Computer Model of Thermal Energy Storage as a Result of a Phase Change for Use in Solar Heating
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The purpose of this research was to develop a model thermal storage system that included a phase change. A heat transfer computer program, TAP-A was developed by the Astro nuclear Laboratory of Westinghouse in 1970. The program allows for arbitrary geometric configurations of multiadimensional systems. The body is segmented into cells, in the center of which are points or nodes. The temperature distribution is calculated by an iterative process, node by node. The program was modified in such a way that upon reaching the melting point, a node is excluded from the iterative process until it has a net heat absorption equal to the product of it's heat of fusion and weight. At this time, the node has melted and is readmitted to the iterative process. The TAP-A code as modified has been transformed from a temperature distribution model into a heat transfer model capable of handling phase changes. Much of the initial work done to the program was to debug it and to get it running on the PDP-II using teletype input and disk storage. This was very time-consuming and frustrating as the bugs were considerable. The PHASE subroutine was added after careful study of the iterative calculations of the implicit method of solution and the many associated arrays PHASE was written in such a way as to use all of the original coding format to insure that it will work with the most complex models.