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Bicycles are generally rated as being very efficient, in the 95-98% range.
Between producer and secondary consumers very little energy is lost to heat and waste. More energy is lost by keeping the organism alive than is lost to the environment.
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The heat of rejection, also known as just heat rejection, is when heat leaves a system. How much heat is lost depends on the system and its functionality.
Combustion engines make power by burning fuel. Much of that energy is lost to heat.
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They may die or get a heat stroke.
Energy is lost as heat. A typical nuclear power plant produces about twice as much energy as waste heat as it does in electricity. Other power plants are not much better, except for such things as more modern gas plants, which can used combined cycle to recover some of the lost heat (nuclear could too) and even do cogeneration use more waste heat to heat buildings (which nuclear plants probably cannot).
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90%
You ARE going to lose heat up the chimney. Couple of things you can do to keep SOME of it in the room. Got a set of doors for the fireplace? They need to be open while burning, but can be closed as fire goes out, keep from sucking warm air out of the room. There are heat exchangers that are metal tubes with a fan. Tubes heated by the fire, fan pushes air thru the tubes, out into the room. The "Heatilator" style fireplaces have a heat exchanger built in to the fireplace. The heat exchangers are not cheap, and are still not as efficient as a wood stove.
The price of chimney repair changes with area. Recently I have hired A1 Chimney Sweep - Allen for Chimney Repair in Allen. They are very affordable in prices and done very good work of Chimney Repair.