-
Effect of air supply mode on airflow distribution in winter train sleeper compartments Int. J. Vent. (IF 0.732) 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
-
Measurement of smoke generation rate using a full-scale hot smoke test for building smoke exhaust systems Int. J. Vent. (IF 0.732) 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
-
The development of an organic air cleaner (OAC) to reduce CO2 level of air-conditioned rooms without fresh air supply Int. J. Vent. (IF 0.732) 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
-
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 0.732) 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
-
Effect of air change rate on particle dispersion from inlet opening under varying particle source strengths Int. J. Vent. (IF 0.732) Pub Date : 2020-09-23 Yunus Emre Cetin; Mete Avci; Orhan Aydin
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 of the
-
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 0.732) Pub Date : 2020-09-17 Hasna Abid; Zied Driss
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 box prototype
-
Study on emergency ventilation mode for multisource fires in a typical interchange subway station Int. J. Vent. (IF 0.732) Pub Date : 2020-09-15 Jipeng Wang; Yan Wang; Fan Wu; Peihong Wu; Juncheng Jiang
The fire protection design in a large-scale interchange station is always a great challenge. In this paper, a series of numerical simulations were conducted to investigate the performance of emergency ventilation modes for three potential multisource fire scenarios. The parameters that influence passengers’ evacuation were analyzed. The results demonstrated that unreasonable co-operation ventilation
-
Tracing indoor contaminant release location based on local mean residual-life-time of air Int. J. Vent. (IF 0.732) Pub Date : 2020-09-11 Dong Yoon Park; Seongju Chang
Even in case ventilation system is operating in optimal fashion, indoor air quality could be varied depending on the indoor contaminant release occasions. Thus, accurate and rapid identification of contaminant source locations in indoor environment is critical for occupants’ health as well as building safety and integrity. This study presented a novel method to locate indoor contaminant source using
-
The impact of a DCV-system on the IAQ, energy use, and moisture safety in apartments - a case study Int. J. Vent. (IF 0.732) Pub Date : 2020-09-09 Akram Abdul Hamid; Dennis Johansson; Åsa Wahlström; Victor Fransson
A novel DCV-system controls the air-change rate for each apartment in multifamily buildings based on two indoor air parameters: 1) the moisture load (supply), and 2) volatile organic compounds. With a central fan, but decentralized control boxes placed outside each apartment, the system controls the air-change rate for each apartment. This paper’s main aim is to determine the potential of this DCV-system
-
Indoor air quality investigation in a ventilated demonstrator building via a smart sensor Int. J. Vent. (IF 0.732) Pub Date : 2020-07-20 Loubna Qabbal; Zohir Younsi; Hassane Naji
This study deals with the indoor air quality (IAQ) measured and perceived in a demonstration building via a smart sensor. The analysis subject targeted includes the following main air pollutants, viz., CO2, VOCs, formaldehyde, benzene, CO, PM2.5, and comfort parameters such as air temperature, and relative humidity. These were recorded during three campaigns. It turned out that the CO2 level was higher
-
The contribution of a solar air heater collector to the cooling load in a building Int. J. Vent. (IF 0.732) Pub Date : 2020-07-06 Pavlos Toumpoulidis; Argiro Dimoudi; Panos Kosmopoulos; Stamatis Zoras
Over the last few decades, there is a clear target for reducingenergy needs in the building sector. The above objective can be achieved both by renovating the existing building stock and/or by constructing new buildings that will meet the characteristics of zero or nearly zero energy buildings. In order to construct or renovate a building into a zero or almost zero energy building, different passive
-
Dynamic performance of displacement ventilation in a lecture hall Int. J. Vent. (IF 0.732) Pub Date : 2020-07-06 Natalia Lastovets; Kai Sirén; Risto Kosonen; Juha Jokisalo; Simo Kilpeläinen
An accurate temperature gradient calculation is essential for displacement ventilation (DV) system design since it directly relates to thecalculation of the required supply airflow rate. Inaccurate temperature prediction can cause poor thermal comfort and wrong sizing of the ventilation and cooling systems. A heat balance-based method is usually applied in displacement ventilation (DV) design when
-
CO2-concentration of the surrounding air of sleeping infants inside a crib Int. J. Vent. (IF 0.732) Pub Date : 2020-07-01 Gert-Jan Braun; Wim Zeiler
Abstract The indoor air quality is important for the well-being of humans, especially in the case of young babies. This research focuses on the air qualityinside a crib with sleeping infants. The effects of different sleeping positions of the baby on the air quality within the crib were studied by measurements on modelled setup. The breathing of an infant was simulated by means of a baby doll which
-
Performance of an advanced heat recovery ventilation system in the Canadian Arctic Int. J. Vent. (IF 0.732) Pub Date : 2020-06-30 Justin Berquist; Carsen Banister; Dennis Krys
A demonstration house was previously built and commissioned in Iqaluit, Nunavut, Canada. The purpose of the overall effort is to develop and integrate technologies and evaluate the performance of a high-performance building located in the Canadian Arctic, while considering the unique social, economic, and logistical challenges associated with its remote location. Previous work consisted of monitoring
-
Airtightness and energy impact of air infiltration in residential buildings in Spain Int. J. Vent. (IF 0.732) Pub Date : 2020-06-30 Irene Poza-Casado; Alberto Meiss; Miguel Ángel Padilla-Marcos; Jesús Feijó-Muñoz
Addressing the airtightness of the building envelope is key to achieve thermal comfort, good performance ofventilation systems and to avoid excessive energy consumption. Previous studies have estimated an energy impact of infiltration on the heating demand between 2 and 20 kW h/(m2 y) in regions with temperate climates. In Spain, this issue has not yet been addressed in depth. This study aims to assess
-
Quantification of uncertainty in zero-flow pressure approximation Int. J. Vent. (IF 0.732) Pub Date : 2020-06-30 Martin Prignon; Arnaud Dawans; Geoffrey van Moeseke
Multiple authors stated that, when performing fan pressurization test, Ordinary Least Square (OLS) method should not be used as a regression technique anymore. However, alternative methods require first to quantify components of uncertainty in pressure and air flow rate measurements. This work aims at quantifying the uncertainty in zero-flow pressure approximation, which is mainly due to short-term
-
An investigation of ventilation control strategies for louver windows in different climate zones Int. J. Vent. (IF 0.732) Pub Date : 2020-06-30 Leonie Scheuring; Bernhard Weller
Guaranteeing high indoor air quality and high degree of usersatisfaction at the same time is one of the challenges when improving the energy efficiency, namely the energy consumption, of a building. Current non-residential buildings mainly use mechanical ventilation systems to ensure high air quality. Natural ventilation can be an alternative regarding to lower maintenance costs and the psychological
-
Experimental study of the combination of a positive input ventilation and active air vents on the air change rates of a house Int. J. Vent. (IF 0.732) Pub Date : 2020-06-30 Antoine Leconte; Clément Lafféter; Thomas Fritsch; Nicolas Giordano; Julien Escaich; Ophélie Ouvrier-Bonnaz
This study aims to experimentally evaluate the influence of the combination of a supply only ventilation, called here positive input ventilation, and innovative active air vents on the Indoor Air Quality of a house. The positive input ventilation draws fresh air from the outside, filters and pre-heats it before supplying it to living areas. Active air vents are small motorised dampers set up in the
-
Modeling dynamic behavior of volatile organic compounds in a zero energy building Int. J. Vent. (IF 0.732) Pub Date : 2020-06-30 Klaas De Jonge; Jelle Laverge
With increasing building airtightness, the design of an adequate ventilation system gains importance. The first generation of ventilation systems, based on continuous supply of the nominal airflow rate, are now being replaced by demand controlled ventilation (DCV). These systems, often H2O and/or CO2 controlled, typically do not take into account the emissions of volatile organic compounds (VOCs) to
-
A structured approach to the evaluation of indoor environments’ecological valency Int. J. Vent. (IF 0.732) Pub Date : 2020-06-19 Ardeshir Mahdavi; Helene Teufl; Christiane Berger
Abstract Buildings typically are expected to provide their inhabitants with the opportunity to influence the indoor environment using various control devices. These include, for example, windows, luminaires, radiators, and shading elements. The quality and adequacy of the indoor environment is thus dependent on the availability and effectiveness of such devices. There is arguably a lack of generally
-
Developing a new passive tracer gas test for air change rate measurement Int. J. Vent. (IF 0.732) Pub Date : 2020-06-17 Sarah L. Paralovo; Maarten Spruyt; Joris Lauwers; Rudi Swinnen; Borislav Lazarov; Marianne Stranger; Jelle Laverge
Ventilation is critical in interpreting indoor air quality (IAQ), yet most IAQ assessments do not report ventilation adequately. Most ventilation assessments use tracer gas tests (TGT) to measure total air change rate (ACH), but currently applied TGTs present three shortcomings: limited comparability between ACH and IAQ data, inadequate substances employed as tracer gases and tendency to bias arising
-
Multi-objective design of single room ventilation units with heat and water recovery Int. J. Vent. (IF 0.732) Pub Date : 2020-06-12 Antoine Parthoens; Luc Prieels; Jean-Jacques Embrechts; Yves Detandt; Sébastien Pecceu; Samuel Gendebien; Vincent Lemort
The present paper describes the design improvement of a single-room ventilation unit. This ventilation system presents many advantages, however, several drawbacks exist. The first one is the acoustic disturbance. As the facilities are directly installed within the rooms, the fans’ noise may create discomfort. Furthermore, in the cold or temperate climates, condensation or frost may appear. A dedicated
-
Fire smoke movement and distribution in ventilation shafts Int. J. Vent. (IF 0.732) Pub Date : 2020-06-12 Yanqiu Chen; Xiankun Wang; Peng Wang; Man Yuan
Vertical shafts are common structures in buildings, which accelerate smoke spread in fires due to stack effect. In this study, fire smoke movement and distribution in a ventilation shaft were studied through analysing temperature distributions, velocity distributions, CO2 concentration distributions and pressure distributions. Four exhaust rates were discussed and compared. It was found that the status
-
Effects of air inlet or outlet position of a fan coil unit ventilation system on smoke movement and fire severity Int. J. Vent. (IF 0.732) Pub Date : 2020-05-07 Teng-Yi Wang; Kuang-Chung Tsai
Air conditioning engineers design the inlet or outlet position of a fan coil unit (FCU) system according to thermal comfort and cost. However, the effect of the position on fire growth has not been considered. In this study, the effect of the relative inlet and outlet positions was investigated. Thirty cases were simulated using fire dynamics simulator (FDS). The simulation results revealed that the
-
Ventilation in low energy residences – a survey on code requirements, implementation barriers and operational challenges from seven European countries Int. J. Vent. (IF 0.732) Pub Date : 2020-03-19 Daria Zukowska; Gabriel Rojas; Esfand Burman; Gaelle Guyot; Maria del Carmen Bocanegra-Yanez; Jelle Laverge; Guangyu Cao; Jakub Kolarik
This paper reports the results of an interview survey conducted among different stakeholders involved in design, installation and operation of residential ventilation in seven European countries. In total 44 interviews were performed. The results provide a valuable snapshot of current practices and insights into potential barriers and challenges regarding installation of mechanical ventilation in low-energy
-
3D simulations of smoke exhaust system in two types of subway station platforms Int. J. Vent. (IF 0.732) Pub Date : 2020-01-26 Zahra Tavakolian; Omid Abouali; Mahmoud Yaghoubi
In this study, smoke evacuation in two kinds of subway station platform models, namely: an island platform station and a two side platforms station is simulated in a three-dimensional configuration. FDS 6.1.1 (Fire Dynamic Simulator) software has been employed to perform numerical simulations. The results showed noticeable effects of platform architecture on the process of smoke evacuation and emission
-
Experimental study on influence of personnel activity and surgical smoke on indoor environment inside clean operating room Int. J. Vent. (IF 0.732) Pub Date : 2020-01-16 Jianjie Cheng; Xiaoyi Niu; Rui Zhang; Xidong Zhu; Song Lu; Bin Zhou; Xianting Li
With the wide application of electronic surgical equipment, the generation of surgical smoke is inevitable. Surgical smoke will not only obstruct the operator's visibility, but also release toxic and harmful substances into the air, which will make the operator a headache and cause inflammation of the eyes and mucous membranes. In order to evaluate whether the existing operating room ventilation system
-
Design and analysis of a novel solar hybrid air conditioning-ventilation-HDH desalination system Int. J. Vent. (IF 0.732) Pub Date : 2019-12-17 Wallada Mbarek; Rached Nciri; Faouzi Nasri; Chaouki Ali; Habib Ben Bacha
This paper proposes an original and sustainable design for a Hybrid solar Air Conditioning-Ventilation-Humidification-Dehumidification (HDH) desalination system. The proposed design permits to produce both thermal comfort and desalinated water for residential buildings. The originality of the system design as well as its operating principle is described in detail. Mathematical models, that govern the
-
Computer simulation of airflows generated by jet fans in real road tunnel by parallel version of FDS 6 Int. J. Vent. (IF 0.732) Pub Date : 2019-12-11 Peter Weisenpacher; Lukas Valasek
In this paper the FDS 6 code ability to simulate the airflows generated by jet fans in a real road tunnel is studied. A transient model of the 898 m long bi-directional highway Polana tunnel is created including details of the tunnel geometry as emergency lay-bys and traffic signs. The absolute roughness of the tunnel walls of 70 mm is determined to represent the influence of curved tunnel geometry
-
Reduced-scale study of the coupling between thermal and wind effects on the ventilation systems of nuclear facilities Int. J. Vent. (IF 0.732) Pub Date : 2019-11-24 Thomas Le Dez; Jérôme Richard; Christian Inard; Nicolas Le Roux; François Demouge; Xavier Faure; Laurent Ricciardi
To study heat and mass transfers inside nuclear facilities equipped with ventilation systems, a methodology was developed to carry out reduced-scale experiments for studying flows induced by thermal and wind effects simultaneously. The methodology was numerically validated on simple configurations and applied to a reference configuration representative of nuclear facilities. The effects of wind and
-
Numerical simulation of hybrid ventilation for underground subway depot with superstructures Int. J. Vent. (IF 0.732) Pub Date : 2019-11-14 Zhilei Wang; Xinxin Guo; Xuhai Pan; Li Zhu; Juan Yang; Min Hua; Juncheng Jiang
This study proposed a hybrid ventilation mode for underground subway depot with superstructures and described the construction of a calculation model for estimating the smoke-exhaust efficiency of ventilation systems in such buildings. The hybrid ventilation system consisted of natural ventilation, a flow deflector, and mechanical fans. The smoke-layer height, smoke temperature, gas-flow routes, and
-
A grid convergence index study of mesh style effect on the accuracy of the numerical results for an indoor airflow profile Int. J. Vent. (IF 0.732) Pub Date : 2019-09-24 Nazar Baker; Ger Kelly; Paul D. O'Sullivan
The Grid Convergence Index ( GCI) method requires at least three systematic mesh refinements, each requiring the numerical solution to be in the asymptotic range. When the observed order of accuracy differs from the formal order of accuracy, a lack of numerical precision exists which may result in erroneous conclusions. The aim of the work in this paper is to evaluate the effect the mesh resolution
-
Impact of window parameters on the building envelope on the thermal comfort, energy consumption and cost and environment Int. J. Vent. (IF 0.732) Pub Date : 2019-09-19 Rania Elghamry; Hamdy Hassan
In this paper, the impact of window parameters (shape, design, sizes, position and orientation) on the building thermal comfort (temperature, relative humidity and discomfort period), energy consumption (lighting loads, heating and cooling loads and total energy consumption) and cost, and environment effect (CO2 emissions) is analysed under hot semi-arid climate conditions. This study considers the
-
Investigation of the impact of roof configurations on the wind and thermal environment in football stadiums in hot climates Int. J. Vent. (IF 0.732) Pub Date : 2019-09-16 Sam Bonser; Ben Richard Hughes; John Kaiser Calautit
The present study provides an analysis of existing literature encompassing the wind and thermal analysis of football stadia, and how both can be manipulated through the modification of roof geometry. It introduces the potential for cooling strategies to create an internal environment capable of hosting elite-level international football in a hot climate. The motivation for the study stems from an absence
-
How loud is too loud? noise from domestic mechanical ventilation systems Int. J. Vent. (IF 0.732) Pub Date : 2019-06-12 Jack Harvie-Clark, Nick Conlan, Weigang Wei, Mark Siddall
Noise from domestic ventilation systems is currently a little understood problem in the UK. Other European countries that have a longer history of using mechanical domestic ventilation systems have introduced noise limits for these systems. Without mandatory limits for noise in UK, noise is not a factor that is often considered during the design. However, noise can be a significant constraint to the
-
Correction Int. J. Vent. (IF 0.732) Pub Date : 2019-02-13
(2018). Correction. International Journal of Ventilation: Vol. 17, No. 4, pp. II-II.
-
Theoretical analysis of natural displacement ventilation in a warm space Int. J. Vent. (IF 0.732) Pub Date : 2018-11-14 Xiufeng Yang, Limei Xia, Xing Chen, Yanming Kang, Ke Zhong
The transient development of natural displacement ventilation in a warm space with a localized source of heat is investigated theoretically to understand the fluid mechanics in detail. One of four flow modes, A, B, C and D, may develop during the transient evolution. The flow pattern of mode B, C or D can be further subdivided into two cases respectively according to a critical value of the reduced
-
Demand control ventilation with hygro passive sensors: impact of sensor’s characteristics Int. J. Vent. (IF 0.732) Pub Date : 2018-10-31 Xavier Faure, Ophelie Ouvrier-Bonnaz
Following the increasing energy performances of building, ventilation systems are being considered as key actors in reaching both energy and indoor air quality targets. Despite several pollutants that can be used as airflow modulation inputs, French demand control ventilation for dwellings, is mainly realized using water vapour and passive sensors. A variable opening section is modulated through the
-
Buoyancy-driven natural ventilation in one storey connected with an atrium Int. J. Vent. (IF 0.732) Pub Date : 2018-10-29 Jian Gong, Jian Hang
A macroscopic zone model is used to analyze buoyancy-driven natural ventilation in one storey connected with an atrium. The height ratio between the storey and atrium can be variable as well as the heat ratio between the two heat sources, one in storey and the other in atrium. Both the steady-state and time-dependent flow rate through the storey and atrium are investigated. The transient process from
-
In situ investigation on linkage between particle penetration and air exchange through building envelope Int. J. Vent. (IF 0.732) Pub Date : 2018-05-10 Xinke Wang, Zhao Gao, Jingxin Yang, Xiaoxue Yang
In the paper, study on quantitative analysis between particle penetration and air change was made. In situ experiments in a practical office room were carried out. Through recording concentration of indoor and outdoor CO2 and PM2.5, particle penetration coefficients (Fp) corresponding to different air change rate (ACH) were obtained by fitting method. The uncertainty analysis by Monte-Carlo method
-
Study of infiltration through sliding windows with respect to closing mechanisms and their locations in a building during winter season Int. J. Vent. (IF 0.732) Pub Date : 2018-04-27 Jong Jun Park, Young Il Kim
Infiltration through windows accounts for a significant heat loss in buildings during winter, leading to the need to minimize uncontrolled air flow. Improvement of window air tightness is important for reducing heat loss by infiltration through windows. In this study, infiltration is measured for general sliding (GS), parallel sliding tilt (PST) and lift sliding (LS) windows according to ASTM E283
-
Mapping tracer gas concentrations using a modified Low Third Derivative method: numerical study Int. J. Vent. (IF 0.732) Pub Date : 2018-04-18 M. Cehlin
In indoor applications, computed tomography is the process of transforming a network of intersecting attenuation measurements into a spatially resolved two-dimensional concentration map. In this study the Low Third Derivative method (LTD) was numerically evaluated and optimized for different conditions. A modified version of the LTD algorithm (LTDm) was proposed and evaluated against the original version
-
Analysis of induced interior air flow in subway train cabin due to accelerating and decelerating Int. J. Vent. (IF 0.732) Pub Date : 2018-04-18 Mohammad Reza Talaee, Ali Kabiri, Mohammad Ebrahimi, Behtash Hakimzadeh
Due to the importance of air-conditioning system in public transport vehicles, some researches focused on improving the efficiency of Air Conditioning (AC) systems, especially in urban and high speed trains. This study investigates the induced airflow in long corridor of metro train in accelerating and decelerating modes, analytically and experimentally. The simplified governing equation of Navier-Stokes
-
Erratum Int. J. Vent. (IF 0.732) Pub Date : 2018-03-20
(2018). Erratum. International Journal of Ventilation: Vol. 17, No. 4, pp. I-I.
-
Numerical robustness analysis of natural and mechanical smoke extraction systems for buildings Int. J. Vent. (IF 0.732) Pub Date : 2018-03-13 Mark Wesseling, Martin Schmidt, Dirk Müller
Buildings’ smoke extraction systems are commonly designed according to guidelines and standards. This approach does not take all boundary conditions into account that may occur within the lifespan of a building. We introduce a novel approach for evaluating the robustness of smoke extraction systems that incorporates realistic boundary conditions by means of the Monte Carlo CFD simulation method. We
-
Performance based approaches in standards and regulations for smart ventilation in residential buildings: a summary review Int. J. Vent. (IF 0.732) Pub Date : 2018-03-13 Gaëlle Guyot, Iain S. Walker, Max H. Sherman
As ventilation systems become more sophisticated (or ‘smart’) standards and regulations are changing to accommodate their use. A key smart ventilation concept is to use controls to ventilate more at times it provides either an energy or IAQ advantage (or both) and less when it provides a disadvantage. This paper discusses the favorable contexts that exist in many countries, with regulations and standards
-
Experimental investigation of air distribution and ventilation efficiency in an ice rink arena Int. J. Vent. (IF 0.732) Pub Date : 2018-03-06 Sander Toomla, Sami Lestinen, Simo Kilpeläinen, Lauri Leppä, Risto Kosonen, Jarek Kurnitski
This study presents extensive experimental measurements in a modern Finnish ice rink arena including temperature, relative humidity, carbon dioxide, air speed, air flow and pressure difference measurements in addition to smoke tests. Furthermore, the air exchange rate (ACH), air-exchange efficiency, and mixing factor were calculated. The main aim was to determine ventilation effectiveness, vertical
-
VOC emission rates in newly built and renovated buildings, and the influence of ventilation – a review and meta-analysis Int. J. Vent. (IF 0.732) Pub Date : 2018-02-20 Sverre B. Holøs, Aileen Yang, Merethe Lind, Kari Thunshelle, Peter Schild, Mads Mysen
Few field studies have evaluated ventilation strategies, such as temporarily increasing the ventilation rate, to counter the high pollutant-load from off-gassing of volatile compounds from new materials in these buildings. We reviewed longitudinal studies that measured both ventilation rate (i.e. fresh air change rate) and airborne concentration of total volatile organic compounds (TVOC). Rates of
-
A wind tunnel study of wind-driven airing through open doors Int. J. Vent. (IF 0.732) Pub Date : 2018-02-15 Abolfazl Hayati, Magnus Mattsson, Mats Sandberg
Temporarily enhanced natural ventilation of indoor environments can be achieved by opening windows and/or doors, i.e. airing. In this study, wind driven airing rate through doors was measured by tracer gas at a building model in a wind tunnel. Both single opening and cross flow airing was investigated, with doors placed in centrally on the long side of an elongated building model. It was found that
-
Airflow and heat stress in a metallurgical industrial building under different working conditions Int. J. Vent. (IF 0.732) Pub Date : 2018-02-12 Ruijie Zhao, Louis Gosselin, Jayson Tessier, Mario Fafard
Potrooms are elongated buildings in which hundreds of aluminum smelting pots are housed, and have the particularity, among others, to be naturally ventilated. A CFD model simulating a potroom is developed to study its thermal comfort when the aluminum smelting pots take in less volume of air so as to facilitate waste heat recovery from the pot draft. The influences of wind and buoyancy on the ventilation
-
Computational of the wind velocity effect on infiltration rates in an individual building using multi-zone airflow model Int. J. Vent. (IF 0.732) Pub Date : 2018-02-09 Lounes Koufi, Zohir Younsi, Hassane Naji
This paper presents and discusses numerical simulation of the wind velocity's effect on infiltration rates in an individual building using multi-zone modelling. The governing equations are expressed in terms of unknown pressures at points where flow paths connect. Their implementation was achieved using an advanced numerical model, which was developed via the MATLAB environment. Such a numerical approach
-
Effects of ceiling induction diffusers on indoor environmental quality of sickroom under the cooling air supply condition Int. J. Vent. (IF 0.732) Pub Date : 2018-02-08 Ying Li, Toshio Yamanaka, Hisashi Kotani, Kazunobu Sagara, Yoshihisa Momoi, Mari Kuranaga
A series of experiments were carried out in a full-scaled model room to verify the characteristics of the air-conditioning system with ceiling induction diffusers. By the step-up tracer gas method and decay method, 10 cases with three varying parameters (the positions of exhausts, the heights of the exhaust ports and the states of the curtains around the beds) were designed to examine the influence
-
The influence on surface condensation risk of lower ventilation rates: the case of the proposal of indoor air quality requirement for the Spanish regulations Int. J. Vent. (IF 0.732) Pub Date : 2018-02-07 Pilar Linares, Sonia García-Ortega, Enrique Larrumbide
As a result of recent research at the Eduardo Torroja Institute for construction sciences, a new wording for the indoor air quality (IAQ) regulations for dwellings included in the Spanish Building Code has come into force with the main goal of adapting required ventilation rates to real needs to consequently achieve a reduction of energy demand with no negative impact on indoor air quality or on condensation
-
Ventilation requirements based on carbon dioxide concentration criteria: implications on IAQ and energy use Int. J. Vent. (IF 0.732) Pub Date : 2018-02-02 Moises Odriozola-Maritorena, Koldobika Martin, Iván Flores, Álvaro Campos-Celador, José María Sala
Minimum airflow rates are either recommended or required based on the number of occupants, the intended use of the space or the floor plan area. This paper focuses on a new proposal for Spanish Technical Building Code based on limitations of the ventilation using the CO2 concentration as an indicator. The aim of the proposal is to introduce indoor air quality criteria in order to determine the design
-
A strategy for the partition of MRF zones in axial fan simulation Int. J. Vent. (IF 0.732) Pub Date : 2018-01-31 Wei Peng, Guoxiang Li, Jie Geng, Wei Yan
In axial fan simulation using multiple reference frame (MRF) method, an inappropriate size of rotating zone may affect the accuracy of results. In order to study the influence of axial and radial sizes in a wide flow rate range, five rotating zone sizes were investigated at seven flow rate points from 0 to 11.3 m3/s in a simplified fan setup configuration. Comparing the fan characteristic curves, it
-
An iterative correction method for the input fan curve in an actuator disk model Int. J. Vent. (IF 0.732) Pub Date : 2017-12-29 Wei Peng, Guoxiang Li, Jie Geng, Wei Yan
The 3D fan zone model is a recently developed variant of the actuator disk models, based on an input fan curve to simulate the fan effect. However, the fan curves are typically obtained in experimental situations under common standards, which could be different from the operating scenario in simulation, specifically, the definitions of flowrate and the fan appurtenances effect. In order to adapt the
-
Practical aspects of jet fan ventilation systems modelling in fire dynamics simulator code Int. J. Vent. (IF 0.732) Pub Date : 2017-11-15 Dorota Brzezińska
Good air quality is one of the main requirements of human health. Jet fan ventilators are often applied for pollutant removal in large enclosures, where lack of fresh air is significant. During the design phase, computational fluid dynamic (CFD) techniques are most often used to verify the effectiveness of ventilation. However, reliable designs based on CFD, require accurate jet fan airstream modelling
-
Capturing the needs of architects: a survey of their current information requirements for natural ventilation design Int. J. Vent. (IF 0.732) Pub Date : 2017-11-01 Recha Baeumle, Gary R. Hunt
This paper focusses on identifying the information needs of modern-day architects seeking to design low-energy naturally ventilated buildings. We present the results of a survey conveying the personal views of international MA/MSc/MArch student architects at the Architectural Association School of Architecture, London, UK. The aim was to gain insight and raise awareness of architects’ current information
-
Investigation of the number of particles in an operating room at different ambient temperatures and inlet velocities Int. J. Vent. (IF 0.732) Pub Date : 2017-10-30 H. Ufat, O. Kaynakli, N. Yamankaradeniz, R. Yamankaradeniz
This study presents some field measurements in an operating room of air velocity, ambient temperature and particle counts on the operating table. Moreover, computational fluid Dynamics analyses of the operating room were performed and compared with the measurements. Measurements were taken under the preferred operating conditions by surgical staff (at 19 °C) and then at different ambient temperatures
-
Experimental study of the transverse diffusion of pollutants through a downward plane jet in a room Int. J. Vent. (IF 0.732) Pub Date : 2017-10-26 Guangyu Cao, Simo Kilpeläinen, Kai Sirén
Recently, a new type of ventilation method known as protected zone ventilation has been studied for application to the prevention of indoor contaminants transported from one zone to another. The use of a downward plane jet plays a key role in a protected zone ventilation system. The objective of this study is to examine the transmission of contaminants through a downward plane jet in a room with gaseous
Contents have been reproduced by permission of the publishers.