For that study, field measurements of the indoor climate and ventilation performance have been carried out in Estonia in 28 lightweight timber-frame detached houses. Temperature and relative humidity were continuously measured for each house at 1 hour interval over 1 year period. Results and comments are presented.

The paper is a presentation of selected results obtained by questionnaires, measurements and simulations of ventilation processes in typical blocks of flat and office buildings in Silesia. The aim of this study is to present the investigations and to sum up the effects of airtightness and natural ventilation on indoor environment.

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.

We reflect the results and conclusions of a study on the air’s motion in four old Surgery Rooms in a Basque Country (Spain) hospital that were to be reformed. Our purpose was to understand the airflow trajectory in the surgery rooms, to detect the turbule

The passive cooling techniques such as night time cross ventilation is potentially an interesting strategy to provide substantial cooling energy savings in warm climates. Night cooling ventilation efficiency is determined by three main factors: the external air flow rate in the room, the flow pattern and the thermal mass distribution.

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 severe summer climate, the actual trends in building design (imported from northern latitudes) and the rising living standard in Mediterranean countries have promoted a massive and unnecessary use of air conditioning systems. This creates considerable problems at peak load times,
increasing the cost of electricity and disrupting the energy balance in those countries. Consequently,
the energy consumption for cooling of new and existing buildings will become a serious problem in the near future.

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.