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Integrated assessme...
Integrated assessment of indoor and outdoor ventilation in street canyons with naturally-ventilated buildings by various ventilation indexes
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- Yang, Xia (författare)
- Sun Yat-sen University, Guangzhou, PR China
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- Zhang, Yong (författare)
- Sun Yat-sen University, Guangzhou, PR China
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- Hang, Jian (författare)
- Sun Yat-sen University, Guangzhou, PR China
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- Lin, Yuanyuan (författare)
- Sun Yat-sen University, Guangzhou, PR China
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- Mattsson, Magnus, 1964- (författare)
- Högskolan i Gävle,Energisystem och byggnadsteknik,Indoor environment
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- Sandberg, Mats, 1945- (författare)
- Högskolan i Gävle,Energisystem och byggnadsteknik,Indoor environment
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- Zhang, Ming (författare)
- State Power Environmental Protection Research Institute, Nanjing, China
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- Wang, Kai (författare)
- Department of Civil, Environmental and Geomatic Engineering, University College, London, UK
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(creator_code:org_t)
- Elsevier, 2020
- 2020
- Engelska.
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Ingår i: Building and Environment. - : Elsevier. - 0360-1323 .- 1873-684X. ; 169
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The integrated assessments of indoor and outdoor ventilation are still rare so far. As a novelty, this paper aims to quantify the influence of street aspect ratios (building height/street width, H/W = 0.5–5) and window sizes (1 m × 1 m, 1.5 m × 1.5 m) on indoor-outdoor ventilation in two-dimensional streets with single-sided naturally-ventilated buildings. Numerical simulations with RNG k-ε model are validated against experimental data and the grid independence are tested as well. Air change rates per hour (ACH, h−1) are adopted for assessing indoor-outdoor ventilation by mean flows (ACHmean) and turbulent fluctuations (ACHturb) respectively. Age of air(τ), purging flow rate (PFR) and its corresponding ACHPFR are used to evaluate overall ventilation capacities.Shallower streets experience better indoor-outdoor ventilation. Outdoor ACHPFR drop from 14.69 to 17.55 h−1 to 3.96–3.97 h−1 as H/W rises from 0.5 to 3. In extremely deep canyon (H/W = 5), two-counter-rotating vortices produce much smaller velocity at low-level regions (U/Uref~10−3-10−5), resulting in small ACHPFR for outdoor (~0.76–0.91 h−1) and indoor in 1–13th floors (~0.03–0.61 h−1). When H/W = 0.5–1, leeward 5–6th floors experience smaller ACHPFR(e.g.~1.13–1.40 h−1 as H/W = 1) than the other floors (e.g. ~1.54–9.52 h−1 as H/W = 1). Particularly, as H/W = 2–3, leeward-side indoor ACHPFR in the middle floors (except the first and top two floors) are nearly constants (~1.02–1.69 h−1) and much smaller than windward-side ACHPFR(~1.41–4.35 h−1) which increase toward upper floors. Besides, the smaller window size reduces indoor ACHPFR by 19.38%~88.28%, but hardly influences outdoor ventilation. Moreover, both outdoor and indoor ACHPFR are greater than ACHmean but smaller than ACHmean + ACHturb. Although further investigations are still required, this paper provides an insight and scientific foundation on integrated indoor-outdoor ventilation evaluation with various effective ventilation indexes.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering (hsv//eng)
Nyckelord
- Computational fluid dynamics (CFD)
- Urban ventilation
- Building natural ventilation
- Air change rate per hour (ACH)
- Age of air
- Purging flow rate (PFR)
- Hållbar stadsutveckling
- Sustainable Urban Development
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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