Waleed Abdelmaksoud

Personal Ventilation and Displacement Ventilation Assessment in Cubicle Workstations

Personal ventilation (PV) strategy is increasing very rapidly in ventilating the indoor spaces. Compared to the traditional ventilation system, the use of PV system can provide several advantages such as: energy reduction, comfort and healthy environment. Previous study reported in earlier paper [Schiavon et al. 2010] indicated that the use of PV system may reduce the energy consumption substantially (up to 51%) compared to mixing ventilation. Additionally, healthy environment is assured in the PV system due to the direct supply of fresh “clean” air to the occupant face. In the current study, detailed assessment of PV system and displacement ventilation (DV) system in a cubicle workstation (office cubicle) is presented. This assessment is based on CFD simulations. Five ventilation cases have been studied on the office cubicle. One case is performing a DV system only; another is performing a PV system only; the remaining three cases are performing a combined of PV and DV system. These cases have been evaluated using the PMV and PPD comfort indices, developed by Fanger 1970 and 1982. The target was to achieve a ventilation case that satisfies the best comfort indices near the occupant in the office cubicle. The five cases conditions and the best case conditions are presented in this paper.Copyright

Numerical Investigations of the Air Flow Patterns and Temperature Distribution in a Museum Showroom, King Tutankhamun’s Gallery, Egyptian Museum

The use of numerical simulation methods for the Cultural Heritage is of increasing importance for the analysis, conservation, restoration and appreciation of works of art. This is particularly important when their preservation and planned maintenance is the primary aim [1, 2]. King Tutankhamen’s gallery at the Egyptian museum is chosen for our study. The conservation of such artworks requires precise control of the indoor microclimatic conditions. Thus, a suitable HVAC system with reliable control is often necessary for a museum, to maintain acceptable indoor thermal-hygrometric parameters and air velocity and also to minimize the deviations of these parameters from the design values. An investigation of airflow characteristics inside King Tutankhamen’s gallery at the Egyptian museum is studied. The effect of visitors within the gallery space is discussed. Lighting is mainly neglected and its effect is shown in a limited procedure. The variability of inlet air velocities and the grills location in the gallery is studied to achieve a better understanding of the closest solution for air distribution within the gallery.Copyright