الفهرس | Only 14 pages are availabe for public view |
Abstract In this work a theoretical model has been developed that can be used to simulate the heat and air flow characteristics in a partially divided conditioned spaces. To validate the model, an experimental test rig has been designed and constructed. Both the theoretical and experimental investigations are carried out and compared based on a two dimensional steady flow assumption. The theoretical model is also used to study several applications where both operating conditions and physical parameters are changed. The first application is an office room with single heat source on top of the partition. The second one is represented by two workstations located in the middle; each is represented by a line of operators and their computers and separated by a partition. The third one is represented by two work station in the corners of the room. The air is supplied from the middle of the ceiling and returned from two return outlets of equal distance from the centre of that ceiling. The theoretical results showed that, for all cases, the maximum surface temperature of the highest heat source intensity which is represented by the computer occurs at its far side from the air supply especially at the lower corner of this side. The effect of Reynolds number, Grashof number and mixed convection strength on flow patterns and isotherm contours are investigated. It is observed that the flow patterns as well as the isotherm contours for each workstation are not affected by each other. The forced supply air from its inlet behaves as an air curtain isolating the two parts of the divided zone from each other. This might be helpful in some applications where there is a need to stop the transfer of unpleasant odors and contaminants from one occupied zone to another such as in case of smoking and nonsmoking areas. |