The thermal performance of the building envelope is mainly required for guaranteeing a comfortableand hygienic interior climate. A roof is a part of the building envelope which provides protection from thethermal damage of the sun. To improve this protection ability, we can consider using a ventilated roof,which has a ventilation layer known as a cavity, beneath the roof cover panel.The objective of this study is to evaluate the influence of such factors as the slope of the roof, size orshape of the openings (i.e.

Conventional multiple types of perfluorocarbon tracers use the number of gases equal to the number of zones (n). The possible n×n+n airflows are solved from the mass balance of the gas and the airflow balance. However, some airflows may not occur because

Heating and cooling of buildings may be done by water based radiant systems, where pipes areembedded in the concrete slabs between each storey. Hundreds of buildings with such systems arenow being constructed or are in operation in Europe.Because these types of systems are using the building mass for heating and cooling it is oftenquestioned how the systems should be controlled and operated. The present paper presents aparametric study of different control and operation concepts for both cooling (summer) and heating(winter) periods.

The indoor air quality management of the railroad passenger cabin is a hot environmental issue inmany countries. Especially, particulate matters are known to be harmful for lung and bronchus, andhigh concentration of carbon dioxide may cause headache and dizziness. Therefore, new regulation tolimit the particulate matters and carbon dioxide concentrations in the railroad passenger cabin is underpreparation in Korea. In this study, a new concept of an integrated novel air cleaning system for railroadpassenger cabin was suggested.

This research determines chemical substance removal rates of domestic air cleaners using with thepollutant constant-emission test. In previous studies, we have already reported the formaldehyderemoval rates of room air cleaners and the high accuracy of our method for predicting indoor pollutantconcentration. In the present study, the VOCs removal rates of room air cleaners were measured.Gas-phase contaminants were supplied to the environmental test-chamber using a custom-builtemission device. And performance evaluation test was conducted to two kinds of air cleaners.

The International Organization for standardization (ISO), Technical Committee 163 "ThermalPerformance and Energy Use in the Built Environment" (ISO/TC 163) is dealing with development oftools that can be used to design and construct or retrofit energy efficient buildings and installations. Theoverall aim for this is to reduce our dependency of non-renewable resources and to reduce theemission of harmful substances to the air. Methods are needed for the evaluation of the energyperformance of complete buildings and parts of buildings or building installations.

Home electrical appliances release hazardous chemical substances produced by the effects of heatingduring their operation. The present study investigated the emission rates of chemical substances onhome electrical appliances such as microwave ovens, vacuum cleaners, electric heaters, electricblankets, multimedia players, electronic dictionaries, MD players and notebook PCs.The VOCs emission rates of comparatively small products were measured using a small-scaleenvironmental chamber with a volume of 0.065 [m3].

In approach to alleviating the problems causing ‘sick building syndrome’, many types of indoor air pollution removal products have been developed. In the various performance evaluation methods for these removal products, the pollutant constant-emission te

This study is focused on the efficient use of cross-ventilation in a densely populated area by using roofwindows in particular. Wind tunnel experiments were conducted to understand not only the relationbetween the building coverage ratio and the coefficient of wind pressure (Cp) but also the relationbetween the roof slope of a residence and Cp value. To simulate an urban area, dummy models wereplaced around a target model, and the building densities were set to 0, 10, 20, and 40%. The roofslopes of residences were set to 0 (flat roof), 15, and 26.7.

The correlation of atmospheric pollution by VOC and NMHC/NOX ratio has been found. By usingNMHC/NOX ratio, the source of NMHC in the region can be presumed without effects from the diffusionand the dilution by the meteorological conditions. At general measurement station in A city OsakaPrefecture, the NMHC/NOX ratio shows high value in summer though NMHC and NOX concentrationshow high value in early winter. As opposed to city A, traffic measurement station C doesnt show thispattern. It suggests that the amount of the exhaust of NMHC increases along with the temperature.