scholarly journals AN ANALYTICAL MODEL ON STATIC SMOKE EXHAUST IN ATRIA

2010 ◽  
Vol 16 (3) ◽  
pp. 372-381 ◽  
Author(s):  
Cheuk Lun Chow ◽  
Junmei Li
Keyword(s):  
Fluid Dynamics ◽  
Driving Force ◽  
Natural Ventilation ◽  
Flow Model ◽  
Far East ◽  
Field Tests ◽  
The Far East ◽  
Smoke Layer ◽  
Simple Flow ◽  
Exhaust Systems

Static smoke exhaust systems with natural vents are starting to be installed in big shopping complexes, ware‐houses and cargo terminals in the Far East. These systems are used for natural ventilation as well as for letting out smoke. This paper responds to concerns over the performance of static smoke exhaust systems, which remain less popular than dynamic smoke exhaust systems with mechanical fans. We propose a modification of a simple flow model found in the literature, adapting this to study smoke layer interface height with natural vents opened. We compare and justify our results, as generated by both Computational Fluid Dynamics and zone models, alongside reports of historical field tests. The model of smoke exhaust is applied in an illustrative example of a large hall, leading to the suggestion that a flow model could be used for designing natural vents. As the key driving force in removing smoke through natural vents is smoke's own buoyancy, the system might only be effective for bigger fires. Santrauka Tolimuosiuose Rytuose statines dūmu šalinimo sistemos su natūralios ventiliacijos angomis pradedamos irengti dideliuose prekybos kompleksuose, sandeliuose ir kroviniu terminaluose. Tokios sistemos naudojamos ir natūraliai ventiliacijai, ir dūmams šalinti. Šis straipsnis parengtas susirūpinus, kad statines dūmu išmetimo sistemos yra ne tokios populiarios nei dinamines dūmu išmetimo sistemos su mechaniniais ventiliatoriais. Autoriai siūlo literatūroje aprašomo paprasto srauto modelio modifikacija, pritaikant ši modeli dūmu sluoksnio salyčio su natūralios ventiliacijos angomis aukščiui tirti. Straipsnyje palyginti ir pagristi rezultatai, gauti taikant tiek skaičiuojamosios skysčiu dinamikos, tiek zonavimo modelius kartu su eksperimentiniais tyrimais vietoveje. Pateiktas dūmu šalinimo modelio taikymo pavyzdys dideleje saleje ir padaryta išvada, kad srauto modelis galetu būti taikomas irengiant natūralia ventiliacija. Kadangi pagrindine varomoji jega šalinant dūmus per natūralias ventiliacijos angas yra dūmu plūdrumas, sistema gali būti veiksminga tik esant didesniems gaisrams.

On Evaluating Static Smoke Exhaust System in an Atrium

Volume 4 ◽  
2004 ◽  
Author(s):  
L. Yi ◽  
R. Huo ◽  
Y. Z. Li ◽  
W. K. Chow ◽  
N. K. Fong
Keyword(s):  
Far East ◽  
Exhaust System ◽  
Management Systems ◽  
Zone Model ◽  
Entrainment Rate ◽  
System A ◽  
The Far East ◽  
Smoke Layer ◽  
Simplified Calculation ◽  
Atrium Fire

Many atria are built in the Far East. Fire Safety is a concern and providing smoke management systems in atria is essential. For tall atria having difficulties to allocate space for air ductwork and fans of a dynamic smoke exhaust system, a smoke exhaust system with a ceiling vent is provided. The performance of the system should be evaluated and a two-layer zone model has been designed for such propose. The smoke layer temperature and interface height for a static smoke exhaust system in a tall space will be predicted. Based on the empirical formula derived from the entrainment rate of an axisymmetric plume and flow rate at a vent, a simplified calculation procedure of a static smoke exhaust in an atrium fire is proposed. Experiments were carried out at a full-scale burning facility of 27 m high, the USTC/PolyU Atrium, for verifying the results. It is found that the predicted smoke layer temperature and interface height agreed well with the experimental results. Therefore, the procedure is recommended to the authority as a tool in evaluating the performance of static smoke exhaust systems.

Atrium Smoke Exhaust and Technical Issues on Hot Smoke Tests

2005 ◽  
Author(s):  
W. K. Chow
Keyword(s):  
Far East ◽  
Exhaust System ◽  
Shopping Mall ◽  
Practical Case ◽  
Design Fire ◽  
The Far East ◽  
Technical Issues ◽  
Computational Fluid Dynamics Cfd ◽  
Typical Scenario ◽  
Exhaust Systems

Atriums are commonly designed in big building complexes while developing big cities in the Far East. It is not clear what the fire safety provisions are; nor whether those installed systems would work as expected. Dynamic smoke exhaust systems used to be installed. Other fire protection systems such as drencher system and sprinkler systems might be required. If the design of the dynamic smoke exhaust systems does not comply with the prescriptive code, hot smoke tests are required to be carried out in site for evaluating their performance. The smoke layer interface height induced by an agreed design fire is commonly checked. Technical issues on the procedure of hot smoke tests will be discussed in this paper. Problems encountered in designing smoke exhaust systems in the Far East will be outlined. A practical case is taken as an example. Application of Computational Fluid Dynamics (CFD) in evaluating the performance of atrium smoke exhaust systems will also be discussed. CFD is now a common engineering tool for designing smoke management systems by investigating the potential fire and smoke hazard. A typical scenario of having a fire in an adjacent shopping mall is considered. Performance of the dynamic smoke exhaust system in the atrium will be simulated.

scholarly journals FIRE SAFETY ASPECTS OF REFUGE FLOORS IN SUPERTALL BUILDINGS WITH COMPUTATIONAL FLUID DYNAMICS

2009 ◽  
Vol 15 (3) ◽  
pp. 225-236 ◽  
Author(s):  
Cheuk Lun Chow ◽  
Wan Ki Chow
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fire Safety ◽  
Emergency Services ◽  
Far East ◽  
Large Area ◽  
Water Curtain ◽  
High Rise ◽  
The Far East ◽  
Fire Codes

High-rise buildings in many big cities in the Far East, including Hong Kong, call for refuge floors as a matter of both practicality and compliance with regulations. Even though many countries’ fire codes are not clear in spelling out the necessity for refuge floors, it is accepted within construction that such floors are essential in resisting fire, allowing users a means of escape and allowing emergency services a means of access to stricken buildings. This paper discusses the reasons behind providing refuge floors, while also considering related fire safety provisions, such as their enclosure behind fire‐resistant construction or the protection of their openings behind a water curtain. Our discussion takes a tall building with balconies as a test example of refuge floors, running a hazard assessment based on Computational Fluid Dynamics assuming a fire of the broadly accepted level of 2 MW. The paper concludes that the design of the building's façade finally determines whether or not a refuge floor and associated fire safety provisions, such as a water curtain, can be waived. As the flat modelled used to store a high amount of combustibles up to 1135 MJm−2, the breaking of large area of glass window could lead to a major conflagration. The consequences of a scenario with a fire of 25 MW are also discussed. Santrauka Daugelio Tolimųjų Rytų didžiųjų miestų aukštuminiuose pastatuose, taip pat ir Honkongo, reikalingi saugos aukštai, paisant praktiškumo ir atitikimo reikalavimus. Netgi jei daugelio šalių gaisrinės saugos normos aiškiai nereglamentuoja būtinybės įrengti saugos aukštų, konstrukciniu požiūriu tokie aukštai yra būtini gaisrinei saugai, užtikrinant pastato naudotojams evakuacijos galimybę ir avarinėms tarnyboms patekimą į pastatą. Straipsnyje aptariamos saugos aukštų įrengimo priežastys, taip pat įvertinamos susijusios tokios gaisrinės saugos priemonės, kaip atsparių ugniai konstrukcijų įrengimas arba angų apsauga vandens užuolaida. Nagrinėjamas aukštuminis pastatas su balkonais, kaip eksperimentinis saugos aukštų pavyzdys, įvertinant pavojų. Tai daroma naudojant skysčių dinamikos modeliavimą ir plačiai pripažintą 2 MW galios gaisrą. Straipsnyje daromos išvados, kad pastato fasado projektiniai sprendiniai daro įtaką, ar saugos aukštai ir susijusios tokios gaisrinės saugos priemonės, kaip vandens užuolaida, gali būti nenumatomi. Jei pastate numatoma saugoti daug degiųjų medžiagų viršijant 1135 MJm–2 gaisro apkrovą, didelio ploto langų išdužimas gali veikti visuminį užsidegimą. Aptariami ir 25 MW galios gaisro scenarijaus padariniai.

The Far East is a territory of advanced development

Innotrans ◽  
2021 ◽  
pp. 11-14
Author(s):  
Valeriy M. Samuylov ◽  
◽  
Kirill D. Serov ◽  
Tatiana A. Kargapoltseva ◽  
◽  
...  
Keyword(s):  
Development Strategy ◽  
Driving Force ◽  
Far East ◽  
Federal District ◽  
Green Energy ◽  
The Far East ◽  
Northern Sea Route ◽  
New Generation ◽  
Far Eastern ◽  
Advanced Development

The article is devoted to the prospects of the development of the Far Eastern Federal District. The main projects implemented within the framework of the region’s development strategy until 2035 are considered. In particular, the Northern Sea Route is considered as a driving force for the development of the Far East, the problems of green energy - the new generation of energy sources introduced in the region are revealed.

Is there a regional culture in Russia? Opportunities of using a sociocultural approach in economics

2020 ◽  
pp. 108-126 ◽  
Author(s):  
V. A. Bryzgalin ◽  
Е. N. Nikishina
Keyword(s):  
Far East ◽  
Cross Cultural ◽  
Regional Culture ◽  
Russian Regions ◽  
Geographical Patterns ◽  
Cross Cultural Differences ◽  
The Far East ◽  
Sociocultural Approach ◽  
Critical Issues ◽  
Russian Universities

The paper investigates cross-cultural differences across Russian regions using the methodology of G. Hofstede. First, it discusses the most common approaches in measuring culture and the application of the Hofstede methodology in subnational studies. It identifies the critical issues in measuring culture at the regional level and suggests several strategies to address them. Secondly, the paper introduces subregional data on individualism and uncertainty avoidance using a survey of students across 27 Russian universities. The data allow to establish geographical patterns of individualism in Russia. It is demonstrated that collectivism is most prevalent in the Volga region, while individualism characteristic becomes stronger towards the Far East. The findings are robust to the inclusion of various controls and different specifications of the regression model. Finally, the paper provides a discussion about the potential of applying the sociocultural approach in economics.

The Portuguese Possessions in the Far East

1937 ◽  
Vol 6 (4) ◽  
pp. 45-47
Author(s):  
R. G. S.
Keyword(s):  
Far East ◽  
The Far East
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