In that paper, the effectiveness of ventilation flows is considered from the perspective of buoyancy (or heat) removal from a space.Three new measures of effectiveness are proposed : they are based on the ability of a flow to flush buoyancy from a ventilated space. Their applications are presented.

Based on the previous study by Yang et al., the authors developed a revised model to estimate the potential for natural-ventilation considering both thermal comfort and IAQ issues for buildings in China. That model differs for two aspects : indoor air temperature varies synchronously with the outdoor air rather than staying at a constant value as assumed by Yang & al., and thermal comfort evaluation index is integrated into the model.

This paper presents laboratory-measured performance of seven relatively new and large Fan-Filter Units (FFUs). Their performances are also compared to smaller FFUs previously tested. Wide variations in their energy performance were found, the use of a consistent evaluation method can generate a comparable FFU performance information. Recommendations ofr further investigations to improve energy efficiency of FFU applications are provided too.

For that study, the authors have investigated the steady state natural ventilation of a room heated at the base and consisting of two vents at different levels. In order to establish appropriate ventilation strategies for a room, they explored how the air flow rate and the internal temperature relative to the exterior vary as a function of the vent areas, the heat load and the vents position. It appears that the appropriate ventilation for a room in winter conditions is mixing ventilation, whereas displacement ventilation is more suitable for warmer external exposures.

The experimental results on natural ventilation flow rate enhancement and attic heat gain reduction of a roof solar collector equipped with a radiant barrier are presented in that paper along with investigation, data analysis, comparison with a conventional roof solar configuration, conclusion.

The aim of that paper was to investigate the impact of alternative energy conservation measures on energy requirements in office buildings in hot-humid climates. Different types of HVAC systems were selected and tested in a five-story office building in Saudi Arabia, and different feasible and practical operational energy conservation measures were evaluated using the energy simulation software of Visual DOE 4.0. Conclusions and recommendations are presented.

A systematic approach is required to deal efficiently with thermal-comfort problems in buildings. The aim of that paper is to introduce an approach that allows thermal-comfort problems to be assessed, identified, treated systematically without wasting time and resources.

For that paper, a multiple regression analysis is applied to predict the room mean velocity on the one hand and to determine the most influencing parameters on the velocity, on the other hand. For four different heat source locations, more than 120 experiments were carried out in a test chamber. The influence of the environmental parameters were examined by two methods : a simple and a multiple regression analysis . The conclusions are presented.

The double skin façade proves to be an effective system in energy conservation in residential buildings. The temperature distribution, the thermal performance in the double skin space and its impact on air-conditioning load in rooms have been measured. Th

For that paper, a new ventilation strategy is numerically simulated, this new approach consists in supplying fresh air directly by using high velocity circular air jet without mixing with recirculated air.Different angles of recirculated air diffuser blades, different lengths and directions of protruding fresh air jets are adopted along with different inlet velocities of fresh air to compare the effectiveness and efficiency of that new ventilation strategy numerically.