PR2007

In temperate continental climates, the reduction of the solar radiation influence in summer season, over the comfort conditions of internal spaces, can only be achieved by natural means in two ways: one possibility is through occupants adjustments of themselves (clothing,activity, metabolism) and the second possibility is through occupants control of the energy flows (heat, light, sound) in-out the building (management of the envelope).

In this article, the first part of a research project about the modelling of a solar chimney is presented. In this first part, the average ventilation flows measured in an experimentalinstallation have been compared to the results obtained by CFD (Computational Fluid Dynamics) simulations.In order to do so, a solar chimney with a cross-section of 0.78 m x 0.156 m, height 3.6 m, has been constructed.The chimney consists of a glass surface oriented towardsthe south.

In mild climates due to the increase of request of comfortof people there is a growing number of installation of low cost and low efficient cooling system even in new buildings. In designing low energy buildings it necessary nowadays to consider this trend and offer proper solution (envelope and plants) able to reduce the consumption of primary energy.

The aim of the Pythagoras project was the development of an innovative national training material in the sector of indoor environmental quality.The need for education in this specific sector is dictatedby the significant indoor environment deterioration and associated health hazards as these become evident through a series of studies and measurements carried out by the research team.

The performance of natural, mechanical and hybrid ventilation systems was monitored, using the tracer gas decay method, in three typical apartment buildings locatedin two street canyons, during summer period 2002 in Athens. The multi-zone methodology has been adoptedbased on the mass balance of two tracer gases (N2O and SF6) to define the air change rates. The air-exchange efficiency was determined for different ventilation systems,on the basis of the room mean age of air.

To promote the sustainability the building environment is full of opportunities; in particular in Europe with the energy building performance directive and its adaptationin Spain with the new regulation on energy efficiencyin building (Cdigo Tcnico de la Edificacin: CTE). The work on energy efficiency in building could be held since different point of view.

It has been widely recognised that too few projects initiatedunder both national as well as EU funded research projects find their way to commercial exploitation.

It is difficult to design indoor environment under natural ventilation because there is insufficient knowledge to evaluate the effect of the natural ventilation space quantitatively.Especially, natural ventilation rate is not yet fully understood.In this paper, the properties of the naturalventilation with large openings are examined mainlyfrom the measurement result of ventilation rate.

The paper deals with applicability of passive and low energy cooling technologies in the Czech Republic.In the paper there are presented two recent studies, where computer simulation helps to design properly the passive and low energy cooling for buildings is the Czech Republic. There is presented case studies applying,night cooling, thermal mass and slab cooling. The role of computer simulation in the low energy building design and optimalization is discussed.

Research of adaptability to manufacture of application of designs from porous concrete with the help of methodsexpert estimating has shown a high level of adaptabilityto manufacture of the developed decisions in view of factory, transport, assembly, operational adaptability to manufacture and adaptability to manufacture of modernizationand reconstruction. Thus the integrated criterionof adaptability to manufacture is equal 0,665, that promotes increase of general efficiency of process of erection little floors town-planning complexes.