Laboratory facilities are known as significant energy consumers. High ventilation rates arerequired for providing safe and comfortable environment as well as optimum operation of theequipment. Air from laboratories involving chemical activity is exhausted to the outdoors andshould be replaced by outside air. Recirculation is not considered a good practice with regard tosafety. Protection of the outside surroundings is an additional environmental challenge.

This case study deals with the renovation project of ventilation system in the Natural Science Building of Tallinn University of Technology, covering the established aims and principles of technical solutions, in general, and results of monitoring. The reconstruction project involved the task of creating a new ventilation system for required indoor climate of laboratories, avoiding dissemination of harmful materials to rooms. In addition, it was required to keep the operations costs approximately at an acceptable level.

This paper discusses the impact of different air distribution strategies on infection control inoperating rooms. The quality of air in an operating room is primarily assessed with regard tohow effective the air distribution strategy is in minimizing the possibility of airborne particlescausing infection to the patient. The ASHRAE Research Transaction paper titled,"Comparison of Operating Room Ventilation Systems in the Protection of Surgical Sites" [1],is reviewed as a starting point.

The current state of building services engineering in the healthcare sector is characterized by ambiguity and prejudice. There is a conflict, with inadequate knowledge of the necessity and effectiveness of ventilation-based protection concepts on the one hand with the associated investment and operating costs if an integral view is adopted and the economics of antibiotic prophylaxis and infection treatment costs on the other.

The main target of this research project was to find technical and industrial hygienic solutionsfor small car body repair shops to reduce worker's exposure to chemicals during the paintingprocess. Worker's exposure to isocyanates and solvents was measured during painting withportable instruments in five car body shops of different ventilation and occupational hygienelevels. Ventilation performance was studied as well. Concentrations of isocyanates were highin the painter's breathing zone when solventbasedpaints were sprayed.

Ventilated ceiling system is an energy-saving replacement ventilation system for maintainingcomfortable working environment in kitchens. The technology was introduced fromGermany, but there have been no clearly determined relationships between their designs in anelectric kitchen and the ventilation design standards and no established design methods.

Research has confirmed that the well-being and the school performance of pupils dependsignificantly on the quality of the luminous environment, which can be achieved throughdaylight utilization. This paper focuses on the impact of different fenestration systems on thevisual comfort achieved in classrooms. Various window locations, clerestories, roof openingsand light shelves were examined with regard to indoor daylight conditions. The study wasconducted as a parametric analysis, in which models incorporating the above-mentionedsystems were generated on the basis of a typical classroom.

In this work, 36 basic schools of Lisbon city, Portugal followed a questionnaire of the ISAAC- International Study of Asthma and Allergies in Childhood Program. The questionnairecontains questions to identify children with respiratory diseases (wheeze, asthma and rhinitis)as well as their nutrition habits, ingested medication, environmental aspects, among others.The questioned children are 5 to 10 years old, and the answers are from June to December2006. The results are from 995 children inquired who have shown 26.7% with wheezingsymptoms, 9.2% with asthma, and 26.2% with rhinitis.

This article is part of a research in progress about comparative study methods for the Brazilian reality using among many other authors, Givoni (1969), Voght and Miller-Chagas (1970), Fanger-ISO(1970), ASHRAE (55-1992), Mahoney (1971), Humphreys (1978) and Olgyay (1962) methods. This research presents the principal concept to be evaluated by the Universal Fuzzy Controlled aiming to establish a reference to determine a possible interference of the acclimatization factor to determine thermal comfort.

We performed a study on the effect of the discharge airflow rate of the ceiling type airconditioneron ventilation performance in the lecture room with the mixing ventilation. Theexperiments and CFD were conducted for analyzing ventilation performance. The concept ofmean air age and indoor CO2 concentration were used for evaluating ventilation performance.We made the CO2 generation model in the simulation and calculated a lot of cases withrespect to the airflow rate of air conditioner and the ventilation flow rate.