Solar energy subsystems employing isothermal hear sink materials. Semi-annual progress report, Sepember 18, 1974--June 31, 1975

A group of over 200 potential phase change heat storage materials, melting from 10 to 90/sup 0/C was identified. Laboratory tests narrowed these to materials recommended for hot faucet water, hydronic heating, forced air heating, heat pump application, radiant wall panels, and stored cold systems. Several encapsulation methods were studied: micro-encapsulation, encapsulation of powders and granules, and macro-encapsulation. Micro-encapsulation of CaCl/sub 2/.6H/sub 2/O in polyester resin has been successful, and development of wall, floor, and ceiling panels is under way. Macro-encapsulation in plastic film containers appears promising for hot air systems.