A THEORETICAL STUDY OF LAMINAR FREE CONVECTION THROUGH  POROUS  TROMBE WALL WITH PASSIVE SOLAR ENERGY

	A THEORETICAL STUDY OF LAMINAR FREE CONVECTION THROUGH POROUS TROMBE WALL WITH PASSIVE SOLAR ENERGY
AL-TAQANI
Article 1, Volume 21, Issue 1, 2008, Pages 140-150
Abstract
Solar energy has become an important source nowadays for reducing energy especially in winter ,and trombe wall is considered one of the most important applications of solar energy in heating . In this study porous wall container is selected , full of gravel with gaps below the wall to allow inter cold air to enter and upper gaps of the wall to exit hot air . A mathematical model has been formulated with computer program to simulate this model using the central finite differences to solve the partial differential equations and the results are compared with concrete wall and show that porous wall with gaps has solar heat fraction larger than concrete wall , therefore it is the better in heat storing , this leads to reduce the added auxiliary energy . The non-dimensional temperature and velocity represents together with wall width for time limited with respect to Darcy model for flowing , and Nusselt number acts along with flow line showing the decrease in Nusselt number as a result of the growth in thermal boundary layer .

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