THERMOL 81 Degree SOLAR ENERGY HEAT STORAGE ROD 6ft. Phase Change/NaSO4 PVC CELL

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Thermol 81 Solar Energy Storage Rod made by PSI Energy Systems in the late 1970s period -- utilizes a PCM for storage of heat- a Phase Change Material which consists of a compounding of Glauber's Salt (NaSO4) that melts and freezes at 81 and 82 degrees Fahrenheit: a most perfect temperature for plants and animals as well as people<br>-- the rod is<br>PVC tubing with crimped ends<br>and measures 3 1/2 in. by 6 foot long// about 33 pounds --<br>-- last two photos show the pile of rods: only one is included with this listing, though you can buy as many as you wish<br>--<br>--<br>they begin to liquify inside at around 70 degrees in the direct sun, and 'sound' about half fluid at 80 degrees - they are all fluid sounding at 90 plus - - some smudging and light soiling/dustiness to the tube<br>--<br>--<br>we are always listing interesting mechanical/scientific items<br>--<br>Free Local pick-up is an option. Out-of-country buyers are welcome, but overseas shipping is more.<br>Each week we post a number of interesting items that have been purchased from Oregon Estate Sales-shipping can be recalculated and combined with multiple purchases-please let me do the calculating for combined shipments before paying.<br>Thank you for visiting our site.