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

Performance of Intermittent Personalized Ventilation Assisting Mixing Ventilation in the Presence of Indoor Disturbance

2019 ◽  
Author(s):  
Douaa Al-Assad ◽  
Kamel Ghali ◽  
Nesreen Ghaddar
Keyword(s):  
Ventilation System ◽  
Pressure Gradients ◽  
Breathing Zone ◽  
Dynamics Model ◽  
Pv System ◽  
Low Frequencies ◽  
Air Ventilation ◽  
Airflow Field ◽  
Personalized Ventilation ◽  
Ventilation Systems

Abstract In this work, an office space is considered, equipped with an intermittent personalized ventilation (PV) system assisting a conventional mixing ventilation system. In ideal offices with no disturbances, it was proven that an intermittent PV average flow rate of 7.5 L/s and frequency of 0.86 Hz could enhance comfort compared to a steady PV and provide protection against contaminants present in the macroclimate. However, office spaces are subject to many disturbances, which could deteriorate the performance of air ventilation systems. In this work, an office door is considered to open disturbing the flow field by establishing pressure gradients. To conduct this study, a 3D computational fluid dynamics model was developed to predict the airflow field variables as well as contaminants’ concentration in the occupant-breathing zone. The model was used to assess the ability of the ventilation systems in maintaining its optimal operating parameters (0.86 Hz) obtained in ideal conditions. Results showed that the optimal PV frequency did not assure the same level of air quality. In fact, ventilation effectiveness decreased by 18% due to the opening door which pulled the PV jet away from the occupant’s breathing zone (BZ). Therefore, in office spaces with high disturbance levels, it is better off to operate the PV under steady state conditions to avoid further disturbance of the jet, or to operate the intermittent PV at low frequencies of 0.3 Hz to 0.5 Hz to minimize turbulence intensities created by the jet fluctuations.

scholarly journals Operation Testing of an Advanced Personalized Ventilation System

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1596 ◽  
Author(s):  
Csáky ◽  
Kalmár ◽  
Kalmár
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Distribution System ◽  
Noise Level ◽  
Background Noise ◽  
Ventilation System ◽  
Air Distribution ◽  
Personalized Ventilation

Using personalized ventilation systems in office buildings, important energy saving might be obtained, which may improve the indoor air quality and thermal comfort sensation of occupants at the same time. In this paper, the operation testing results of an advanced personalized ventilation system are presented. Eleven different air terminal devices were analyzed. Based on the obtained air velocities and turbulence intensities, one was chosen to perform thermal comfort experiments with subjects. It was shown that, in the case of elevated indoor temperatures, the thermal comfort sensation can be improved considerably. A series of measurements were carried out in order to determine the background noise level and the noise generated by the personalized ventilation system. It was shown that further developments of the air distribution system are needed.

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.

Experiment on Removal Efficiency of Dust Particle Using a Ventilation Test House

2013 ◽  
Vol 726-731 ◽  
pp. 2173-2176
Author(s):  
Yang Lv ◽  
Genta Kurihara ◽  
Hiroshi Yoshino
Keyword(s):  
Dust Particle ◽  
Removal Efficiency ◽  
Experimental Studies ◽  
Exhaust System ◽  
Clear Relationship ◽  
Particle Removal ◽  
Particle Count ◽  
Test House ◽  
Animal Dander ◽  
Ventilation Systems

Dust particle which includes corpses and feces of the mite, animal dander, cockroaches, and mould spores can reach the lung of human and then trigger asthma disease easily. In this research, experimental studies were carried out in order to examine particle removal efficiency in a room with two ventilation systems: a ceiling exhaust system and a slit exhaust system. The results indicated that there was no clear relationship between removal efficiency and two different outlet locations. Also, from the results after the decay, the particle count in the case of the ceiling exhaust was higher than that in the case of the slit exhaust.

Human Perception Relation between Thermal Comfort and Air Movement for Ceiling Mounted Personalized Ventilation System

2014 ◽  
Vol 935 ◽  
pp. 329-332
Author(s):  
Bin Yang ◽  
Chandra Sekhar
Keyword(s):  
Thermal Comfort ◽  
Ventilation System ◽  
Human Perception ◽  
Office Work ◽  
Pv System ◽  
Movement Perception ◽  
Ambient Temperatures ◽  
Air Movement ◽  
Air Temperatures ◽  
Personalized Ventilation

As one kind of newly developed personalized ventilation (PV) system, the relation was explored between thermal comfort and air movement perception/acceptability/preference with tropical subjects, who had become passively acclimatized to hot conditions in the course of their day-to-day life. The tests were conducted in field environmental chamber (FEC) of National University of Singapore. 32 subjects (16 males and 16 females), performed normal office work, can choose to expose to four different PV airflow rates (4, 8, 12, 16 L/s) so as to simulating individual control. Ambient temperatures of 26°C and 23.5 °C and PV air temperatures of 26 °C, 23.5 °C and 21 °C were utilized to conduct parametric variation studies. Each combination was maintained for 15 minutes during which the subjects responded to computer-administered questionnaires. Under different PV airflow rates and ambient/PV temperature combinations, the relation between thermal comfort and air movement perception/acceptability/preference was analyzed.

Sign in / Sign up

Export Citation Format

Share Document