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In order to study the impact of the outdoor air on the indoor environment, suspended particulate matter were simultaneously sampled indoors and outdoors of a typical residential house in the Al-suwayq area. The resullts showed that the concentration of the indoor suspended particulate matter was heavily dependent on outdoors.The information obtained in this study appears to be the only data for indoor atmospheric dust collected in Oman.

The objective of this paper is to expose the obtained results of ventilation efficiency in thetypical configurations of air extraction in residential buildings and, specifically, in the bathroomscases. Most representative typologies have been analyzed by means of a double study: an experimental model performed in laboratory with tracer gas and photo-acoustics techniques, and a numerical model with CFD software (Computational Fluid Dynamics).That stage, and the experimental validation of the numerical process, has allowed the infographicsimulation of a new and extensive cases variety.

The utilization factor is a relative well-known concept used in some simplified calculationmethods as CEN EN-13790, in this regulation this factor depends on the thermal inertia and the ratioheat gains/ heat losses. In this paper we will define the utilization factor for cooling. The present paper starts analysing the energy stored and released in building components as walls. In this step we will establish a load period and a discharge period. In the load period the component will release heat cool load- while in the discharge period the component will storage heat cool discharge-.

The study was carried out to answer directive 91/2002 of the UE, transcribed in Romaniathrough the law 372/2005, which requires, inter alias, the regular inspection of the installations of airconditioning.Such an inspection requires a coherent system of measurement to characterize its capacity of effective operation. Our work relates to the centralized installations of air-conditioning and those decentralized, with ventilo-convectors.

Thermal comfort very frequently affects thermal sensation in such a hot environment as Libya. The inside temperature and surface temperature of walls sometimes reach the 35-40C in summer therefore, a warm asymmetrical radiation is simulated and airflow and good insulated are used against this effect, possibly leading again to an unpleasant thermal feeling. The questions are :the temperature and direction of the airflow can solve these problems.

The ISO 7730: 2005 introduces three classes of thermal environments (labelled A, B, C) as afunction of the PMV range value gradually decreasing according to the need of a lower dissatisfiedpercentage. On this point of view, for the A class, requiring severe comfort restrictions, the PMVrange between -0,20 and +0,20 such as the criteria inspiring the prEN 15251 Standard has beenarranged.It is noteworthy that the PMV value evaluated for a certain environment is strongly affected by thechanges of its independent variables (i.e.

Abstract Buildings equipped with state of the art heating/cooling systems and their energeticoptimization require air and radiation temperature value pairs set by controls so, that the value pairsfall within a range considered as comfortable. Many diagrams have been published in the literature,dimensions and shape of the areas are significantly different neither the basic principle of theirdrawing up is described, therefore it is necessary to develop a diagram of temperature comfort rangeon a scientific basis.

The results of an interdisciplinary investigation of the thermal environment and the space heating in 20 low-energy terraced houses are presented in this paper. In that aim, measurements of physical parameters have benn conducted along with qualitative interviews with the occupants. Outcomes of that investigation are presented.

Gaussian-type dispersion models are currently used in most local authorities in UK, for the prediction of the air quality in urban areas. But this study assesses the suitability of the general CFD code (Phoenics) to be used in integrated urban air quality modelling for regulatory purposes. In the city centre of Glasgow, a urban air quality model has been developed by integrating traffic flow date, traffic pollutant emission date, and a 3D CFD dispersion model of a complex configuration of street canyons.

The aim of this paper is to study the interactive phenomena in buoancy-induced natural ventilation in a full-scale enclosure , with upper and lower openings on one of the sidewalls. Experiments reveal the interaction between the mixing and the displacement ventilation with the opening of the lower vent to different heights while the upper vent is kept fully open. The experiments are in agreement with a previous theoretical model.