pressure and probabilistic positive air pressures in the discharging stack ventilation section with no water (Zone A of the discharging drainage stack) were determined. It was demonstrated that the positive air pressures were lower in frequency as compared with those in other stack zones and could propagate along the upper 1/3 portion of the ventilation pipe (H’ ≥ 0.63) towards the ventilation opening at the rooftop. As the probabilistic positive pressures at a stack height were found to be related to the water discharging height and flow rate, a risk model of positive air pressure is proposed. Taking the 119th, 124th, 140th and 11,547th COVID-19 cases of an epidemiological investigation in Hong Kong as a baseline of concern, excessive risk of system overuse was evaluated. The results showed that for a 20–80% increase in the frequency of discharge flow rate, the number of floors identified at risk increased from 1 to 9 and 1 to 6 in the 34- and 25-storey residential buildings, respectively. The outcome can apply to facilities planning for self-quarantine arrangements in high-rise buildings where pathogenic virus transmission associated with drainage system overuse is a concern.

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