scholarly journals The consequences of the inappropriate use of ventilation systems operating in indoor swimming pool conditions - analysis

2018 ◽  
Vol 45 ◽  
pp. 00064
Author(s):  
Izabela Pietkun-Greber ◽  
Dariusz Suszanowicz
Keyword(s):  
Air Quality ◽  
Ventilation System ◽  
Construction Materials ◽  
Swimming Pool ◽  
Swimming Pools ◽  
Operation And Maintenance ◽  
Chlorine Ions ◽  
Leisure Facilities ◽  
The Given ◽  
Ventilation Systems

Increasingly more leisure facilities, such as water parks or indoor swimming pools are being built in Poland nowadays. In order to ensure the air quality required by standards for such leisure facilities it is necessary to fit them with effectively functioning ventilation. For the removal of excess humidity, as well as chlorine ions occurring as a result of the disinfection of water as well as the carbon dioxide emitted by people using the facility, the ventilation system needs to be appropriately designed and efficient. For this reason, studies into the air quality in such facilities were undertaken. The paper presents the causes and consequences of the inappropriate operation and maintenance of ventilation systems in swimming pools. The study found that the causes of deterioration in the technical condition of the system which was operated in an environment with chlorine ions were: an inappropriate manufacture of its components and the wrong choice of construction materials for the given environment of operation. Furthermore, failure to follow the manufacturer's guidelines for the operation and maintenance of the components of the ventilation system greatly precipitated its degradation and the occurrence of sick building syndrome in the swimming pool. Solutions were found and proposed in order to improve the efficiency of the ventilation system in the given swimming-pool facility.

scholarly journals Sistema de Ventilação Personalizada Instalado na Poltrona em Cabine de Aeronave: Análise da Concentração e da Eficiência na Remoção de Partículas Expiratórias

REVISTA PLURI ◽  
2020 ◽  
Vol 1 (3) ◽  
pp. 77
Author(s):  
Victor Barbosa Felix ◽  
Douglas Fabichack Jr. ◽  
Paulo Rogério Celline ◽  
Arlindo Tribess
Keyword(s):  
Air Quality ◽  
Removal Efficiency ◽  
Experimental Analysis ◽  
Ventilation System ◽  
Particle Removal ◽  
Pv System ◽  
Aircraft Cabins ◽  
Personalized Ventilation ◽  
Mode Of Transport ◽  
Ventilation Systems

As pessoas viajam cada vez mais de avião e, muitas vezes, estas viagens são longas. A qualidade do ar dentro desse meio de transporte torna-se então uma questão crucial, principalmente agora que o mundo está passando por uma pandemia causada pela COVID 19. Uma forma de melhorar a qualidade do ar e as condições de conforto térmico dentro de uma cabine de aeronave está na utilização de novos sistemas de ventilação personalizada. No presente trabalho é apresentada análise experimental da influência de um sistema de ventilação personalizada (PV) na concentração e na eficiência de remoção de partículas expiratórias em cabine de aeronave com sistema de ventilação convencional por mistura (MV). Os ensaios foram realizados em um mock-up com 12 lugares, com três fileiras de quatro poltronas. Medições de concentração de partículas foram realizadas na região de respiração, a 1,10m do piso, em todos os assentos da cabine. Os resultados mostram que a eficiência na remoção de partículas na região de respiração, considerando toda a cabine, é de até 25% para partículas de 5 a 10 μm e de até 30% para partículas de 2 a 5μm. Os resultados mostram também que a eficiência na remoção de partículas é praticamente igual para o sistema PV operando tanto no assento da janela quanto no assento do corredor para todos os tamanhos de partículas. Os resultados da eficiência de remoção de partículas mostram que o sistema PV influencia significativamente a remoção de partículas no assento no qual o sistema está operando e na cabine como um todo.Palavras-chave: Sistemas de Ventilação, Qualidade do Ar, Partículas Expiratórias, Análise Experimental, Cabines de AeronavesAbstractPeople travel more and more by plane, and often these trips are long. Air quality within this mode of transport then becomes a crucial issue, especially now that the world is experiencing a pandemic caused by COVID 19. A way to improve air quality and thermal comfort conditions inside a cabin of aircraft is in the use of new personalized ventilation systems. This work presents an experimental analysis of the influence of a personalized ventilation system (PV) on the concentration and efficiency of removal of expiratory particles in an aircraft cabin with a conventional mixing ventilation system (MV). The tests were carried out in a mock-up with 12 seats, three rows with four abreast. Measurements of particle concentration were performed in the breathing region, 1.10 m from the floor, in all seats of the cabin. The results show that the efficiency in removing particles in the breathing region, considering the entire cabin, is up to 25% for particles of 5 to 10 μm and up to 30% for particles of 2 to 5 μm. The results also show that particle removal efficiency is practically the same for the PV system operating on both the window seat and the aisle seat for all particle sizes. The results of particle removal efficiency show that the PV system significantly influences the removal of particles in the seat on which the system is perating and in the cab as a whole.Keyworks: Ventilation systems, Air Quality, Expiratory droplets, Experimental analysis, Aircraft cabins

scholarly journals Identifying mechanical ventilation issues in classrooms

2018 ◽  
Vol 44 ◽  
pp. 00055
Author(s):  
Julia Janiga ◽  
Joanna Krzempka ◽  
Aleksandra Szczerbińska
Keyword(s):  
Mechanical Ventilation ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Ventilation System ◽  
Operating Time ◽  
Mechanically Ventilated ◽  
Ventilation Systems

This article focuses on the issues of indoor air quality in mechanically ventilated classrooms. The aim of the study was to determine the reasons for inadequate air quality reported by occupants. Two different ventilation systems were assessed by measuring CO2 and VOC concentrations in classrooms during operating time. Results showed that in both cases, CO2 levels in the air, even though mostly acceptable, were exceeded throughout the measuring periods on occasion. Based on obtained data, in both cases probable causes for reported ventilation system malfunctions were proposed.

scholarly journals Increase of ventilation systems procurement and installation works efficiency

2020 ◽  
Vol 2020 (2) ◽  
pp. 77-83
Author(s):  
Orest Voznyak ◽  
◽  
Khrystyna Myroniuk ◽  
Iryna Sukholova ◽  
Oleksandr Dovbush ◽  
...  
Keyword(s):  
Objective Function ◽  
Initial Conditions ◽  
Ventilation System ◽  
Theoretical Research ◽  
Maximum Profit ◽  
Quantitative Characteristics ◽  
Different Diameters ◽  
The Given ◽  
Production Facilities ◽  
Ventilation Systems

The article presents the results of theoretical research on obtaining of the maximum profit by the installation and procurement company in the manufacture and sale of pipe billets for the installation of ventilation systems in the production premise. Graphical and analytical dependences are given. The results of research substantiate the receipt of the maximum profit in the manufacture and sale of the ventilation pipe billets of the different diameters by the installation and procurement enterprise. The purpose of the work is to increase the efficiency of ventilation system installationin production facilities, to determine the maximum profit for the installation and procurement company in the manufacture and sale of pipe billets of the different diameters of ventilation system in the presence of several restrictions on materials and manpower, identify ways to improve installation of ventilation system in production facilities of small volume and justification of the calculation method. Quantitative characteristics of the objective function under given initial conditions are established. The calculated dependences for determining the parameters of the objective function are obtained. The obtained results allow to determine the optimal parameters of the values at the given restrictions on materials and labor intensity of production. The maximum profit in the manufacture and sale of ventilation pipe billets of different diameters by the procurement and installation company is determined. Using of the graphical method and the simplex method to determine the required parameters can significantly increase the efficiency criteria for procurement and installation work and thus reduce the amount of labor and material consumption for the manufacture and installation of ventilation systems.

scholarly journals The Influence of a Ventilation on the Level of Carbon Dioxide in a Classroom at a Higher University / Wpływ Wentylacji Na Poziom Ditlenku Węgla W Pomieszczeniu Uczelni Wyższej

2015 ◽  
Vol 22 (1) ◽  
pp. 61-71 ◽  
Author(s):  
Robert Cichowicz ◽  
Henryk Sabiniak ◽  
Grzegorz Wielgosińsk
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Working Conditions ◽  
Air Pollutants ◽  
Ventilation System ◽  
Systems Design ◽  
Closed Area ◽  
Upper Limit ◽  
Ventilation Systems

Abstract Carbon dioxide can affect on human mood and working conditions in closed area. Knowledge about the level of air pollutants concentration in the room, should be a guideline to design a properly working ventilation system. For years carbon dioxide, appearing during human breathing, was not taken into consideration as a factor determining the process of ventilation systems design. At present the assessment of air quality in closed rooms is performed on the basis of measurement of concentration of carbon dioxide metabolically produced by humans that can be referred to the so-called hygienic minimum, eg the upper limit of CO2 concentration equal to 1000 ppm (0.1%).

scholarly journals Feasibility of a Passive Ventilation System with a Thermal Damper - Simulations and measurement results of an experimental house in a mild region of Japan -

2019 ◽  
Vol 111 ◽  
pp. 06047
Author(s):  
Motoya Hayashi ◽  
Hoon kim ◽  
Yoshinori Honma ◽  
Junichiro Matsunaga
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Ventilation System ◽  
Indoor Environments ◽  
Air Supply ◽  
Measurement Results ◽  
Simulation Results ◽  
Ventilation Rates ◽  
Ventilation Systems

In order to retain good indoor air quality through the year in detached houses with passive ventilation systems, the authors investigated a mechanical control air-supply method. Firstly, indoor environments in houses with passive ventilation systems with thermal dampers, were examined using a simulation program (Fresh). Secondly, a passive ventilation system with a thermal damper, an under-floorheating system with a heat pump and were installed in an airtight house at Maebashi in Japan and measurements on its ventilation characteristics and indoor air quality were made. The simulation results showed that if the thermal damper is well tuned, this mechanically controlled air-supply opening keeps ventilation rates adequate through the year especially in airtight houses. The measurement results showed that the ventilation rates were kept above the required level through the year and the TVOC concentration decreases from 3000 to 200 μg/m3 in 5 months after the construction.

Airflow and Air Quality in a Large Enclosure

1995 ◽  
Vol 117 (2) ◽  
pp. 114-122 ◽  
Author(s):  
Z. Jiang ◽  
Qingyan Chen ◽  
F. Haghighat
Keyword(s):  
Air Quality ◽  
Air Temperature ◽  
Ventilation System ◽  
Shopping Center ◽  
Variable Air Volume ◽  
Air Volume ◽  
Large Enclosure ◽  
Air Temperatures ◽  
Cfd Method ◽  
Ventilation Systems

Knowledge of air flow patterns and thermal parameters are essential in the design of a ventilation system for large enclosures. The objective of this paper is to evaluate the possibility of using computer simulation to predict the airflow pattern and removal effectiveness of ventilation systems in large enclosures. The quality of air and thermal comfort in a three-floor shopping center are studied by the computational fluid dynamics (CFD) method. Two ventilation systems are selected. In System 1, rooms are ventilated by two ceiling slot diffusers, supplying air downward into the rooms. The halls are equipped with wall jet diffusers delivering air in a horizontal direction. Airflow and air quality, under both summer and winter conditions, are investigated. In System 2, the air in each room is supplied in a radial manner by four ceiling rectangular diffusers. The hall and balconies have jet diffusers which supply air vertically downward. Different ventilation rates, outdoor air ratios and supply air temperatures are studied. Occupants are simulated by heat and CO2 sources without aerodynamic blockages. It was found that the summer and winter air temperature differences in the shopping center differ by approximately 2°C. The rectangular air diffusers should he used in the rooms and the jet diffusers in the halls and balconies. Both the variable air volume and the constant air volume methods, with an adjusted supply air temperature, can be used for air conditioning control in a large enclosure.

scholarly journals Air quality and presence of air ventilation systems inside waterpipe cafés in North Carolina

2018 ◽  
Vol 28 (3) ◽  
pp. 356-358 ◽  
Author(s):  
Andrew B Seidenberg ◽  
Elizabeth N Orlan ◽  
Mark J Travers ◽  
Erin L Sutfin
Keyword(s):  
North Carolina ◽  
Air Quality ◽  
Fine Particulate Matter ◽  
Ventilation System ◽  
Before And After ◽  
Air Ventilation ◽  
Waterpipe Cafés ◽  
Time Periods ◽  
Starting Date ◽  
Ventilation Systems

BackgroundAfter North Carolina (NC) fire inspectors detected unsafe carbon monoxide (CO) levels inside several waterpipe cafés, the state fire code was amended to include provisions regulating waterpipe cafés, adding a requirement for air ventilation. These regulations apply to new buildings constructed after 1 January 2016, but can be enforced for older buildings where there exists a distinct hazard to life. We measured air quality at a sample of waterpipe cafés before and after the starting date of this regulation and collected information on presence of air ventilation.MethodsAir quality (CO, fine particulate matter (PM2.5)) monitoring was conducted inside and outside of six waterpipe cafés in NC in September of 2015 (time 1) and September of 2016 (time 2). In addition, questionnaires were administered to managers from each waterpipe café at time 2 to determine the presence of air ventilation systems.ResultsElevated levels of CO and PM2.5 were found inside waterpipe cafés at time 1 (median CO=42 ppm; median PM2.5=379.3 µg/m3) and time 2 (median CO=65 ppm; median PM2.5=484.0 µg/m3), with no significant differences between time periods (p>0.05). Indoor levels were significantly higher than levels outside cafés at both time periods (p<0.05). All waterpipe cafés reported having an air ventilation system that was installed prior to time 1 air monitoring.ConclusionsUnsafe levels of CO and PM2.5 were observed in waterpipe cafés in NC, despite reported use of air ventilation systems. Prohibiting indoor waterpipe smoking may be necessary to ensure clean air for employees and patrons.

scholarly journals Computational Analysis of a Lecture Room Ventilation System

2020 ◽  
Author(s):  
Abayomi Layeni ◽  
Collins Nwaokocha ◽  
Olalekan Olamide ◽  
Solomon Giwa ◽  
Samuel Tongo ◽  
...  
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Minimum Cost ◽  
Solar Chimney ◽  
Lecture Room ◽  
Room Ventilation System ◽  
Ventilation Systems

The level of Indoor Air Quality (IAQ) has become a big topic of research, and improving it using passive ventilation methods is imperative due to the cost saving potentials. Designing lecture buildings to use less energy or Zero Energy (ZE) has become more important, and analysing buildings before construction can save money in design changes. This research analyses the performance (thermal comfort [TC]) of a lecture room, investigate the use of passive ventilation methods and determine the energy-saving potential of the proposed passive ventilation method using Computational Fluid Dynamics (CFD). Results obtained showed that air change per hour at a wind velocity of 0.05 m/s was 3.10, which was below standards. Therefore, the lecture hall needs external passive ventilation systems (Solar Chimney [SC]) for improved indoor air quality at minimum cost. Also, it was observed that the proposed passive ventilation (SC) system with the size between 1 and 100 m3, made an improvement upon the natural ventilation in the room. There was a 66.69% increase after 10 years in the saving of energy and cost using Solar Chimney as compared to Fans, which depicts that truly energy and cost were saved using passive ventilation systems rather than mechanical ventilation systems.

scholarly journals Implementation of an algorithm for determining the effectiveness of ventilation and energy efficiency in industrial ventilation systems

2019 ◽  
Vol 111 ◽  
pp. 06038
Author(s):  
Marius Adam ◽  
Olga Bancea ◽  
Ioan Aschilean
Keyword(s):  
Energy Efficiency ◽  
Air Quality ◽  
Ventilation System ◽  
Source Control ◽  
Indoor Climate ◽  
Night Time ◽  
Industrial Ventilation ◽  
Ventilation Efficiency ◽  
Ventilation Rates ◽  
Ventilation Systems

The requirements for good indoor air quality and energy efficiency have often been considered to conflict with each other, however, buildings with low energy consumption in Europe seem to have also a lower rate of building related health symptoms. The paper aims to develop a succession of necessary operations, an algorithm, for the determination of ventilation efficiency and energy efficiency in industrial ventilation systems, starting from a general model that will be developed according to the particularities of the industrial ventilation system. These systems are important as they are related both to energy cost and indoor climate management as well as to the health of the occupants. The stages of algorithm development will include: source control and efficient removal of contaminants, proper location of fresh air intakes, cleaning of intake air, efficient air distribution in rooms with improved ventilation efficiency, heat recovery from exhaust air, night time ventilation cooling, ventilation rates control by air quality, correct balancing of air flows and controlling the indoor climate locally.

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