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43 articles for “Ventilation”
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Research ArticleOpen accessEvery word in the titleAnalysis of Indoor CO2 Concentration Using Split Ventilation Systems as an Indicator of COVID-19 TransmissionManuel Batista, Oscar Bulgim, Ericka Matus et al.We measured the indoor CO2 concentration in occupied areas with ventilation systems that recirculate air without an external air supply. The average time required to achieve the highest probability of contagion was also measured based on the number of participants in the group. Three different experimental groups were evaluated: Group One (G1), which included 5 participants; Group Two (G2), with … …American Journal of Applied Sciences, Vol. 20, Issue 1 · 23 Aug 2023 · 6,057 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleTHE EFFECT OF VENTILATION AND ECONOMIZER ON ENERGY CONSUMPTIONS FOR AIR SOURCEHEAT PUMPS IN SCHOOLSNihal Al Raees, Nabil Nassif, Fouad Al RifaieThe study discusses the applications of CO2-based demand-controlled ventilation DCV strategy integrated with the economizer for air source heat pumps in schools, investigates their impact on the annual heating, cooling and total energy consumption, also determines the potential savings achieved in different USA locations. The study includes detailed energy analysis on an existing middle school through whole building simulation energy … …American Journal of Engineering and Applied Sciences, Vol. 7, Issue 1 · 18 Mar 2014 · 8,390 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleNatural Ventilation of Indoor Air Temperature: A Case Study of the Traditional Malay House in PenangAhmad Sanusi Hassan, Mahyuddin RamliProblem statement: It was the aim of the study to analyze the level of performance of natural air ventilation with a case study of the traditional Malay house in Penang, Malaysia. This study provided information on the architectural design in relation to natural air ventilation. It promoted passive design in contrast to most housing design which has poor natural air … …American Journal of Engineering and Applied Sciences, Vol. 3, Issue 3 · 30 Sep 2010 · 11,967 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleFocusing of the Flow Capture for Local Exhaust Ventilation SystemsS. Y. Spotar, A. L. SorokinProblem statement: The extraction hoods commonly used as inlet element of the local ventilation systems exhibit limited emission capture over moderate distances from the source of the hazardous emissions. Proposed inclusion of a swirling peripheral jet was found to increase the effective length over which the extraction hood successfully captures harmful fumes. However information on a detailed pattern field of … …American Journal of Applied Sciences, Vol. 7, Issue 6 · 30 Jun 2010 · 7,333 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleTHE USE OF DIFFERENT LEVELS OF MULTI-ROOM MODELING APPROACH-APPLICATION TO BUILDING POLLUTION TRANSPORT AND EFFICIENCY OF OFF-HOUR VENTILATIONAhmed Cherif MegriSeveral building simulation programs have been developed for design, analysis and prediction of the distribution of temperature, airflow and heat transfer between inside and outside of a building and/or between different zones of the same building. These programs are categorized as mono-zone models, multi-room models, zonal models, Computational Fluid Dynamics (CFD) models and multi-zone models. The number of computer programs … …American Journal of Engineering and Applied Sciences, Vol. 7, Issue 1 · 25 Mar 2014 · 7,773 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEffective Ventilation Parameters and Thermal Comfort Study of Air-conditioned OfficesRoonak Daghigh, Kamaruzzaman SopianThe study presents objective and subjective studies of thermal comfort levels and ventilation characteristics of two air-conditioned postgraduate study offices. The observations were performed at the offices of Department of Electrical and Electronic Engineering, in University Putra Malaysia. Thermal comfort variables were measured while the students answered a survey on their sensation of the indoor climate. Concurrently, tracer gas analysis, … …American Journal of Applied Sciences, Vol. 6, Issue 5 · 31 May 2009 · 7,590 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleThermal Control of a Greenhouse by Variation in Ventilation Rate using a Fuzzy Parallel Distributed Compensation Controller with an RST Regulator in Each RuleElyes Feki, Amine Chouchaine, Abdelkader MamiProblem statement: The greenhouse has uncontrollable inputs that affect its climate, which arises the difficulty to regulate its inside temperature. The solution can be found using a multi-system approach like the Takagi-Sugeno System from which a design of a Parallel Distributed Compensation (PDC) controller is performed. However, a stability problem arises and was negotiatesd in general based on a Lyapunov … …American Journal of Applied Sciences, Vol. 9, Issue 7 · 27 Apr 2012 · 7,101 accessesView PDFCite
Research ArticleOpen accessIn the keywordsIdentification of Retrofits Needed in Old Office Buildings to Achieve Thermal ComfortChipozya Tembo Silungwe, Josephine Mutwale Ziko, Edward Jims SakalaBuilding designs normally are made to offer a given level of comfort to occupants without any mechanical intervention. However, with the advent of global warming temperatures globally have been seen to rise making the occupants of most buildings uncomfortable. The immediate solution has been to add mechanical ventilation, which comes at an added cost of installation and running a building. … …American Journal of Engineering and Applied Sciences, Vol. 12, Issue 3 · 18 Sep 2019 · 7,373 accessesView PDFCite
Research ArticleOpen accessIn the keywordsSpace Quality of Two Indonesian Mosques: Architectural Style, Development Process and Environmental ConditionMohhamad Kusyanto, Imam Adlin Sinaga, Sugeng Triyadi et al.Mosque buildings in Indonesia show the influence of architectural styles from the Middle East and other parts of the world. Today, information technology and the development of architectural schools play important roles in mosque styles in Indonesia. This study compared two Indonesian mosques (the Cabean and Eco Pesantren mosques in Central and West Java, respectively) in different architectural styles and … …American Journal of Environmental Sciences, Vol. 15, Issue 1 · 2 Mar 2019 · 9,098 accessesView PDFCite
Research ArticleOpen accessIn the keywordsIndoor Environmental Comfort in Malaysian Urban HousingYaik-Wah LimIn Malaysia, terraced houses have been rapidly constructed since 50 years ago and account for 44% of the existing urban housings. However, these houses have very limited use of natural ventilation and daylighting due to openings with small window-to-floor ratio. The deep plan design causes gloomy indoor spaces, low air change rate and poor indoor air quality. Studies showed that … …American Journal of Environmental Sciences, Vol. 9, Issue 5 · 22 Nov 2013 · 7,470 accessesView PDFCite