Mechanical energy extracted by the engine is from pressure due to expanding gasses. Delta P Gasses that are already hot and placed into the engine do not expand. In fact they would contract. The pressure increase Delta P in the engine that does work is when you take cold air and heat it. Work is change. Making hot Delta T pressurized air delta P from cold air at atmospheric pressure requires energy. When that hot pressurized air becomes cooler/lower pressure air. It's giving off energy. The losses in conversion is why 60-70% of the heat in the fuel is lost as heat in a typical engine. Really large combined cycle gas turbines, reciprocating engines and steam boilers. Are really stretching to achieve 50% efficiency.
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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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