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.

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.

The paper deals with on-site measurements of energy benefits resulting from exploitation of double-skin solar energy façade for pre-heating of ventilating air. The southwards oriented façade with total area of 1135 m2 on a new building of Moravian Library

In this study, the effect of the thermal mass and thermal insulation of a ventilated building onthe indoor environment is investigated. A simplified model of the thermal interaction between a building structure and the interior is developed. Three important parameters are determined, and analytic expressions for the attenuation and phase lag of harmonic external forcing are derived for an unventilated interior. The effect of forced or stack-driven natural ventilation on the interior response is then investigated.

Double-skin façades (DSF) are widely used as an architectural solution to both control the thermal behaviour and allow for the possibility of using natural ventilation techniques on buildings. DSF are characterized by having at least two membranes between

As particles in room air can cause lung diseases, it is important to study how they are transported and dispersed in buildings. This investigation numerically studied particle dispersion by using the Lagrangian approach. The turbulent airflow is solved by the RNG k-e model; and a discontinuous random walk (DRW) model is applied to account for the stochastic effect of particle movement in turbulent flow. The computed results agree reasonably well with the experimental data for particle dispersion in a wind tunnel.

This paper introduces a simple method for a natural ventilation strategic design and the evaluation of ventilation effectiveness. A simplified integrated dynamic thermal and air flow model has been developed for natural ventilation building design at the early stage. This analytic method can perform parametric studies and an optimum opening design. The indices of overheating day and ventilation sufficiency have been proposed to evaluate the ventilation effectiveness. Computer program can perform dynamic simulation for the proposed design.

Fläkt Woods, which manufactures a wide range of ventilation equipment, has undertaken a programme of experimental verification of the concepts of new displacement ventilation equipment, as well as validation of a CFD (Computational Fluid Dynamics) package

The accumulation of heat, contaminant and water vapour into the upper part of rooms is utilized in stratification and zoning room air conditioning strategies. For the zoning strategy the plume penetration through the supply air jet is an essential parameter in modelling the temperature, concentration and humidity in the lower and upper zones of the room. This paper presents an analytical method for modelling the plume penetration for an air distribution method based on horizontal inclined jets of industrial grilles.

The mean velocity in rooms predicted by CFD simulations based on RANS equations differs from the mean (in time) magnitude of the velocity, i.e. the mean speed, in rooms measured by low velocity thermal anemometers with omnidirectional sensor. This discrepancy results in incorrect thermal comfort assessment by the CFD predictions as well as incorrect validation of the predicted velocity field. In this paper the discrepancies are discussed and identified, and a method for estimating the mean speed based on the CFD predictions of mean velocity and kinetic turbulence energy is suggested.