20 results match your criteria Building Simulation[Journal]

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Study on the influence of voids on high-rise building on the wind environment.

Build Simul 2020 5;13(2):419-438. Epub 2019 Dec 5.

Welsh School of Architecture, Cardiff University, Cardiff, UK.

The purpose of this study was to investigate the effects of voids in tall buildings on the surrounding wind environment. With the development of modular technology, there has been a new method of building high-rise buildings. Currently, more and more high-rise buildings often use void spaces to reduce the wind resistance and utilize wind turbines by using wind power to create sky gardens. Read More

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http://dx.doi.org/10.1007/s12273-019-0584-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7094803PMC
December 2019

A modified turbulence model for simulating airflow aircraft cabin environment with mixed convection.

Build Simul 2020 Mar 26:1-11. Epub 2020 Mar 26.

1School of Mechanical Engineering, Tianjin University, Tianjin, 300350 China.

The forced convection (air supply jet) and the natural convection (thermal plume of passenger) co-exist in an aircraft cabin simultaneously. Due to the notable difference of the Reynolds numbers for the two convection processes, the traditional RANS method can hardly simulate the forced/natural convection flows accurately at the same time. In addition, the large geometric ratio between the main air supply inlet and the whole cabin leads to difficulties in grid generation for the cabin space. Read More

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http://dx.doi.org/10.1007/s12273-020-0609-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7100490PMC

Tracer gas is a suitable surrogate of exhaled droplet nuclei for studying airborne transmission in the built environment.

Build Simul 2020 Feb 21:1-8. Epub 2020 Feb 21.

2Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China.

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http://dx.doi.org/10.1007/s12273-020-0614-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090680PMC
February 2020

A numerical study of ventilation strategies for infection risk mitigation in general inpatient wards.

Build Simul 2020 Feb 22:1-10. Epub 2020 Feb 22.

Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China.

Aerial dispersion of human exhaled microbial contaminants and subsequent contamination of surfaces is a potential route for infection transmission in hospitals. Most general hospital wards have ventilation systems that drive air and thus contaminants from the patient areas towards the corridors. This study investigates the transport mechanism and deposition patterns of Middle East Respiratory Syndrome Coronavirus (MERS-CoV) within a typical six bedded general inpatient ward cubicle through numerical simulation. Read More

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http://dx.doi.org/10.1007/s12273-020-0623-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090571PMC
February 2020

Modeling transient particle transport by fast fluid dynamics with the Markov chain method.

Build Simul 2019 6;12(5):881-889. Epub 2019 Mar 6.

4Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, N.T., 999077, Hong Kong China.

Fast simulation tools for the prediction of transient particle transport are critical in designing the air distribution indoors to reduce the exposure to indoor particles and associated health risks. This investigation proposed a combined fast fluid dynamics (FFD) and Markov chain model for fast predicting transient particle transport indoors. The solver for FFD-Markov-chain model was programmed in OpenFOAM, an open-source CFD toolbox. Read More

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http://dx.doi.org/10.1007/s12273-019-0513-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090511PMC

The influence of envelope features on interunit dispersion around a naturally ventilated multi-story building.

Build Simul 2018 18;11(6):1245-1253. Epub 2018 Jul 18.

5Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, China.

This study examines the influence of building envelope features on interunit dispersion around multi-story buildings, when the presence of an upstream interfering building is also considered. Validated CFD methods in the steady-state RANS framework are employed. In general, the reentry ratios of pollutant from a source unit to adjacent units are mostly in the order of 0. Read More

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http://dx.doi.org/10.1007/s12273-018-0460-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090705PMC

A simple method for differentiating direct and indirect exposure to exhaled contaminants in mechanically ventilated rooms.

Build Simul 2018 17;11(5):1039-1051. Epub 2018 Mar 17.

6School of Civil Engineering, ZJU-UIUC, Zhejiang University, Haining, 314400 China.

Many airborne infectious diseases can be transmitted via exhaled contaminants transported in the air. Direct exposure occurs when the exhaled jet from the infected person directly enters the breathing zone of the target person. Indirect exposure occurs when the contaminants disperse in the room and are inhaled by the target person. Read More

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http://dx.doi.org/10.1007/s12273-018-0441-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090611PMC

Large-eddy simulation of the containment failure in isolation rooms with a sliding door-An experimental and modelling study.

Build Simul 2018 6;11(3):585-596. Epub 2017 Nov 6.

3Leicester Royal Infirmary, University Hospitals Leicester, Leicester, UK.

In hospital isolation rooms, door operation can lead to containment failures and airborne pathogen dispersal into the surrounding spaces. Sliding doors can reduce the containment failure arising from the door motion induced airflows, as compared to the hinged doors that are typically used in healthcare facilities. Such airflow leakage can be measured quantitatively using tracer gas techniques, but detailed observation of the turbulent flow features is very difficult. Read More

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http://dx.doi.org/10.1007/s12273-017-0422-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7091416PMC
November 2017

Air infiltration induced inter-unit dispersion and infectious risk assessment in a high-rise residential building.

Build Simul 2018 10;11(1):193-202. Epub 2017 Jul 10.

3School of Civil Engineering, HeFei University of Technology, HeFei, China.

Identifying possible airborne transmission routes and assessing the associated infectious risks are essential for implementing effective control measures. This study focuses on the infiltration-induced inter-unit pollutant dispersion in a high-rise residential (HRR) building. The outdoor wind pressure distribution on the building facades was obtained from the wind tunnel experiments. Read More

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http://dx.doi.org/10.1007/s12273-017-0388-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090850PMC

Multi-objective optimization for sensor placement against suddenly released contaminant in air duct system.

Build Simul 2018 16;11(1):139-153. Epub 2017 May 16.

1School of Mechanical Engineering, Tongji University, Shanghai, 200092 China.

When a chemical or biological agent is suddenly released into a ventilation system, its dispersion needs to be promptly and accurately detected. In this work, an optimization method for sensors layout in air ductwork was presented. Three optimal objectives were defined, i. Read More

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http://dx.doi.org/10.1007/s12273-017-0374-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7091264PMC

Evolution of large-scale flow structures and traces of marked fluid particles within a single-aisle cabin mock-up.

Build Simul 2017 27;10(5):723-736. Epub 2017 Feb 27.

1School of Aerospace Engineering, Tsinghua University, Beijing, 100084 China.

Over the past several decades, rapidly growing popularity of airline transportation has pushed many passengers and crew to focus on potential risk of contaminant transmission during commercial air travel. Understanding airflow dynamics and transport property within an aircraft cabin is critical to creating a healthy cabin environment and improving control of epidemics. This work reveals the temporal and spatial evolution process of large-scale flow structures around the aisle region and evaluates impact of airflow's large-scale flow structures (swing motion around the aisle region and large-scale vortices) on transport property by calculating traces of marked fluid particles (MFPs) passing through passengers' exhalation area within a Boeing 737-200 cabin mock-up. Read More

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http://dx.doi.org/10.1007/s12273-017-0351-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7091181PMC
February 2017

Multi-zone simulation of outdoor particle penetration and transport in a multi-story building.

Build Simul 2017 20;10(4):525-534. Epub 2016 Dec 20.

4Department of Architecture and Architectural Engineering, College of Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826 Republic of Korea.

In areas with poor ambient air quality, indoor particle concentrations can be significantly affected by particulate matter originating outdoors. The indoor environments of multi-zone and multi-story buildings are affected differently by outdoor particles compared with single-family houses, because of the buildings' more complicated airflow characteristics. The objective of this study is to analyze outdoor particle penetration and transport, and their impact on indoor air, in a multi-zone and multi-story building using a CONTAMW simulation. Read More

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http://dx.doi.org/10.1007/s12273-016-0340-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090779PMC
December 2016

Particle transport characteristics in indoor environment with an air cleaner: The effect of nonuniform particle distributions.

Build Simul 2017 17;10(1):123-133. Epub 2016 Aug 17.

Key Laboratory of Condition Monitoring and Control for Power Plant Equipments of Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing, China.

Air cleaners are expected to improve the indoor air quality by removing the gaseous contaminants and fine particles. In our former work, the effects of the air cleaner on removing the uniformly distributed particles were numerically investigated. Based on those results, this work further explores the performances of the air cleaner in the reduction of two nonuniform particle distributions generated by smoking and coughing. Read More

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http://dx.doi.org/10.1007/s12273-016-0310-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7091404PMC

Coupling the Multizone Airflow and Contaminant Transport Software CONTAM with EnergyPlus Using Co-Simulation.

Build Simul 2016 Aug 4;9(4):469-479. Epub 2016 Feb 4.

Engineering Laboratory, National Institute of Standards and Technology, 100 Bureau Drive Gaithersburg, MD 20899.

Building modelers need simulation tools capable of simultaneously considering building energy use, airflow and indoor air quality (IAQ) to design and evaluate the ability of buildings and their systems to meet today's demanding energy efficiency and IAQ performance requirements. CONTAM is a widely-used multizone building airflow and contaminant transport simulation tool that requires indoor temperatures as input values. EnergyPlus is a prominent whole-building energy simulation program capable of performing heat transfer calculations that require interzone and infiltration airflows as input values. Read More

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http://dx.doi.org/10.1007/s12273-016-0279-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4873778PMC
August 2016
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Person to person droplets transmission characteristics in unidirectional ventilated protective isolation room: The impact of initial droplet size.

Build Simul 2016 11;9(5):597-606. Epub 2016 Apr 11.

1Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Department of Building Science, Tsinghua University, Beijing, 100084 China.

Person to person droplets/particles or contaminant cross transmission is an important issue in ventilated environment, especially in the unidirectional ventilated protective isolation room (UVPIR) where the patient's immune system is extremely low and easily infected. We simulated the dispersion process of the droplets with initial diameter of 100 μm, 10 μm and gaseous contaminant in unidirectional ventilated protective isolation room and studied the droplets dispersion and cross transmission with different sizes. The droplets with initial size of 100 μm settle out of the coughing jet quickly after coming out from mouth and cannot be carried by the coughing jet to the human thermal plume affecting (HTPA) zone of the susceptible manikin. Read More

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http://dx.doi.org/10.1007/s12273-016-0290-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7091150PMC

Role of air changes per hour (ACH) in possible transmission of airborne infections.

Build Simul 2012 22;5(1):15-28. Epub 2011 Dec 22.

Department of Health and Human Services, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892 USA.

The cost of nosocomial infections in the United States is estimated to be $4 billion to $5 billion annually. Applying a scientifically based analysis to disease transmission and performing a site specific risk analysis to determine the design of the ventilation system can provide real and long term cost savings. Using a scientific approach and convincing data, this paper hypothetically illustrates how a ventilation system design can be optimized to potentially reduce infection risk to occupants in an isolation room based on a thorough risk assessment without necessarily increasing ventilation airflow rate. Read More

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http://dx.doi.org/10.1007/s12273-011-0053-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090659PMC
December 2011

Experimental verification of tracking algorithm for dynamically-releasing single indoor contaminant.

Build Simul 2012 24;5(1):5-14. Epub 2011 Jun 24.

3School of Environmental Science and Technology, Tianjin University, Tianjin, 300072 China.

Identifying contaminant sources in a precise and rapid manner is critical to indoor air quality (IAQ) management as disclosed source information can facilitate proper and effective IAQ controls in environments with airborne infection, fire smoke and chemical pollutant release etc. Probability-based inverse modeling method was shown feasible for locating single instantaneous source in IAQ events. To tackle more realistic sources of continuous release, this paper advances the method to identify continuously releasing single contaminant source. Read More

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http://dx.doi.org/10.1007/s12273-011-0041-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090956PMC

Application of building simulation tools for studying airborne infection and its control.

Authors:
Yuguo Li Bin Zhao

Build Simul 2012 14;5(1):3-4. Epub 2012 Mar 14.

2Department of Building Science School of Architecture, Tsinghua University, Beijing, 100084 China.

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http://dx.doi.org/10.1007/s12273-012-0072-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090495PMC

Hospital ventilation simulation for the study of potential exposure to contaminants.

Authors:
Carla Balocco

Build Simul 2011 4;4(1):5-20. Epub 2011 Dec 4.

Department of Energy Engineering "Sergio Stecco", via S. Marta 3, 50139 Firenze, Italy.

Airflow and ventilation are particularly important in healthcare rooms for controlling thermo-hygrometric conditions, providing anaesthetic gas removal, diluting airborne bacterial contamination and minimizing bacteria transfer airborne. An actual hospitalization room was the investigate case study. Transient simulations with computational fluid dynamics (CFD), based on the finite element method (FEM) were performed to investigate the efficiency of the existing heating, ventilation and air-conditioning (HVAC) plant with a variable air volume (VAV) primary air system. Read More

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http://dx.doi.org/10.1007/s12273-011-0019-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7090620PMC
December 2011

Investigating a safe ventilation rate for the prevention of indoor SARS transmission: An attempt based on a simulation approach.

Build Simul 2009 4;2(4):281-289. Epub 2009 Dec 4.

Department of Building Science, School of Architecture, Tsinghua University, Beijing, 100084 China.

This paper identifies the "safe ventilation rate" for eliminating airborne viral infection and preventing cross-infection of severe acute respiratory syndrome (SARS) in a hospital-based setting. We used simulation approaches to reproduce three actual cases where groups of hospital occupants reported to be either infected or not infected when SARS patients were hospitalized in nearby rooms. Simulations using both computational fluid dynamics (CFD) and multi-zone models were carried out to understand the dilution level of SARS virus-laden aerosols during these scenarios. Read More

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http://dx.doi.org/10.1007/s12273-009-9325-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7091190PMC
December 2009
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