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Solar Thermal Photovoltaics
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How hot can the tubes get? These photos show a digital thermometer with its thermocouple attached to the heat pipe bulb of a 58mm tube fixed to the roof a stall at a local green fair. It took about an hour to reach this temperature, and reached a maximum of 234°C later in the day. It would go a little higher with more insulation around the thermocouple. The temperature on the outside of the glass tube was only at the ambient temperature (it was about 22°C that day) showing the efficiency of the vacuum insulation.
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