Conceptual Modeling and Analysis of a Solar Receiver for Thermochemical Hydrogen Generation
A 3-D simulation using STAR-CD was employed for a suggested solar thermal indirect heat transfer receiver here. A criteria used for this design is to obtain a balanced flow rate in all the parallel branches of this proposed receiver to insure the instantaneous heat removed from each pipe should be as close to each other as possible. The approach was to keep the selected pipe size for the parallel connecting pipes the same while varying parametrical the practical available sizes of the headers to try to achieve this result. This was eventually done by observing the centerline magnitude of the velocities at different parallel pipes to make sure the above mentioned dynamic condition is eventually approached. The typical parallel connection tubes were chosen at 0.95cm and the header diameter range was varied from 2.54-5.08 cm varied sequentially from the smaller to the larger size pipes. The total flow rate through the headers was kept constant for all runs. It was found that for a constant diameter of the cross flow tubes there would not be an additional improvement of the flow rate distribution between a header size of 4.44 cm and the next one above it of 5.08 cm.