scholarly journals Influence of local exhaust ventilation parameters on the quality of the room’s air environment

2020 ◽  
Vol 175 ◽  
pp. 11020
Author(s):  
Alexey Shashin ◽  
Roman Sheps ◽  
Dmitry Lobanov ◽  
Alexander Mershiev
Keyword(s):  
Air Quality ◽  
Experimental Studies ◽  
Source Surface ◽  
Air Velocity ◽  
Surface Source ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Mass Transfer Processes ◽  
Harmful Emissions

The article considers the influence of local exhaust ventilation parameters on the quality of the room’s air environment. On the basis of experimental studies, dependencies were established that determine the effect of mass transfer processes occurring in the local exhaust ventilation shelter on air quality in a room working area. The influence of a flat plate installed in the lower part of technological opening of a shelter that prevents incoming air movement from a room to a source surface of convective jet is determined. This measure made it possible to reduce the air velocity above surface source and the amount of harmful emissions by 2.5 times, as well as to reduce their flow into a room through an opening a shelter. These measures allow to reduce energy costs for room ventilation and improve air quality in the serviced room.

scholarly journals Simulation and Analysis of Various Ventilation Systems Given in an Example in the Same School of Indoor Air Quality

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2845 ◽  
Author(s):  
Katarzyna Gładyszewska-Fiedoruk ◽  
Vasyl Zhelykh ◽  
Andrii Pushchinskyi
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Carbon Dioxide Concentration ◽  
Additional Energy ◽  
Exhaust Ventilation ◽  
Building Ventilation ◽  
The Cost

The quality of internal air is one of the factors that affect the pace and quality of knowledge acquisition. Therefore, it is important that classrooms have high quality of air. Using computer simulation, the effect of various building ventilation variants on air quality in classrooms was analyzed. Two criteria were analyzed and six variants of ventilation. The analysis was carried out using the CONTAMW program, used for multi-zone analysis of ventilation and air quality in a building. As an indicator of air quality, the concentration of carbon dioxide in school halls was adopted. The analyses show that natural ventilation is not able to provide proper air exchange. Regular airing of classrooms during breaks can reduce the carbon dioxide concentration to 2500 ppm, however, there is a significant reduction in indoor temperature (even below 10 °C). The best control over the internal environment can be obtained by using a supply–exhaust ventilation system with heat recovery. Obtaining a higher stabilization of ventilation is achieved by supplying additional energy to drive fans, however, this is only a small amount of energy compared to the cost of heat for heating the building (maximum 2%).

scholarly journals Local exhaust ventilation solutions for an industrial hall – Part 1 CFD analysis of the local exhaust systems

2019 ◽  
Vol 85 ◽  
pp. 02012
Author(s):  
George-Mădălin Chitaru ◽  
Mihnea Sandu ◽  
Cristiana Verona Croitoru ◽  
Florin Bode
Keyword(s):  
Ventilation System ◽  
Preliminary Design ◽  
Cfd Analysis ◽  
Ventilation Strategy ◽  
Treatment Facility ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Pollutant Concentrations ◽  
High Ammonia

Industrial hygiene is an important aspect of any workplace environment, especially for the industrial domain. A previous study has shown that high ammonia levels were present in a wastewater treatment facility in Romania. The initial ventilation strategy was not efficient in maintaining pollutant concentrations within standard safety limits. An optimization of the initial ventilation system was realized, but CFD results and on-site measurements have shown that high local concentrations were still present. Two local exhaust methods have been proposed and analysed in order to improve the quality of the air inside the hall. A CFD approach has been used for the preliminary design process. The results indicate that both local exhaust solutions offer great improvements over the general dilution-based system, but only one can be applied.

IMPROVING INDOOR AIR QUALITY USING LOCAL EXHAUST VENTILATION (LEV)

2015 ◽  
Vol 76 (6) ◽  
Author(s):  
Norasikin Binti Hussin ◽  
Dzullijah Binti Ibrahim ◽  
Farrah Noor Binti Ahmad ◽  
Nur Hayati Binti Mohd Yahya ◽  
Siti Mardini Binti Hashim
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Local Exhaust Ventilation ◽  
Healthy Environment ◽  
Exhaust Ventilation ◽  
Hot Environment ◽  
Environmental Criteria ◽  
Level Of Satisfaction ◽  
And Performance

Ventilation is used to control indoor air quality for maintaining the health and performance of human and ensuring healthy environment. It is known that the environmental criteria are dictated by temperature, humidity, and contamination. In a case study at XY company, questionnaires were distributed to the workers and interviews were conducted to find out the level of satisfaction on working conditions in certain areas. 70% respondents reported feeling uncomfortable because of heat, dust and hot environment. An analysis of indoor air quality was carried out to measure the temperature at pouring area. Based on the analysis, the range of temperatures is from 35°C to 43°C. A local exhaust ventilation (LEV) system was design for improve indoor air quality and reduce extreme heat. The LEV system was proposed for the pouring area to capture then discharged heat or contaminants through a series of strategically placed overhead ducts.

scholarly journals KUALITAS UDARA RUANG PERAWATAN PENYAKIT MENULAR DI RUMAH SAKIT PARU SURABAYA TAHUN 2016

2016 ◽  
Vol 14 (3) ◽  
Author(s):  
Imro’atul Mufidah ◽  
Erna Triastuti ◽  
Ernita Sari
Keyword(s):  
Infectious Disease ◽  
Air Quality ◽  
Room Temperature ◽  
Air Velocity ◽  
Disease Treatment ◽  
Maintenance Process ◽  
Construction Condition ◽  
Bacterial Index ◽  
Room Lighting

Infectious disease treatment rooms are places with a high risk of the transmission of diseases and nosocomial infections. Therefore, there is a need for good environmental quality, either in terms of air quality, and room construction condition, cleaning process and number of occupant density.  The study was a descriptive study aimed at describing the air quality of infectious disease treatment rooms in Lung Hospital Surabaya in 2016. Data were collected by means of observations, interviews, measurements and calculation of the airborne bacterial index.  CFU/m3Results showed that the airborne bacterial index of inpatient rooms was 1030 CFU/m and >2628 CFU/m3 for Dahlia Room 1, Dahlia Room 2 and Pear Room, respectively. Room temperature was 29.8°C, 30.5°C and 30.9C for Dahlia Room 1, Dahlia Room 2 and Pear Room, respectively. Room humidity was 69%, 65% and 65% for Dahlia Room 1, Dahlia Room 2 and Pear Room, respectively. Room air velocity was eligible for Dahlia Room 1 and Dahlia Room 2 at 0.49 m/s and 2 0.18 m/s respectively, but It was not so for Pear Room at 0.89 m/s. Room lighting was 62 lux, 26 lux and 81 lux for Dahlia Room 1, Dahlia Room 2 and Pear Room, respectively. In conclusion, the airborne bacterial index, temperature, humidity and lighting in Lung Hospital Surabaya in 2016 did not meet the requirements as defined in Decree of the Minister of Health No. 1204/Menkes/SK/X/2004 on Hospital Environmental Health Requirements.  It iis recommended to improve the cleaning and maintenance process of those rooms in accordance with health procedures and to improve construction of the rooms which do not meet the requirements.  Keywords : Room air quality, Hospital

scholarly journals CFD simulation of local exhaust ventilation for aviation fire-test lab

2018 ◽  
Vol 7 (4.13) ◽  
pp. 188-194
Author(s):  
Aiman S H Al-Ammari ◽  
Yazan S M Altarazi ◽  
Abd. Rahim Abu Talib ◽  
M Nadiir Bheekhun
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Fire Test ◽  
Cfd Simulation ◽  
Ventilation System ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Air Contaminant ◽  
Cfd Method

Excellent indoor air quality in an enclosed area has always become a major safety aspect in designing a building. Issues with regards to circulation of air and exhaust system must be first resolved before the said building can be used for any purposes. The goal of this study is to identify ways to improve air quality in the aviation fire test room at the Propulsion Laboratory that is located in Universiti Putra Malaysia (UPM), Selangor, Malaysia. A computational fluid dynamics (CFD) method was employed to predict the air contaminant inside the lab. When performing the activities, the indoor air quality have to be ensure circulated and ventilated in the lab. Using a mechanical fans and natural ventilation are a traditional method to provide indoor air quality into the propulsion. Whereby, this method may not be enough to provide the required indoor air quality for specific aviation fire-test setup. Such labs may suffer from increasing air contaminant based on the improper and irregular air distribution. A grid independent test (GIT) was done to reduce the effects of meshing on the results was carried out to estimate the discretization error. Computational fluid dynamic (CFD) method was carried out to identify a suitable ventilation system that would result in the greatest improvement in the indoor air quality (IAQ) inside the lab. The results of using the CFD simulation show that installing Local Exhaust Ventilation (LEV) at the lab could significantly improve the IAQ inside the lab. The airflow increase by 84% and the CO, CO2 and NO reduce by 84%, 89 and 81%, respectively. Improvement of the IAQ by increasing the airflow and reducing in the air CO, CO2, and NO, which can be considered as very significant achievement.    

Computer modeling of ventilation when performing electric welding

2020 ◽  
pp. 59-65
Author(s):  
V. V. Shaptala ◽  
K. I. Logachev ◽  
N. N. Severin ◽  
E. E. Khukalenko ◽  
Yu. M. Gusev
Keyword(s):  
Computer Modeling ◽  
Maximum Permissible Concentration ◽  
Ventilation System ◽  
Exchange Effect ◽  
Electric Welding ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Maximum Permissible Concentrations ◽  
Harmful Emissions ◽  
Effective Use

The design of an integrated ventilation system, which combines local exhaust ventilation of welders' workplaces and general ventilation of premises, is considered. Thefields of air mobility, its temperature and concentration of harmful impurities are calculated using the method of computer modeling. A comparative analysis of the main types of stationary devices for local exhaust ventilation of electric welding workstations (exhaust hoods, welding panels, as well as blowers) is performed. The conditions for the effective use of lift-and-turn suction pumps have been determined. The factors influencing the efficiency of their work have been identified, and combinations of influencing factors have been established that ensure the maximum permissible concentration of harmful emissions in the working areas of welders. The conditions under which the general exchange effect of local suction is sufficient to maintain the concentration in the room at the level of maximum permissible concentrations (MPC) have been determined. The results obtained can be used to develop engineering methods for calculating and optimizing ventilation devices and systems, as well as to analyze structural and design solutions for the ventilation device of electric welding industries.

scholarly journals Theoretical and experimental substantiation of the system of local removal of harmful substances during the combustion of candles in the worship hall of Orthodox churches and cathedrals

2021 ◽  
Vol 263 ◽  
pp. 04013
Author(s):  
Alexander Eremkin ◽  
Inna Ponomareva
Keyword(s):  
Thermal Imaging ◽  
Convective Flow ◽  
Ventilation System ◽  
Air Velocity ◽  
Efficient Operation ◽  
Local Exhaust Ventilation ◽  
Convective Flows ◽  
Exhaust Ventilation ◽  
Harmful Substances ◽  
Experimental Substantiation

The analysis of the features of Orthodox churches, temples and cathedrals, elements of the design of the halls of worship, and their preservation. The types of hazards generated during the burning of candles and the parishioners and staff present are systematized. Thermal imaging surveys of convective flows formed during candle combustion were carried out. A technique for conducting experiments and a diagram of an experimental setup for measuring the temperature and air velocity in a convective jet have been developed. The diagram of the convective flow structure is presented, which consists of individual jets from each candle. The results of the study have been obtained, which make it possible to determine the area of stable convective flow and the place of installation of the exhaust hood above the candlestick, as well as the distance between the burning candles and the edge of the bottom of the umbrella. A local mechanical exhaust ventilation system with umbrellas has been developed to trap and remove harmful substances from the worship hall and provide comfortable conditions for parishioners and preserve the decoration elements of the halls. The characteristics and conditions for the efficient operation of the hoods in the local exhaust ventilation system and the factors influencing their operation are given.

scholarly journals DEVICES AND VENTILATION PROCESS DURING EXECUTION ELECTRIC WELDING

2020 ◽  
Vol 5 (9) ◽  
pp. 21-29
Author(s):  
V. Shaptala ◽  
E. Hukalenko ◽  
N. Severin ◽  
Y. Gusev
Keyword(s):  
Maximum Permissible Concentration ◽  
Ventilation System ◽  
Simulation Method ◽  
Exchange Effect ◽  
Factors Affecting ◽  
Electric Welding ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Harmful Emissions ◽  
Effective Use

The main direction of normalizing the parameters of the air during electric welding is proposed to consider the installation of an integrated ventilation system that combines local exhaust ventilation of welder jobs and general ventilation of rooms. In the article using the computer simulation method, the fields of air mobility, its temperature and concentration of harmful impurities are calculated and a comparative analysis of the main types of stationary devices for local exhaust ventilation of electric welding jobs: exhaust umbrellas, welding panels, and suction blowers, as well as the conditions for effective use of rotary suction pumps. Factors affecting the efficiency of their work are identified and combinations of influencing factors that provide the maximum permissible concentration of harmful emissions in the welders' working areas are established. The conditions are determined under which the general exchange effect of local suction is sufficient to maintain indoor concentration at the MPC level. The results obtained can be used to develop engineering methods for calculating and optimizing ventilation devices and systems, as well as to analyze structural and design solutions for ventilation devices in electric welding plants.

scholarly journals LOCAL EXHAUST VENTILATION WITH EJECTION OF EXPLOSIVE SUBSTANCES AND RECIRCULATION OF PURIFIED AIR

2021 ◽  
Vol 6 (2) ◽  
pp. 28-37
Author(s):  
A. Shashin ◽  
R. Sheps ◽  
A. Seminenko ◽  
V. Minko
Keyword(s):  
Gas Flow ◽  
Operation Mode ◽  
Experimental Studies ◽  
Operating Costs ◽  
Local Exhaust Ventilation ◽  
Industrial Enterprises ◽  
Exhaust Ventilation ◽  
Cleaning Device ◽  
Harmful Substances ◽  
Air Exchange

Exhaust ventilation systems in industrial enterprises and facilities with the use of harmful substances largely determine the air exchange in the workplace to ensure normalized sanitary and hygienic conditions and operating costs. Local exhaust ventilation of explosive harmful substances is of particular importance for effective air exchange in such rooms, since their localization, suction and transportation are subject to increased requirements. The paper presents the results of analytical and experimental studies of the operation mode of a complex local exhaust device with a gas ejector for extraction explosive harmful chemicals from shelters, ensuring their effective localization, purification and recirculation of air. The boundary conditions and assumptions for calculating the characteristics of the processes of gas flow ejection, purification of technological emissions and recirculation of the purified gas flow, determined on the basis of the analysis of previously performed studies and experimental work, are given. The conditions of rational ratios device settings of extraction of emissions sources of substances that parameters of the ejector and cleaning device emission, which is achieved economic and environmental efficiency of the installation and excludes the volatile situation on the threat of chemical enterprises and objects.

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