The analytical model described in the first part of the paper is partially validated here by comparing the theoretical results to experimental data collected in a series of model test experiments in an open-jet anechoic wind tunnel. The emphasis is on the validation of the trailing-edge noise model. A comparison is made with existing numerical computations in the literature. The transfer function is found to be roughly invariant with respect to flow conditions encountered on an isolated airfoil. Furthermore, a first application of the model to a cooling fan is presented.

This paper, the first of 2 parts, is dedicated to the analytical modeling of the broadband noise radiated by subsonic fans, such as encountered in HVAC or engine cooling applications. A fan noise prediction scheme is proposed on the basis of single-airfoil linearised unsteady aerodynamics theories. Spanwise distributed sources only are investigated, corresponding to three basic mechanisms, namely the noise from impingement of upstream turbulence, the trailing edge noise associated with turbulent boundary layer scattering, and vortex shedding noise.

This paper is a description of the design process of a new generation low noise axial fan. The emphasis is on the practical use of acoustic knowledge issued from published work and engineer know-how. The use of date issued from numerical simulation is also presented.

The study was carried out on 30 female subjects exposed in a low-polluting office in either presence or absence of personal computers that had been in service for 3 months. Under each of the two conditions, the persons performed simulated office work using low-polluting PCs. They were found to be strong indoor pollution sources, having a negative impact on perceived air quality, on performance of office work and on some SBS symptoms.

The focus of this paper is on cost effectiveness of remedial measures for existing buildings in order to reduce high summer time indoor temperatures. A typical Finnish office building was selected for the analysis. The cost items included in the analysis are: the capital cost of the remedial measure (increase of ventilation, mechanical cooling added in central air handling unit), cost of the used energy (heat and electricity), and the cost of deteriorated productivity due to high temperatures.

This paper presents a comparison of the predicted and measured acoustic system effect induced by a box with a lateral opening at the inlet of an axial flow fan. The objective of this study carried out on an academic configuration, is to develop and validate prediction models for real cases.

In the course of laboratory investigation we examined the adaptability of naive panels onindoor air quality measurements. We made the investigation on a measuring team of 45participants. We examined the measurement precision and standard deviation of themeasuring team with the help of Olf-Box. Our results show that despite the economicefficiency the number of persons in a measuring team cannot be reduced to less than 30subjects. We built a measuring system to examine the emission of indoor used materials.

A minaret of a mosque, traditionally used as a high platform to deliver adhan (the call forprayer), has greatly lost its functional significance with the invention of loudspeakers. Despiteof being a functionally redundant element, people still like to erect a minaret as a traditionalsymbol, identity and beauty of a mosque.

The provision of adequate naturally generated airflow is a vital component of energy-efficienthealthy buildings. Increasing densification in cities of today acts as a dominant influence onthe wind regime, diverting and obstructing natural wind flow to unpredictable levels.Localized air movement is often inadequate and vastly different from regional magnitudes anddirections and cannot be used as the basis of design.

A cross-sectional study was carried out to investigate the prevalence of sick buildingsyndrome (SBS) among the office workers in Mauritius. Data were collected through selfadministeredquestionnaires answered by 384 occupants in 25 randomly selected buildings. Awalk-through investigation and some indoor climate variables were also monitored. All datacollected were analysed using Epi-Info and SPSS softwares. P values less than 0.05 wereconsidered significant.Personal factors such as sex, allergy and active smoking were significantly related to SBSsymptoms.