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 Occupational exposure to particles and air pollutants in a car paint workshop

2021 ◽  
Vol 31 (Supplement_2) ◽  
Author(s):  
Ana Ferreira ◽  
António Loureiro ◽  
Silvia Seco ◽  
João Paulo Figueiredo ◽  
Susana Paixão ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Occupational Exposure ◽  
Occupational Health ◽  
Air Pollutants ◽  
Statistical Tests ◽  
Well Being ◽  
Atmospheric Pollutants ◽  
Inhalable Particles ◽  
The Government

Abstract Background In auto paint workshops there are several chemical, physical and biological agents that are harmful to health, making it essential to guarantee the well-being and safety of workers. In this sense, the assessment of the Indoor Air Quality (IAQ) of these places, in an associated context of occupational health, proves to be important. Methods The present study had as main objective to evaluate the occupational exposure of workers in an automobile painting workshop to particles and air pollutants. The data collection consisted of the evaluation of air quality, using for this purpose, the assessment of atmospheric pollutants carbon monoxide (CO), carbon dioxide (CO2), Volatile Organic Compounds (VOC), formaldehyde (CH2O), carbon dioxide sulfur (SO2), nitrogen dioxide (NO2), hydrogen sulfide (H2S) and particulate matter (PM2.5, PM10, breathable and inhalable particles) and the meteorological variables temperature and relative humidity. The collected data was processed using the statistical software IBM SPSS version 27.0. The interpretation of the statistical tests was performed with a 95% confidence level for a maximum random error up to 5%. Results We found that the concentrations of inhalable particles recorded in some workstations exceeded the legally established exposure limit value. Conclusions IAQ should be a priority concern for the government and for all professionals working in the area of Occupational Health and Safety having in mind the implementation of measures that promote the continuous improvement of the IAQ of the facilities, thus guaranteeing a good assessment and monitoring of workstations, preventing atmospheric pollutants from reaching concentrations that could put workers' health at risk.

scholarly journals Analysis of Various Ventilation Systems Due to the Quality of Indoor Air in Educational Buildings

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 29
Author(s):  
Katarzyna Gładyszewska-Fiedoruk ◽  
Vasyl Zhelykh ◽  
Andrii Pushchinskyi
Keyword(s):  
Carbon Dioxide ◽  
Computer Simulation ◽  
Air Quality ◽  
Knowledge Acquisition ◽  
Indoor Air ◽  
Educational Buildings ◽  
Building Ventilation ◽  
Ventilation Systems

The quality of internal air is one of the factors that affect the pace and quality of knowledge acquisition. Therefore, it is important that the classrooms have high air quality. Using computer simulation, the effect of various building ventilation variants on air quality in classrooms was analyzed. As an indicator of air quality, the concentration of carbon dioxide in school halls was assumed.

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 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 Indoor air quality modelling and measurements of a studio apartment with a mechanical exhaust system

2018 ◽  
Vol 44 ◽  
pp. 00171 ◽  
Author(s):  
Nina Szczepanik-Ścisło ◽  
Agnieszka Flaga-Maryańczyk
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Ventilation System ◽  
Family Members ◽  
Exhaust System ◽  
Air Quality Modelling ◽  
The Family ◽  
Operation Duration

The aim of the research were measurements and an attempt to model the indoor air quality (IAQ) within a studio apartment with a mechanical exhaust system, manually controlled by the occupants. The authors based the modelling on the occupancy schedule of the family members and the recorded operation duration of the ventilation system. The purpose of the performed analysis was to answer the question if it is possible and to what extent to reflect numerically the conditions within the tested object. The authors studied also the carbon dioxide level in the context of controlling the system by the residents. The simulations were carried out using the CONTAM software, developed by NIST (National Institute of Standards and Technology).

scholarly journals Kualitas Udara Selama Perjalanan di Kapal Motor Camara Nusantara 3

2020 ◽  
Vol 8 (2) ◽  
pp. 61-66
Author(s):  
D. Talithania ◽  
Salundik ◽  
A. Yani
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Concentration Level ◽  
Ventilation System ◽  
Threshold Value ◽  
Normal Range ◽  
Gas Concentration ◽  
Mode Of Transportation ◽  
Methane Carbon

The Camara Nusantara Ship is a mode of transportation used for transporting cattle to various islands. The journey from Kupang, East Nusa Tenggara to Jakarta took five days. The gases that produced during the trip on the ship were ammonia, methane, carbon dioxide, and carbon monoxide. This aim of research to analysis the air quality of each deck on the ship during transportation and inform the threshold of gas concentration as well as strategies to improve air quality for livestock on the Camara Nusantara Ship. Measurements were taken three times: morning (8 am), noon (12 pm) and afternoon (4 pm). Observation of the gas concentration level was carried out for 10 - 15 minutes. The study was conducted observation, and data analysis was done descriptively. The results showed that the level of gas concentration still in the normal range and below the threshold value and the microclimate on the deck still in the normal range. Another factor that influence air quality were still in the safe category, namely wind speed. Strategies that can be applied to anticipate the decline in air quality by improving the ventilation system on the ship by focusing more on the engine airflow on the vessel.

scholarly journals Vpliv omejitve gibanja med epidemijo Covid-19 na obremenjevanje ozračja v Sloveniji

2021 ◽  
Author(s):  
Marjan Senegačnik ◽  
Davorin Žnidarič ◽  
Drago Vuk
Keyword(s):  
Carbon Dioxide ◽  
Particulate Matter ◽  
Air Quality ◽  
Air Pollutants ◽  
Road Traffic ◽  
Virus Spread ◽  
Negative Effects ◽  
Positive Effects ◽  
Entire World ◽  
Source Of Pollution

In 2020 the entire world was severely affected by COVID -19 epidemics. Because of preventing of the SARS Cov 2 virus spread there was necessary to introduce considerable restrictions of movement of citizens. This resulted in various negative effects in the field of economy. However, as road traffic is an important source of pollution – particularly of emissions of air pollutants and greenhouse gases it could be expected that these mobility restrictions result in certain positive effects on the environment. The paper will try to estimate the air quality during the period of epidemics when mobility was severely restricted (second half of March and April 2020, second half of October, November and December 2020). The review will be limited to those kinds of pollutants which are particularly related to road traffic (nitrogen oxides, particulate matter, ozone) as well as to carbon dioxide as the most important greenhouse gas.

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.

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