AIVC - Air Infiltration and Ventilation Centre

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An interface of night ventilation and mass structure for passive cooling design strategy in Ghadames traditional dwellings

The effectiveness of night ventilation strategy for residential buildings in the old town of Ghadames has been investigated in this study. Methods of field surveys including observations, temperature measurements and interviews were conducted to determine the characteristic building parameters and strategies including window patterns and space organisation that mostly contributed to achieve an efficient indoor comfort conditions especially at night summer time. Results showed that skylight openings can be a good window pattern for enhancing night ventilation in hot arid climate.

Sleeping thermal environment and bedroom air conditioning in residential buildings in subtropical areas

This paper presents the results of a study on strategies for bedroom air conditioning in HongKong, a typical subtropical city. It reports firstly on a questionnaire survey on the current situations ofsleeping thermal environment and bedroom air conditioning in residential buildings in Hong Kong. This is followed by reporting results of field monitoring of overnight indoor air temperature, relative humidity and indoor CO2 levels in bedrooms in high-rise residences.

Impact of indoor environment on human health - Egyptian experience -

This study is concerned with the impact of indoor environment on the local National health in airconditioned spaces. The present study is carried out in different applications in Egypt. Two differentmethods are utilized in the present study. An experimental measurement program and comprehensive survey are carried out for some air conditioned applications. The numerical methodsare also utilized to simulate applications that represent the effect of indoor environment onoccupancy health using different indoor air quality indices.

Indoor air quality and thermal comfort studies in the tropics: a comparison between under-floor supply and ceiling-based mixing ventilation systems using female subjects

An experimental study was conducted in a field environmental chamber with the aim of comparingceiling-based mixing ventilation (MV) system and under-floor supply system (UF) from the perspectives of indoor air quality and thermal comfort. Six tropically acclimatized female subjects participated in the experiments and they were required to complete a set of questionnaire pertaining to IAQ and thermal sensation every 20 minutes during each exposure of 2 hours.

Demand Control Ventilation, Indoor Air Quality and Energy Conservation Issues in the Tropics

In the light of ever increasing oil prices and rapidly depleting fossil fuel resources, energyconservation strategies in buildings become popular and necessary design goals. However, it is important to note that resulting poor ventilation in the occupied zones at part-load operating conditions or even unanticipated peak-load conditions due to a different occupancy pattern can often lead to major problems associated with poor Indoor Air Quality (IAQ).

Effects of Reported Neurobehavioral Symptoms on Call Center Operator Performance in the Tropics

A 2x2 balanced experiment was carried out in an air-conditioned call center in the Tropics using a blind intervention approach to study the combined effects of temperature and outdoor air supply rate. Twenty-six permanent call center operators participated in the nine-week study. Intensity of headache symptom was significantly reduced with increased outdoor air supply rate at 24.5C (P<0.03). Similar observation at P<0.04 was observed for a principal component (neurobehavioral symptoms and self-assessed productivity) derived from a set of self evaluated symptoms.

Experimental Study of Draft Perception of Tropically Acclimatized Subjects under Personalized Ventilation

A 2x3 series of experimental conditions under ambient room temperature of 26 °C, two Personalised ventilation (PV) supply air temperatures of 20, 23 °C, and three levels of PV air flow rates of 4.5, 7.3, 11.2 L/s/person were conducted using tropically acc

Indoor humidity modeling and evaluation of condensation on interior surfaces

In tropical humid climates, moisture and condensation on walls lead to significant damage of buildings. The purpose of this article is to present a numerical model to improve the prediction of internal humidity in buildings. Thermal simulation codes usually evaluate moisture due only to airflow transfers. The model presented takes into account the moisture transfers between walls and air inside a zone. It allows a forecast of the quantities of liquid condensed on a surface. An experimental comparison is presented to appreciate the improvement of the model.

"SOLVENT": development of a reversible solar screen glazing system

Preliminary experiments with a novel glazing system developed at the Desert Architecture and Urban Planning Unit of Ben-Gurion University of the Negev indicated that it may provide improved visual and thermal performance in buildings with large glazed areas located in sunny regions (hot and cold). In winter, it allows solar space heating but reduces glare, local over-heating and damage to furnishings caused by exposure to direct solar radiation.

Ventilation in a Mosque - an Additional Purpose the Minarets May Serve

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.