EeebeeE
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You might want to rethink that If the above were true, then I could put an Internal combustion engine in a large oven and turn up the heat in the oven and expect work to be produced by the engine; which isn't true.
Examples of heat engines would be a refrigerator and to some extent, a diesel engine, as the heat in a diesel engine starts the combustion of the fuel which in turn causes work to be done.
First of all, I didn't think that. I cited a reference that thought that.
The first part of the Spark Notes description was that a "heat engine is a machine." If the machine is not configured to be powered by external heat, then it won't work, but that doesn't mean the concept is wrong. Also don't be trapped by the notion that engines can only be internal combustion. There are viable external combustion engines (steam engines, Stirling engines) where an oven could conceivably be configured to be the heat source. ICE's are more dominant because they tend to be more efficient.
A refrigerator uses a motor to compress the gas. Not sure it fits the description of "engine" but a diesel engine definitely does.