Advanced Engineering Mathematics: Maple Computer Guide
Advanced Engineering Mathematics: Maple Computer Guide
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A finite-difference, nodal computer simulation has been developed to handle various passive solar components and systems. Mass wall and direct gain systems may be analyzed. Various overhang geometries, thermocirculation heat transfer, variable thermal mass, secondary lumped thermal mass, heat pipes, selective surfaces, night insulation, and thermosyphon systems are options available in the two versions of FREHEAT (1.0 and 2.0). A radiation network can be calculated for internal heat transfer. The program has single zone capacity at present, but various ground coupling coefficients are optional. Various auxiliary heating, venting, and cooling options are available with low and high thermostat set temperatures. Although the program is well-documented, some knowledge of heat transfer is required for modification. A monthly simulation requires roughly 45 CPU seconds on a CYBER 171. The program is presently available from Colorado State University. Results from four example problems are presented. Conclusions point towards the large energy savings obtained from installing an effective night insulation system.