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This study aimed to investigate volatile organic compound (VOC) emission fluxes from a new air filtermedia and a used one. The emission tests from air filters were carried out by the small chambermethod and a new chamber method developed in this study. And the VOCs in an actual air conditioningunit were measured in order to confirm the emission from the air filter. The some VOCs emitted fromused air filter could be detected in the emission tests. The air filter medias emitted formaldehyde andother organic compounds, and airflow through filter media changed emission fluxes.

The purpose of this paper is to analyze the indoor thermal environment and ventilation efficiencycreated by various heating and ventilation systems using CFD. In the case of one room, the value ofmean local air exchange efficiency????*1 of breathing zone*2 becomes about 1.0, because fresh airspreads completely in the room when air-conditioners are operated. In contrast, when air-conditionersare not operated, the mean ?? becomes smaller than 1.0, and the area of poor ventilation efficiencybecomes large.

This paper reports the effects of air quality and thermal environment on motivation and performance forstudents. The psychological condition of subjects can strongly influence their performance for learning.In this paper, the motivation for learning is evaluated by using a questionnaire as a self-assessmentform. According to the previous research, motivation for learning becomes biased when the learningperformance of the student is measured.

In recent years, in the quest focused about energy conservative building design, as a high efficiencyair conditioning scheme, the variable air volume (VAV) systems owe their growing popularity in heating,ventilation and air conditioning (HVAC) applications. This paper reports the simulation study toinvestigate the inherent operational characteristics of direct expansion (DX) VAV air conditioning (A/C)unit when the supply air fan and compressor speeds are varied based on the thermal load persisting inthe conditioned space.

Field measurements of the indoor climate have been carried out in 128 lightweight timber-framedetached houses in Finland and in Estonia during the years 2002-2005. The temperature and relativehumidity were continuously measured in bedrooms, living rooms and outdoors for each house at 1-hourintervals over a 1-year period.

Specific and effective measures for international issues, such as prevention of global warming, energysaving, reduction of environmental loads, are urgently required.The improvement of the insulation efficiency of the house and the building is demanded as the part.For that purpose, it is also necessary to determine whether installed insulating materials have beeninstalled properly, and whether they can actually demonstrate the expected performance.On the basis of the results of various surveys, the infrared method was proposed as nondestructivein-site measuring method enabling simple measur

The Egyptian community in its path for rapid development is endeavouring to make all necessary andappropriate measures to enhance the efficiency of energy utilization and increase the beneficiation ofthe energy resources. Throughout the Nation, Energy resources are widely used and consumptionrates are in general exceeding the International accepted values. The use and application of new andrenewable energy sources can be harnessed to design, construct and operate a solar building ofmoderate size for desert applications.

This paper reviews the previous attempts to evaluate the Indoor Air Quality (IAQ), investigatespreviously proposed IAQ factors and analyses the evaluation methods of these factors. The presentwork introduces, also, a new hypothesis of the optimum HVAC airside system design of the surgicaloperating theatres to achieve the comfort and hygiene levels. The present work is devoted to proposeand formulate a new scale capable of adequately evaluating the airflow pattern in the surgicaloperating theatres. The proposed new scale is proposed to cover the local and overall air qualityevaluations.

Airflow characteristics in ventilated and air-conditioned spaces play an important role to attain comfortand hygiene conditions. This paper utilizes a 3D Computational Fluid Dynamics (CFD) model toassess the airflow characteristics in ventilated and air-conditioned archeological tombs of EgyptianKings in the Valley of the Kings in Luxor, Egypt .

The objective of this study is to provide research results of the actual conditions concerning theconcentrations of PM10, PM2.5, PM1 and CO2 among particle and gaseous pollutants in a subwaycarriage. Mean concentrations of PM10, PM2.5 and PM1, and CO2 in a subway carriage wereinvestigated as 215.1101.4 ? m-3, 86.938.6 ? m-3, 27.011.4 ? m-3, and 1,588714 ppm,respectively. These mean concentrations in a subway carriage were higher when it ran on anunderground track than on a ground track.