English

This paper considers methodologies how desired level, target level, of industrial air quality can be defined taking into account a feasibility issue. The method is based on the health-based risk assessment and the technology-based approach. Because health-based risk estimates at low contaminant concentration regions are rather inaccurate, the technology-based approach is emphasized. The technological approach is based on information on the prevailing contaminant concentrations in industrial work environment and the benchmark air quality attained with the best achievable control technology.

A new ventilated cooledbeam system concept with free cooling has been installed and monitored in a retrofitted office building in the Wartsila NSD Finland complex in Vaasa, Finland. Good indoor air quality and individual room temperature control has been achieved using ventilated cooled beams. Both cooling- and supplyair distribution functions were integrated in the same room unit. No extra costs were incurred for the low-energy system's freecooling loop.

An interconnection between a building energy performance simulation program and a Computational Fluid Dynamics program (CFD) for room air distribution will be introduced for improvement of the predictions of both the energy consumption and the indoor environment. The building energy performance simulation program requires a detailed description of the energy flow in the air movement which can be obtained by a CFD program.

The paper presents some of the findings from a broader investigation aimed at determining thermal comfort design conditions for combined chilled ceiling/ displacement ventilation environments. A typical chilled ceiling/ displacement ventilation office has been created within a laboratory test room, in which the ceiling temperature can be varied over a range of typical operating values; the thermal comfort of eight female test subjects was then measured in the test room over the range of ceiling temperatures.

In the unsteady calculations of room thermal environments, two simple and effective methods were introduced to reduce computer efforts through two case studies. One method (method-A) was applied to a passive solar room analysis (caseA) and another method( method-B) was applied to estimation of energy consumption in an air-conditioned room (caseB). In method-A, flow fields are calculated intermittently, namely, calculated every Nta time step while temperature fields are calculated every time step here, Nta≥ 1.

The paper discusses the performance or a construction element: the Roof Solar Collector (RSC) with regard to the rate of induced natural ventilation which contribute to improve houses indoor thermal comfort. The RSC configuration was made by using modern materials: CPAC monier concrete tiles on the outer side and gypsum board on the inner one. The comparison of numerical results with available experimental data validated the developed model. The effect or RSC parameters mainly, tilt angle and length was analyzed numerically. Finally, a new configuration of RSC was proposed

MCA is a partner in a research group which is being funded by the European Commissions JOULE program to explore the application of passive downdraught evaporative cooling (PDEC) in non-domestic buildings (I). As part of MCA's task to design a full scale experimental building, special components were designed to catch the wind and distribute through the building spaces. To determine the most efficient form for these components, a series of wind tunnel tests was undertaken at the University of Ancona, Italy.