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A solar air heater with the air flow channel underneath the absorber plate has been designed and tested. The performance tests have been carried out when the flow channel is empty (type I) and packed with Raschig rings made of hard plastic (type II). The packing causes a considerable increase in the efficiency. The theoretical analysis of the systems has been performed using a heat transfer model based on the quasi-steady state condition. The energy balance equations of the systems with one and two glass covers have been solved explicitly for various design and operating variables. The agreement between the measured and predicted performances is satisfactory for the type I, while it is relatively poor for the type II.
The plane strain elastic-plastic state at a crack tip is determined for compact tension, bend, double edge-cracked and centre-cracked specimens using a finite element method with triangular constant-strain elements. The solutions are found to differ by 10 to 30 per cent at the ASTM-limit as regards fracture surface displacement, normal stress and plastic zone size. In order to bring the boundary layer solution for the crack problem into agreement with the solution for a specific specimen one has to modify this solution. The modification consists of an addition to the boundary Roshe5416-Shoes Men Nike Roshe Run Green Black tractions for the boundary layer problem of tractions corresponding to the non-singular, constant second term in Roshe1258-Shoes Roshe Trainers Men Dark Blue Green a series expansion of the normal stress parallel to the crack plane.