English

Data linking poor IAQ in the classrooms to student performance is limited. This study explores the student performance on standardized aptitude tests that are administered to students on a yearly basis,in parallel with classroom carbon dioxide concentrations. Data on classroom conditions and carbon dioxide concentrations (were recorded in 5th grade classrooms in fifty four schools within a Midwestern school district in the USA. Preliminary results are presented in the paper.

A draft perception study of Displacement Ventilation (DV) system in a Field Environmental Chamber (FEC) with tropically acclimatized subjects is presented in this paper.60 subjects, 30 males and 30 females, were exposed to 3 vertical air temperature gradients, and 3 room air temperatures, for a 3 hour-period. Room air temperature had greater impact on percentage unsatisfied due to air movement than temperature gradient.

Subjective experiments were conducted to investigate the effect of three different types of Task air-conditioning systems (3DU+, PEM, and TU) on thermal comfort in a climate chamber - conditioned at 28C/50%RH with task systems and 26C/50%RH without them.- It was found that these systems were effective in providing thermal comfort.

How much do we really know about ventilation ?It is admitted that for a good indoor air quality in a building, the amount of outdoor air ventilation is one of the most important determinants , but many critical questions and misunderstandings exist :Do we know the quantity of outdoor air is even needed in buildings? And about the ventilation requirements : they treat all the huge variability in buildings the same.

The design of "simple" ventilation systems in compliance with Standard 62-2001 Addentum 62n requirements has already been discussed in articles. This paper focuses mainly on the design of a more complex set of ventilation systems, namely single-path multiple-zone recirculating systems.The calculation procedures to reduce both underventilation and unnecessary over-ventilation are clarified and help for determining system ventilation efficiency.

The trial implementation of hybrid ventilation systems in dwelling buildings, done in the scope of the EU LIFE Programme supported project ECOVENTis the aim of that paper. In that end, systems performance have been monitored during full calendar year to show the possibility of that system use in Latvian climate conditions .
The paper gives theoretical working modes of the ideal hybrid ventilation system, describes advantages and drawbacks of the ventilation systems selected for the trial implementation.

Within the European research project HOPE, office and residential buildings were investigated using checklists addressing the building characteristics . the occupants were asked to fulfill questionnaires about their perceived comfort (thermal visual, acoustical and IAQ) and health (SBS and allergies).
The analysis of the collected data, along with experience obtaied from former projects and literature allows the presentation of guidelines for creating healthy and energy-efficient buildings.

Within the European research project HOPE, office and residential buildings were investigated using checklists addressing the building characteristics . the occupants were asked to fulfill questionnaires about their perceived comfort (thermal visual, acoustical and IAQ) and health (SBS and allergies).
The collected data are compared looking for correlations between building characteristics on one hand, and perceived comfort and health on the other hand.

This study deals with the indoor air quality in five mechanically ventilated and four naturally ventilated open-plan office buildings in Copenhagen along with their occupants satisfaction. A simplified assessment procedure has been used for that study..
The results indicate that occupants in naturally ventilated offices have a lower prevalence of symptoms and are more satisfied than those in mechanically ventilated offices

The aim of that study was to clarify the differences in airflow characteristics outside and at three points in a cross-ventilated room under six opening conditions: window-open; insect-screen; lace-curtain; fabric-curtain; combined condition with insect-screen and lace-curtain; and combined condition with insect-screen, lace-curtain and fabric-curtain. The air velocity was measured by four ultrasonic anemometers, during the summer of 2004. The results obtained are presented.