lately in Australia we've had extremely hot days, high 40s Celsius in multiple cities.... the power grid really struggled to handle the pressure, train track literally buckled and the best authorities could do was say people should turn off their DVD players. Surely there must be a way to harness such hot weather for power generation? Would a solar station that uses mirrors to heat water do better in these conditions or only marginally?
Generally, in order to generate usable power from heat you need something cold too. The power generated by a device (such as a stirling engine) is generated due to the difference in temperature between the hold and cold sides. The cold gets heated in the process.
Once you reach about 5 meters below the surface (underground) then, the temperature is the average of the year's temperature. Making a device, such as a stirling engine, running from this far below ground to the surface would generate some power when the temperature is much different than the average, but not much.
Generating electricity solely from atmospheric (around us) heat is like a holy grail of energy production. The device would just cool the air (taking its heat) and give us usable power. We can do it at over 1,500 degrees kelvin (with a "Thermonic Converter", but that's hardly atmospheric temperature.
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