scholarly journals A Novel Test Cage With an Air Ventilation System as an Alternative to Conventional Cages for the Efficacy Testing of Mosquito Repellents

2010 ◽  
Vol 47 (6) ◽  
pp. 1116-1122 ◽  
Author(s):  
U. Obermayr ◽  
A. Rose ◽  
M. Geier
Keyword(s):  
Ventilation System ◽  
Test Cage ◽  
Air Ventilation ◽  
Mosquito Repellents

scholarly journals Indoor Air Quality Real-Time Monitoring in Airport Terminal Areas: An Opportunity for Sustainable Management of Micro-Climatic Parameters

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3798 ◽  
Author(s):  
Sara Zanni ◽  
Francesco Lalli ◽  
Eleonora Foschi ◽  
Alessandra Bonoli ◽  
Luca Mantecchini
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Real Time ◽  
Indoor Air ◽  
Electronic Monitoring ◽  
Ventilation System ◽  
Real Time Monitoring ◽  
Airport Terminal ◽  
Air Ventilation ◽  
Gaseous Contaminants

Indoor air quality (IAQ) management in public spaces is assuming a remarkable importance. Busy environments, like airport terminals, are currently regarded as possible hotspots and IAQ is a crucial element for passengers and staff protection, as well as a key aspect of airport passenger experience. A one-month monitoring period has been performed on IAQ in the airport of Bologna (Italy), as prototypal example of large regional airport. Four strategic areas within the airport have been equipped with electronic monitoring platforms, including different contaminants and two microclimatic sensors. Data suggest that daily variation in IAQ parameters typically follow the activity pattern of the different environments under study (i.e., passengers’ flows) for gaseous contaminants, where particulate matter counts oscillate in a definite range, with a significant role played by ventilation system. Gaseous contaminants show a correlation between indoor and outdoor concentrations, mainly due to airside activities. Micro-climatic comfort parameters have been tested to match with standards for commercial environments. As results appears in line with typical households IAQ values, the current air ventilation system appears to be adequate. Nevertheless, an integrated air management system, based on real-time monitoring, would lead to optimization and improvement in environmental and economical sustainability.

Acoustical Improvements with Natural Air Ventilation in the Liu Institute for Global Issues at the University of British Columbia

2011 ◽  
Vol 6 (1) ◽  
pp. 114-122
Author(s):  
Zohreh Razavi ◽  
Max Richter ◽  
Murray Hodgson ◽  
Alireza Khaleghi
Keyword(s):  
Natural Ventilation ◽  
Ventilation System ◽  
Green Building ◽  
Optimized Design ◽  
Global Issues ◽  
University Of British Columbia ◽  
Air Ventilation ◽  
The University ◽  
Building Designs

Low speech privacy in shared and private offices in one of the early generation of a “green” building resulted in occupants' dissatisfaction. This problem is experienced in Liu institute with a natural-ventilation system. Such a system requires low air-flow resistance which is achieved by large openings which will result in noise transmission between various spaces within the building. The poor acoustical quality in this building resulted in occupants' noise complaints which were further investigated by way of relevant acoustical measurements. CATT-Acoustic software was utilized to modify the acoustical quality of the building without any disturbance to the occupants. The optimized design of the transfer box above the office door was selected based on CATT-Acoustic predictions. The acoustical measurements were conducted after installation of the transfer box above the office door. The measurements' results agreed with the predictions which led to improved speech privacy to an acceptable level between the office and the corridor in Liu Institute. More work should be done to improve the acoustical quality of natural-ventilated building to conform to ANSI standards.1The results of this study strongly support including acoustics in “green” building designs with natural ventilation to avoid users' complaints.

scholarly journals Analysis of alternative ventilation strategies for existing multi-family buildings using CONTAM simulation software

2020 ◽  
Vol 172 ◽  
pp. 09004
Author(s):  
Xinxiu Tian ◽  
Jamie Fine ◽  
Marianne Touchie
Keyword(s):  
Ventilation System ◽  
Poor Performance ◽  
Simulation Software ◽  
Base Case ◽  
Building Model ◽  
System A ◽  
Airflow Distribution ◽  
Air Ventilation ◽  
Ventilation Strategies ◽  
Post War

In many existing high-rise multi-family buildings, a pressurized corridor ventilation system is used to meet outdoor air ventilation requirements. However, this system often has poor performance, leading to under- or over- ventilation in different parts of a building. This study examines three ventilation strategies including: the base case, which is a traditional pressurized corridor ventilation system, a direct-to-suite ducted ventilation system, and a suite-based HRV ventilation system. A building model was constructed in CONTAM using features of a typical post-war multi-family building in Toronto, Canada. All three strategies were simulated using CONTAM under both summer and winter conditions. The resulting outdoor airflow delivery rates to the suites and corridor pressure differentials were compared to assess the effectiveness of each strategy. The results show that the suite-based HRV strategy is able to provide adequate ventilation airflow to individual suites in both summer and winter. In the traditional pressurized corridor system and the direct-to-suite ducting system, the airflows delivered to the suites located at the top of the building are higher than those delivered to the suites located at the bottom of the building. This uneven airflow distribution is more pronounced in winter when stack effect impacts the ventilation system more significantly.

Experimental and Simulation Validation Methods of Local Exhaust Ventilation (LEV) in Training Facilities Building

2013 ◽  
Vol 315 ◽  
pp. 997-1001 ◽  
Author(s):  
Ng Chee Seng ◽  
Abdul Mutalib Leman ◽  
Azmahani Sadikin
Keyword(s):  
Indoor Air ◽  
Ventilation System ◽  
Percentage Error ◽  
Local Exhaust Ventilation ◽  
Geometry Model ◽  
Exhaust Ventilation ◽  
Simulation Validation ◽  
Air Ventilation ◽  
Computational Fluid Dynamics Cfd ◽  
Real Flow

LEV is a ventilation system that collects and sucks out particles such as dusts, mists, gases, vapors or fumes out of work station, so that they can’t be breathed in by occupants. There is a lot of LEV allocated and installed in order to help protecting occupants’ health but it doesn’t work properly. To overcome this issue, computational fluid dynamics (CFD) will be implemented. Past studies CFD techniques represent a very significant improvement of air ventilation systems. However, CFD is just a tool in prediction model, which can lead to inaccuracy of predicting airflow due to problems with pre-processing, solver and post-processing with parameter from actual experimental results. As of yet, it is not possible to 100% accurately simulate airflow around a body. These codes are simply models which are close to that of a real flow, but not an exact match. All of these require validation to help minimizing percentage error in CFD methodology. Several strategies are needed to boost effectiveness of LEV in terms of predicting airflow in a geometry model. The outcome of this research can be used as a benchmark or guideline for industries to help improving indoor air quality (IAQ).

Test and analysis model correlation - redesign of HTV's air ventilation system

2010 ◽  
Author(s):  
Hiroki Matsumoto ◽  
Satoshi Fujiwara ◽  
Takeshi Miyamoto ◽  
Fumio Kondo ◽  
Tetsuya Sakashita ◽  
...  
Keyword(s):  
Ventilation System ◽  
Analysis Model ◽  
Air Ventilation ◽  
Model Correlation

scholarly journals LATENT HEAT ENERGY STORAGE DEVICE AS А PART OF THE VENTILATION SYSTEM OF INDIVIDUAL HOUSE

2017 ◽  
Vol 1 (48) ◽  
pp. 238-243
Author(s):  
B. A. Kutnyi ◽  
B. R. Novakh
Keyword(s):  
Energy Efficient ◽  
Heat Storage ◽  
Ventilation System ◽  
Heat Energy ◽  
Storage Device ◽  
Energy Prices ◽  
Air Ventilation ◽  
Seasonal Heat ◽  
Quantity Of Heat ◽  
Ventilation Systems

Energy efficient ventilation systems allow to minimize the heat energy consumption for heating supply air, which is very relevant in the context of rising energy prices. It is dealt with the variant of the installation seasonal phase-change heat storage device in the system of ventilation with recuperation of heat energy. Preliminary engineering calculations were perfomed and the quantity of heat storage material (water) necessary for the operation of the ventilation system was determined. The diagrams of change the temperature of the air at the output from the accumulator and distribution of water and ice during the heating period were given. In the article the calculation of seasonal heat storage device on the basis of the water in the supply air ventilation systems are considered , which allows to minimize costs of thermal energy for heating  the outside air before it enters to the premises of the house. It is proved that in modern economy conditions development the energy-efficient ventilation system is a promising direction of research and implementations.

DEVELOPMENT OF ADAPTIVE VENTILATION IN MULTIFUNCTIONAL LARGE-SCALE SPACE OF PUBLIC BUILDINGS

2021 ◽  
pp. 19-29
Author(s):  
Виталий Владимирович Шичкин ◽  
Мария Николаевна Жерлыкина ◽  
Сергей Анатольевич Яременко ◽  
Сергей Анатольевич Соловьев
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Large Scale ◽  
Numerical Study ◽  
Ventilation System ◽  
Public Buildings ◽  
Air Conditioners ◽  
Advantages And Disadvantages ◽  
Air Ventilation ◽  
Forced Air

Проанализирована актуальность строительства объектов культурно-массового назначения. Описана целесообразность проектирования многофункциональных трансформируемых помещений для общественных зданий. Приведены достоинства и недостатки применения рециркуляции воздуха как способа энергосбережения. Акцентировано внимание на поддержании чистоты воздуха в помещении и способах борьбы с бактериями и вирусами в приточном воздухе. Предложена схема многозональной общеобменной вентиляции воздуха без рециркуляции с блокированием кондиционеров для взаимозаменяемости с целью обеспечения микроклимата в многофункциональных помещениях общественных зданий. Описана последовательность работы системы вентиляции в теплый и холодный период года. Разработана система рекуперации с промежуточным холодоносителем для теплого периода года. Приведено описание работы установки кондиционирования воздуха. На примере реально существующего объекта выполнено численное исследование режимов работы системы вентиляции с рекуперацией теплоты и холода для трансформируемого помещения. Построен график для определения граничных условий работы рекуператора исходя из соотношения между интенсивностью теплообмена за счёт конвекции и интенсивностью теплообмена за счёт теплопроводности. При различных наружных температурах воздуха и расчетных температурах уходящего воздуха построены графики определения оптимальных параметров температуры воздуха на входе в утилизатор при оптимальных значениях водяного эквивалента . Выявлены и описаны режимы работы кондиционеров с теплоутилизатором в теплый период года, работающих в составе многозональной общеобменной вентиляции воздуха с блокированием кондиционеров для взаимозаменяемости. В ходе численного исследования выявлено, что наибольшая энергоэффективность системы вентиляции с рекуператором будет достигнута при принятии в качестве оптимального значения водяного эквивалента W = 3. We analyzed the relevance of cultural facilities construction. As well, we described the expediency of designing multifunctional transformable spaces for public buildings. Moreover we presented advantages and disadvantages of using air recirculation as a method of energy saving. A special attention is focused on maintaining indoor air clean and on various ways of combatting bacteria and viruses in the intake air. We offered a scheme of multi-zone forced air ventilation without recirculation with blocking air conditioners for interchangeability in order to provide a microclimate in multifunctional spaces of public buildings. We described the sequence of operations in the ventilation system in warm and cold seasons. We also developed a recuperation system with an intermediate refrigerant for warm seasons. The article presents a detailed description of the air conditioning unit operation. We carried out a numerical study of the operating modes of the ventilation system with heat and cold recovery for transformable spaces on the example of a real-existing facility. We show a graph to determine the boundary conditions of the recuperator operation based on the ratio between the intensity of heat transfer due to convection and the intensity of heat transfer due to thermal conductivity. At various outside air temperatures and design temperatures of the outgoing air, we created some graphs for determining the optimal parameters of the air temperature at the inlet to the heat exchanger at the optimal values of the water equivalent. We identified and described several modes of operation of air conditioners with a heat exchanger in warm seasons, operating as part of a multi-zone forced air ventilation with blocking air conditioners for interchangeability. In the course of a numerical study, it was revealed that the highest energy efficiency of a ventilation system with a recuperator could be achieved when the water equivalent value W = 3 is taken as the optimal value.

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