The need for energy efficient buildings is outlined, and the principal issues relating to commercial developments are discussed. The importance of natural cooling is highlighted, and the associated principle are examined. Some ways in which this can be achieved in conventional steel framed construction are presented. The suggestions include passive systems which rely simply on exposing sufficient thermal capacity of the building fabric, and active systems which provide greater control and improved performance. They represent an application of technology for sustainable development.

A renovation of a dwelling stock in Slovak republic primary mission is a dwelling environment quality increase and dwelling houses essential operative energetical claims  decrease. Considerable means of an operative energetical claims decrease of these buildings is their airiness reduction, that leads to an infiltration air change under level of sanitariness needful. A heat consumption for ventilation optimalisation beside a collateral dwelling environment quality increase is possible to reach through a controlled ventilation systems applications.

Heat requirements of ventilation systems are becoming a dominant factor to be considered in energy balances prepared for residential buildings. This results from a consistent improvement of thermal insulating power and better tightness of partitions, as well as from the standards that ventilation systems have to meet in relation to the quality of the indoor air. This factor despite variable volumes of the air exchanged with the external environment, is not always considered in most estimates of thermal power quantities.

This paper deals with the simulation of VOCs concentration dispersion emitted from flooring material, with the purpose of understanding vocs emission and dispersion mechanisms. A test chamber is examined, whose flooring material emits a number of VOCs. Given the area specific ventilation rate and considering as boundary conditions experimental data for the examined compounds concentration, the dispersion of the vocs concentrations is examined, for two cases, steady state conditions and transient state conditions.

For state of the art buildings ventilation heat loss can exceed 50 percent of the total heat loss of the building. Balanced ventilation systems with heat recovery from the exhaust air lead to bjg costs for ducts. Alternatively, the incoming air of exhaust ventilation systems can be pre-heated by curtain wall facades. A newly developed simulation program for transient analysis of curtain wall systems is validated by measurements. Parameter studies for pre-heating air with curtain walls are presented. Location, orientation, construction, and geometry are considered.

A systematic analysis of ventilation efficiency of indoor climate in buildings is required. The article gives the strategy of that procedure and individual parameters of thermal environment and indoor air quality that must be taken into account. The discrepancies between the actual and projected values is limited. The same applied to energy use. Besides the analysis of air velocity at analyz ed spot the assessment and evaluation of local air turbulence intensity is necessary as well.