Skip to main content


Showing posts from August, 2019

Free electrical energy from central heating and water supply

Anyone investigated central heating and water installations as a source for the generation of electricity? I have a 6-10 bar pressure on water coming from the public supply. A drop of 4 bar equals potential energy from a 40m waterfall like Queen Mary Falls, Australia . A lot of wasted energy released in your toilet and other places. How do we make use of all that energy? Central heating is delivered at high pressure and leaves at high pressure after a temperature drop between 30 and 50 degrees. Can we use 1 bar, 2 bar or 3 bar to slow down the hot water and generate electrical energy and extract more heat before return? Let's calculate. If 100 cubic meter of heated water falls 40 meter, how much energy could we theoretically get, although practically unreasonable? Approximately 40*10*(100*1000)J or circa 40 kWh. 40 kWh costs circa DKK 90 in Denmark, or USD 13 ... or the price of a LED light bulb. In the US typical household power consumption is about 11,700 kWh