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Numerical simulation study on the effect of internal heat source on pumping ventilation Int. J. Vent. (IF 1.5) Pub Date : 2024-02-23 Haitao Zhao, Junli Zhou, Xue Xiao, Wenjun Zhu, Xinpeng Qiu, Jiaji Zhang, Wei Yang
Natural ventilation is a passive building technology that can reduce energy consumption for mechanical cooling of the indoor environment. Natural ventilation technology has received renewed attenti...
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Wind-induced ventilation rate of single-sided ventilation in a building with internal partition Int. J. Vent. (IF 1.5) Pub Date : 2024-02-21 Zitao Jiang, Tomohiro Kobayashi, Toshio Yamanaka, Mats Sandberg, Narae Choi, Noriaki Kobayashi, Kayuki Sano, Kota Toyosawa
Wind-induced single-sided ventilation is a prevalent form of natural ventilation extensively used in buildings. Nevertheless, prior experimental investigations predominantly focused on single-zone ...
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Optimal ventilation mode for double fires in a typical interchange subway station Int. J. Vent. (IF 1.5) Pub Date : 2024-02-12 Fan Wu, Dan Wu, Yongmei Hao, Juncheng Jiang
This paper investigates the optimal ventilation mode for double fires in a typical interchange subway station. Numerical simulations were carried out in a full-scale subway station with different h...
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An investigation concerning optimal design of confluent jets ventilation with variable air volume Int. J. Vent. (IF 1.5) Pub Date : 2024-01-19 Harald Andersson, Mathias Cehlin, Bahram Moshfegh
This parametric study aims to predict the performance of confluent jets ventilation (CJV) with variable air volume (VAV) from four CJV design parameters. A combination of computational fluid dynami...
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A comparative analysis of potential aerosol exposure in a wide-body aircraft cabin using tracer gas and fluorescent particles Int. J. Vent. (IF 1.5) Pub Date : 2023-12-14 Seif Mahmoud, James Bennett, Byron Jones, Mohammad Hosni
We compare two aerosol surrogate tracers in aircraft cabins for breathing and coughing sources: tracer gas collected in the ACER Boeing 767 mock-up and fluorescent particles collected in an actual ...
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A theoretical calculation method for critical air velocity to prevent methane draft pressure-caused airflow reversion based on oscillation theory Int. J. Vent. (IF 1.5) Pub Date : 2023-11-23 Zeqi Wu, Kai Wang, Huaitao Song, Kun Wang, Lin Shao
Methane draft pressure is a secondary disaster for mine ventilation following coal and gas outbursts, which poses a long-term threat to coal mining and workers’ safety. To study the law of methane ...
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Impacts of horizontal and vertical louvers on the natural cross-ventilation performance of a generic building Int. J. Vent. (IF 1.5) Pub Date : 2023-11-06 Reza Rahimi, Rahim Hassanzadeh
Wind-based natural cross-ventilation is defined as a process in which fresh air is injected into a building via a high-pressure windward window and exhausts into the atmosphere through a low-pressu...
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Validation of simulated velocity distribution in isothermal mixing ventilation cases with particle streak tracking Int. J. Vent. (IF 1.5) Pub Date : 2023-10-19 Gerrid Brockmann, Anne Hartmann, Martin Kriegel
This is a validation study for the velocity distribution in mixing ventilation. Two different supply air diffusers a slot and a swirl diffuser form two different room airflows. For the swirl diffus...
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Simulation of backflow during the dynamic containment of airlocks Int. J. Vent. (IF 1.5) Pub Date : 2023-09-24 Brahim Mohammedi, Athmane Gheziel, Nacim Mellel, M’hamed Salhi
Decontamination processes in nuclear facilities require the implementation of ventilated airlocks around the contaminated equipment to prevent leakage of radioactive materials toward the surroundin...
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Experimental study on air extraction performance of novel rooftop natural ventilators Int. J. Vent. (IF 1.5) Pub Date : 2023-08-30 Kwan Ouyang, Tzeng-Yuan Chen, Wei-Jen Mao
The air extraction performance of novel rooftop natural ventilators was experimentally investigated and compared to the conventional turbine ventilator. The newly developed ventilator integrates a ...
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Guest editorial: Ventilation challenges in a changing world - Selected papers from the 42nd AIVC Conference, 5–6 October 2022 Int. J. Vent. (IF 1.5) Pub Date : 2023-06-27 Arnold Janssens, Maria Kapsalaki
Published in International Journal of Ventilation (Vol. 22, No. 4, 2023)
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Evaluation of thermal resilience to overheating for an educational building in future heatwave scenarios Int. J. Vent. (IF 1.5) Pub Date : 2023-06-01 Abantika Sengupta, Hilde Breesch, Douaa Al Assaad, Marijke Steeman
Airtight and highly insulated buildings are subjected to overheating risks, even in moderate climates, due to unforeseeable events like frequent heatwaves and power outages. Educational buildings s...
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Air leakage detection in building façades by combining lock-in thermography with blower excitation Int. J. Vent. (IF 1.5) Pub Date : 2023-04-27 Benedikt Kölsch, Johannes Pernpeintner, Björn Schiricke, Eckhard Lüpfert
Air leakage in building envelopes is responsible for a large portion of the building’s heating and cooling requirements. Therefore, fast and reliable detection of leaks is crucial for improving ene...
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The effect of airflow guiding components on effective ventilation rates in single-sided ventilation applications Int. J. Vent. (IF 1.5) Pub Date : 2023-04-23 Nima Najafi Ziarani, Malcolm Cook, Paul D. O’Sullivan
Wind-driven single-sided ventilation (SSV) is present in many existing buildings across Europe, and with new near-zero energy building (NZEB) regulations for the refurbishment of the existing build...
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The indoor environmental quality and energy savings potential of room ventilation units compared to exhaust-only ventilation systems in France Int. J. Vent. (IF 1.5) Pub Date : 2023-04-21 Vasileios Filis, Kevin Michael Smith, Jakub Kolarik, Frédéric Kuznik, Lucie Merlier
Humidity-controlled mechanical exhaust ventilation (RH-MEV) has been widely used in France for over 35 years, demonstrating high durability and robustness. This exhaust-only ventilation strategy is...
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A preliminary assessment of the health impacts of indoor air contaminants determined using the DALY metric Int. J. Vent. (IF 1.5) Pub Date : 2023-04-18 Giobertti Morantes, Benjamin Jones, Max Sherman, Constanza Molina
Common metrics used for assessing air quality are based on guidelines and/or standards for regulating concentrations that should not be exceeded over a period. Exceeding those values would represen...
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Assessing the “sufficient ventilation” requirement for Austrian buildings: development of a Monte Carlo based spreadsheet calculation to estimate airing intervals and mould risk in window ventilated buildings Int. J. Vent. (IF 1.5) Pub Date : 2023-04-18 Gabriel Rojas, Andreas Greml, Rainer Pfluger, Peter Tappler
In Austria the lack of guidelines or standards has caused many discussions and disputes on the question if “sufficient ventilation” can be ensured with window airing only, in particular in newly co...
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IAQ in CCU units: an experimental and numerical investigation based on the outlet air height (case study: Namazi Hospital, Shiraz) Int. J. Vent. (IF 1.5) Pub Date : 2023-04-16 Forough Farhadi, Mehdi Khakzand, Hasim Altan, Saeid Chahardoli
Abstract Indoor air quality (IAQ) is a significant concern that affects our health. Recent studies show how poor IAQ amplifies the effects of airborne viruses, which endanger the health of the population relative to the COVID-19. This study aims to find the relationship among IAQ, the location of the air outlet valve and the behavior of the IAQ indicators in the cardiac care unit (CCU) at Namazi Hospital
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Effectiveness of personalized ventilation in reducing airborne infection risk for long-term care facilities Int. J. Vent. (IF 1.5) Pub Date : 2023-04-10 Marloes M. A. de Haas, Marcel G. L. C. Loomans, Marije te Kulve, Atze C. Boerstra, Helianthe S. M. Kort
Throughout history, the human population has experienced major outbreaks of infectious diseases. In December 2019 the previously unknown SARS-CoV-2 virus emerged, which had a huge impact globally. ...
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Impact of ventilation type on indoor generated PM and VOC levels for different indoor activities Int. J. Vent. (IF 1.5) Pub Date : 2023-04-07 Kevin Verniers, Frederik Losfeld, Ivan Pollet, Jelle Laverge
Residential ventilation systems target in an energy efficient manner an indoor atmosphere fulfilling people’s desired comfort requirements with regard to CO2, temperature, and RH. However, the reac...
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Editorial. Ventilation: a focused subject with broad impacts Int. J. Vent. (IF 1.5) Pub Date : 2023-04-04 Jianshun "Jensen" Zhang
Published in International Journal of Ventilation (Vol. 22, No. 1, 2023)
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Impact of thermal inertia coupled to natural night ventilation. A case study for a high performance building in continental climate Int. J. Vent. (IF 1.5) Pub Date : 2023-03-20 Sarah Truchet, Arnaud Jay, Etienne Wurtz, Jocelyn Anger, Adrien Brun, Pierre Bernaud
In summer time, thermal inertia appears as a passive solution to improve the thermal comfort in many part of Europe. The objective of this paper is in a first step to generate thermal comfort data ...
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The effect of atrium configurations on energy usage and natural ventilation in high-rise office buildings in Tehran climate Int. J. Vent. (IF 1.5) Pub Date : 2023-03-13 Meysam Daloe Heydari, Abdulhamid Ghanbaran, Mostafa Varmazyar
Most buildings in Iran, including Tehran, have not yet met the requirements of climate design. In addition, they do not seem to have their traditional Iranian architecture. The present study aims t...
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Stilt houses in Southeastern and Northern European climate conditions Int. J. Vent. (IF 1.5) Pub Date : 2023-03-12 Nebojša Lukić, Davor Jovanović, Novak Nikolić
The comparison of the annual specific primary energy consumption (SPEC) of the different stilt house models and corresponding slab-on house (SOH), the stilt house with fully opened (SWAC) and fully...
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The preliminary evaluation of design guidelines of stratum ventilation in a large tropical lecture hall Int. J. Vent. (IF 1.5) Pub Date : 2023-01-04 Y. H. Yau, Y.K. Chuah, K. H. Chuah, U. A. Rajput, H. J. Liew
Abstract This article presents a study conducted to test the design guidelines of stratum ventilation (SV) for the conditions set in the tropics (Malaysia). Three different ventilation strategies and six different cases for SV were designed and examined by varying the layout of the return outlets and the air change per hour values. The ventilation strategy with a return outlet at the same level on
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Modeling particle distribution in a ventilated room with modified discrete random walk methods Int. J. Vent. (IF 1.5) Pub Date : 2022-11-15 Shahrzad Marashian, Sasan Sadrizadeh, Omid Abouali
Abstract The airflow and micro-particle dispersion in a 3-D ventilated scaled room has been simulated numerically. The flow field was studied by the Eulerian method using a Reynolds Averaged Navier-Stokes model, and we used the Lagrangian approach to solve the equations of particle motion. The purpose is to evaluate and compare various discrete random walk methods (DRW) and continuous random walk methods
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Visibility analysis by light attenuation ratio recorded with portable camera at the full-scale hot smoke test site Int. J. Vent. (IF 1.5) Pub Date : 2022-07-24 ChungHwei Su, ChiaYuan Shih, ShiuanCheng Wang, MingJe Tsai
Abstract Some countries have enacted the full-scale hot smoke test standards to verify the effectiveness of smoke extraction systems. Unfortunately, the judgment of most performed tests is based on vision and lacks scientific value. It is important to establish a scientific and quantifiable measurement system for visibility judgment in a large space. This paper analyzed the visibility values obtained
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Multi-branch joint adjustment method of mine ventilation based on sensitivity Int. J. Vent. (IF 1.5) Pub Date : 2022-05-23 Haiqing Hao, Shuguang Jiang, Kai Wang, Yucheng Zhang, Zhengyan Wu
Abstract The sensitivity analysis is an important analysis method to realize the intelligent control of branch air volume for the mine ventilation network. Aiming at the current situation that the ventilation on-demand (VOD) regulation cannot meet the large demand for air volume in specific air consumption branches in mine, this paper proposed a multi-branch wind resistance joint regulation method
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Study on orientation and number of water spray nozzles for scientific experimental application Int. J. Vent. (IF 1.5) Pub Date : 2022-05-16 Pravinth Balthazar, Norwahida Yusoff, Mohd Azmi Ismail
Abstract In dry climates, evaporative cooling techniques are frequently used in place of air-conditioners to increase energy efficiency and reduce installation costs. An evaporative nozzle is a type of evaporative cooling technique. Evaporative nozzle spraying is a technique that is used in a variety of applications, including cooling and humidification. The performance of evaporative spray nozzles
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Effect of different setups, protective screens and air supply systems on the exposure to aerosols in a mock-up restaurant Int. J. Vent. (IF 1.5) Pub Date : 2022-05-05 Roberto A. A. L. Traversari, Robert A. Bezemer, Stefan P. M. van Heumen, Karin Kompatscher, Menno J. Hinkema, Iris Eekhout
Abstract Social distancing measures to lower the risk of SARS-CoV-2 transmission limit seating capacity in and constrain restaurants’ ability to operate in an economically sustainable way. Experiments have been conducted in a real-size mock-up of a restaurant, using different table setting and configurations of the ventilation system. The study has analysed the effects on total exposure to aerosols
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Influence of heating systems on indoor air quality and sick building syndrome (a case study in Qom, Iran) Int. J. Vent. (IF 1.5) Pub Date : 2022-04-26 Mehdi Salari, Fatemeh Sadat Tabatabaei, Reza Fouladi-Fard, Abolfazl Mohammadbeigi, Azam Nadali, Mohammad Fahiminia, Maria Fiore
Abstract Sick building syndrome (SBS) is an outcome of poor indoor air quality (IAQ) that can affect human health and performance. Heating system (HS) types are a factor of indoor air emission. The present study was conducted to evaluate the effect of the HS on IAQ and SBS in residential buildings. The air pollutant levels were monitored in the heating-season and non-heating-season. The SBS questionnaire
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Measurements on the surface wind pressure characteristics of a thousand-meter scale megatall building by wind tunnel test Int. J. Vent. (IF 1.5) Pub Date : 2022-04-23 Junliang Cao, Xuejiao Peng, Xiaoxin Man, Yue Li, Jing Liu
Abstract This paper investigates the wind pressure distribution of a thousand-meter scale megatall building through a wind tunnel test. One key challenge is that the power-law wind profiles are not applicable due to the height limitation. Therefore, a mesoscale meteorological model WRFv3.4 (Weather Research & Forecasting Model) was used to explore the wind profile covering the height of the thousand-meter
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Ventilation performance analysis on low-rise courtyard building for various courtyard shape factors and roof topology Int. J. Vent. (IF 1.5) Pub Date : 2022-02-06 D. Prakash
Abstract Residential buildings in the street canyon are highly suffering from reduced natural ventilation since the surrounding buildings completely mask the window and door openings. For such buildings, ventilation through the roof is an excellent method, and the buildings with courtyard space are believed to provide good ventilation and comfort. However, proper designing of courtyard buildings is
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From energy crisis to sustainable indoor climate – 40 years of AIVC Selected papers from the 40th AIVC Conference, 15–16 October 2019 Int. J. Vent. (IF 1.5) Pub Date : 2021-12-09 Arnold Janssens, Maria Kapsalaki
(2021). From energy crisis to sustainable indoor climate – 40 years of AIVC Selected papers from the 40th AIVC Conference, 15–16 October 2019. International Journal of Ventilation: Vol. 20, From energy crisis to sustainable indoor climate – 40 years of AIVC Selected papers from the 40th AIVC Conference, 15–16 October 2019. Guest Editors: Arnold Janssens and Maria Kapsalaki, pp. 159-160.
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Influence of the train running on the fire smoke spread characteristics in the rescue station Int. J. Vent. (IF 1.5) Pub Date : 2021-11-23 Yuanlong Zhou, Honglin Wang, Haiquan Bi
Abstract Rescue station is an important part of the extra-long railway tunnel, which can provide smoke-free refuge for evacuated passengers. For the fire research of the rescue station, the influence of the burning train running on the smoke spread characteristics has not been considered in the previous studies. In this work, the influence of the train running on the fire smoke spread characteristics
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An alternative air distribution solution for better environmental quality in the ISS crew quarters Int. J. Vent. (IF 1.5) Pub Date : 2021-09-13 Matei Razvan Georgescu, Amina Meslem, Ilinca Nastase, Laurentiu Tacutu
Abstract This article presents the study of a ventilation solution using cross-flow fans for the crew quarters (CQ) aboard the International Space Station. Currently the CQ uses two axial fans for ventilation, which occasionally generate insufficient flow rate or acoustic issues. A ventilation circuit using two cross-flow fans was designed, its acoustic performance was measured and the flow was investigated
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Numerical simulation of droplet aerosol transmission in an enclosed space Int. J. Vent. (IF 1.5) Pub Date : 2021-09-09 Zhenhai Wu, Qing Xu, Changming Ling
Abstract A three-dimensional model of an enclosed air-conditioned space was established. Numerical simulation was conducted for the temperature distribution in the enclosed space with the air conditioner turned on using computational fluid dynamics, and the movement track of aerosol droplets exhaled by a patient in the enclosed space was traced using the discrete phase model based on the Eulerian–Lagrangian
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Assessing the impact of pressure drop and leak distribution on ductwork airtightness measurements Int. J. Vent. (IF 1.5) Pub Date : 2021-08-31
Abstract Ductwork airtightness test protocols implicitly assume that the pressure across the leaks is identical for all leaks. In fact, the pressure difference at the leaks decreases in absolute value as the distance from the moving air increases, due to friction and dynamic losses. This paper aims to quantify the impact of these pressure losses on airtightness test results, and thereby the measurement
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Analytical model of semi-transparent photovoltaic double-skin façade system (STPV-DSF) for natural and forced ventilation modes Int. J. Vent. (IF 1.5) Pub Date : 2021-08-31
Abstract An analytical model has been developed for simulating the semi-transparent photovoltaic double-skin façade (STPV-DSF) system to assess its overall performance. The STPV-DSF integrated building can generate electricity, provide daylight illuminance in its indoor area and lowers the energy demand of a building. During the building design phase, complex simulations are required to estimate the
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Quantification of air leakage paths: a comparison of airflow and acoustic measurements Int. J. Vent. (IF 1.5) Pub Date : 2021-08-31
Abstract Today, the fan pressurization method is the most frequently used method to evaluate a building's airtightness. However, the localization and quantification of leaks remain difficult. In this paper, an acoustic method is introduced to estimate the leakage size of single leaks. Acoustic and airflow measurements were conducted and compared in laboratory tests within the same boundary conditions
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Theory of RPOD adjustment of air volume for mine intelligent ventilation Int. J. Vent. (IF 1.5) Pub Date : 2021-07-14 Peng Jia, Jinzhang Jia, Lei Song, Zhuang Li, Bin Li
Abstract The intelligentization of mine ventilation is the inevitable development trend of ventilation system. Rapid, precise, and on-demand (RPOD) adjustment of air volume is one of the main problems that need to be solved in mine intelligent ventilation. In order to realize RPOD adjustment of air volume, the concepts of target branch, active branch and passive branch were elaborated and an algorithm
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A farmers market architecture and ventilation design and its airflow analysis Int. J. Vent. (IF 1.5) Pub Date : 2021-07-09 Lei Chen, Chunhua Huang, Cheng Xu
Abstract Green buildings and sustainable designs require architectural designers to go beyond the basic building codes to improve overall building energy performance, optimize building ventilation, minimize life-cycle environmental impacts and make comfortable inside living environments. This paper briefly introduces the green design of the Lituo farmers market. Improving air quality inside of the
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Experiments of combinational fans affecting smoke ceiling in an undersea metro interval tunnel VSES Int. J. Vent. (IF 1.5) Pub Date : 2021-06-30 Shiqiang Chen, Siyu Fan, Ruohong Jin, Zhulong Zhu, Yihan Chen, Fangxing Chen, Haiqiao Wang
Abstract Based on a case study of the undersea metro interval tunnel, this study proposes a model to evaluate the Ventilation and Smoke Exhaust System (VSES). In the VSES experiments, data of fan frequencies, powers, velocities, and static pressures in carriageways are collected, under the TPTE (Two Pressing-in fans + Two Extracted-out fans), the TPOEL (Two Pressing-in fans + One Extraction fan on
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The design and testing of unidirectional airflow operating theatres Int. J. Vent. (IF 1.5) Pub Date : 2021-04-28 W. Whyte, C. A. Mackintosh, W. M. Whyte
Abstract This article discusses the design of unidirectional airflow systems used to ventilate operating theatres and provide low concentrations of airborne micro-organisms during surgical operations. Also described are tests that can be used to confirm that unidirectional airflow systems are well designed and perform correctly when installed and during their lifetime. Reasons are given for the failure
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The investigation of air temperature characteristics in large-span manufacture area of clean room Int. J. Vent. (IF 1.5) Pub Date : 2021-04-27 Liandong Dong, Ke Zhang, Zhen Qian
Abstract The main aim of this study is to predict the temperature characteristics in large-span manufacture area of clean room using the Computational Fluid Dynamics (CFD). The CFD model was established based on a large semiconductor plant and verified by measured data. Then, the effects of these factors including fan filter unit (FFU) configuration, building envelope and fresh air system on temperature
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Applicability of a simple and new airtightness measuring method and further comparisons with blower door measurements Int. J. Vent. (IF 1.5) Pub Date : 2021-04-02 Timothy Lanooy, Niek-Jan Bink, Wim Kornaat, Wouter Borsboom
Abstract The building airtightness is essential to achieve a high energy performance. In most countries however, it is not mandatory to measure the airtightness. In the Netherlands it is common practice to just take several samples in a housing project. These samples do not give a good indication for all the buildings in a project. It is therefore important to measure the airtightness of all the buildings
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Learning from Chinese traditional architecture: field test and CFD modelling of ventilation enhancement techniques in southern Chinese houses Int. J. Vent. (IF 1.5) Pub Date : 2021-03-25 Yicun Hou, Angui Li, Sen Mei
Abstract A traditional residence is not only a symbol of historic wisdom, but also represents the development of superior building experience. The weather in regions south of the Yangtze River is wet and hot; therefore, the local people have taken many effective measures to improve their indoor environment, such as the reasonable layout of windows, the effect of double pitch roofs and the effect of
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Thermal performance analysis of naturally ventilated and perforated sheet based double skin facade system for hot summer conditions Int. J. Vent. (IF 1.5) Pub Date : 2021-03-22 Manoj Kumar Sharma, Sajan Preet, Jyotirmay Mathur, Amartya Chowdhury, Sanjay Mathur
Abstract A new skin of perforated sheets in the cavity of double skin facades (DSF) system is introduced for efficient heat removal from the cavity in hot summer conditions. In this paper, the analytical solution is developed to estimate the thermal performance of the double-skin façade system with and without perforated sheet operating under natural ventilation mode. This analytical model is designed
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Disturbance of a laminar air flow caused by differently shaped surgical lights Int. J. Vent. (IF 1.5) Pub Date : 2021-03-01 Valeria Hofer, Anne Hartmann, Hansjörg Rotheudt, Benjamin Zielke, Martin Kriegel
Abstract In operating rooms with unidirectional air flow a wake is formed below the light. The influence of the geometry on the dimension of the wake and the age of air were investigated by means of validated numerical simulations as well as experimental measurements. The vertical dimension of the wake caused by the circular surgical light was 1.08 m in height. With an air-permeable shape, it could
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Experimental and simulation studies on hybrid ventilation in interlayer of underground depot with superstructure Int. J. Vent. (IF 1.5) Pub Date : 2021-02-07 Li Zhu, Zhilei Wang, Xuhai Pan, Xinxin Guo, Min Hua, Juncheng Jiang
Abstract With the modernization of urban development, land resources are becoming increasingly scarce. A new type of building model comprising an underground depot and a superstructure has been constructed. To study the hybrid ventilation (HV) in interlayer of the underground depot with a superstructure under monorail line section fire, full-scale numerical simulation and reduced-scale (1:50) experiment
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Experimental and simulation studies on hybrid ventilation in interlayer of underground depot with superstructure Int. J. Vent. (IF 1.5) Pub Date : 2021-02-07 Li Zhu, Zhilei Wang, Xuhai Pan, Xinxin Guo, Min Hua, Juncheng Jiang
Abstract With the modernization of urban development, land resources are becoming increasingly scarce. A new type of building model comprising an underground depot and a superstructure has been constructed. To study the hybrid ventilation (HV) in interlayer of the underground depot with a superstructure under monorail line section fire, full-scale numerical simulation and reduced-scale (1:50) experiment
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Artificial neural network (ANN) for prediction indoor airborne particle concentration Int. J. Vent. (IF 1.5) Pub Date : 2021-02-01 Athmane Gheziel, Salah Hanini, Brahim Mohamedi
Abstract Due to experimental data insufficiency for results validation realized by Computation Fluid Dynamics method (CFD), we are proposed new numerical simulations to determined concentration distribution of fine particles in indoor air for transient regime. The ANN model approach of multi-layer perceptron type with three layers is applied successfully. This model requires learning through a database
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Artificial neural network (ANN) for prediction indoor airborne particle concentration Int. J. Vent. (IF 1.5) Pub Date : 2021-02-01 Athmane Gheziel, Salah Hanini, Brahim Mohamedi
Abstract Due to experimental data insufficiency for results validation realized by Computation Fluid Dynamics method (CFD), we are proposed new numerical simulations to determined concentration distribution of fine particles in indoor air for transient regime. The ANN model approach of multi-layer perceptron type with three layers is applied successfully. This model requires learning through a database
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Experimental investigation of difference in indoor environment using impinging jet ventilation and displacement ventilation systems Int. J. Vent. (IF 1.5) Pub Date : 2021-01-27 Haruna Yamasawa, Tomohiro Kobayashi, Toshio Yamanaka, Narae Choi, Mako Matsuzaki
Abstract The impinging jet ventilation (IJV) system has been proposed as a new air distribution strategy and is expected to overcome the disadvantages of mixing ventilation (MV) system, which is the most widely used system, and displacement ventilation (DV), which provides better air quality than MV. The aim of this study is to accumulate the fundamental feature of IJV and to propose a simple method
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Effect of air supply mode on airflow distribution in winter train sleeper compartments Int. J. Vent. (IF 1.5) Pub Date : 2020-12-22 Liying Sun, Yifan Jiang
Abstract Few of existing literatures on the airflow distribution of compartments have studied combined applications of radiant heating and air conditioning in winter. Simulation of airflow distribution in 25 T soft sleeper compartments under different heating and ventilation schemes is provided in this paper. Firstly, reliability of the numerical simulation model has been verified by the experimental
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Measurement of smoke generation rate using a full-scale hot smoke test for building smoke exhaust systems Int. J. Vent. (IF 1.5) Pub Date : 2020-12-07 ChungHwei Su, ShiuanCheng Wang, YaoHan Chen, CheYi Wu
Abstract In some countries, test standards have been adopted which measure the effectiveness of smoke exhaust systems in clearing out heat and smoke produced separately. However, because these standards provide no quantitative provisions for dealing with the amount of visual smoke, there is an unclear correlation between the amount of smoke generated and the fire load. This paper applied the homogeneity
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The development of an organic air cleaner (OAC) to reduce CO2 level of air-conditioned rooms without fresh air supply Int. J. Vent. (IF 1.5) Pub Date : 2020-11-18 Agustinus Djoko Istiadji, Prasasto Satwiko, Yohanes P. Suhodo, Nimas Sekarlangit, Ade Prasetya, Israni Silvia
Abstract This paper reports on the development of an organic air cleaner (OAC), an interior architectural element that optimises plants’ CO2 absorption in nonventilated air-conditioned rooms. Sansevieria trifasciata, Dracaena sanderiana, Scindapsus aureus and Syngonium podophyllum were explored. Two methods were adopted: the plants’ CO2 uptake was measured, and the results were used for the computer
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Comparison of the effects of symmetric and asymmetric heat load on indoor air quality and local thermal discomfort with diffuse ceiling ventilation Int. J. Vent. (IF 1.5) Pub Date : 2020-11-03 Weixin Zhao, Sami Lestinen, Simo Kilpeläinen, Risto Kosonen
Abstract In this study, indoor air quality and thermal conditions were studied under laboratory conditions with the heat load that was located symmetrically or asymmetrically in the room. Diffuse ceiling ventilation (DCV) was adopted to provide cooling and outdoor air to the room. CO2 concentration, room air temperature and air speed were measured in the test chamber. This study gives insight of both
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Effect of air change rate on particle dispersion from inlet opening under varying particle source strengths Int. J. Vent. (IF 1.5) Pub Date : 2020-09-23 Yunus Emre Cetin, Mete Avci, Orhan Aydin
Abstract In this study, effect of air change rate (air change per hour – ACH) on indoor particle dispersion and deposition in a ventilated room is investigated. A reduced-scale model is designed to conduct experiments. Numerical predictions are performed by using the commercial software ANSYS Fluent 16.0. Four different values of the air change rate (1.73, 2.88, 5.76 and 7.68) and five different values
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Computational study and experimental validation on the effect of inlet hole surface on airflow characteristics and thermal comfort in a box occupied by a thermal manikin Int. J. Vent. (IF 1.5) Pub Date : 2020-09-17 Hasna Abid, Zied Driss
Abstract In an indoor environment, many factors may affect the airflow characteristics and thermal comfort. Hence, a lot of research has been carried out in order to investigate the impact of these factors. The purpose of this study is to determine the effect of supply area, with maintaining the same supply airflow rate, on the airflow characteristics and the indoor thermal comfort for a ventilated