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I have constructed a ground radiator.

A project log for Geothermal Energy Harvesting Garden Lights

use the natural, stable temperature of the ground to power garden lights and sensors via a thermoelectric device

Trey CoreTrey Core 07/09/2018 at 03:030 Comments

I made a radiator out of scrap steel. This radiator will conduct heat into the ground to create a temperature differential for the thermoelectric device. The radiator is about 14 inches long and is make from two lengths of "angle iron".  A cross section of the radiator is 2 inches long.  At the top of the radiator is a flat square piece that the TEG will sit on. 

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