John T - FYI

Posted by nballen on July 06, 2006 at 09:04:56 from (198.246.171.252):

In Reply to: Re: PT 2 would like your input on alternative fuel posted by John T on July 06, 2006 at 06:41:43:

Enthalpy - stored energy (chemical potential, temperature, potential energy) plus "flow work" (in a fluid system, the absolute pressure multiplied by the volume per unit mass).

Entropy - measure of disorder in a system, also referred to as "unavailable energy" in the system.

1st Law of Thermodynamics (Conservation of Energy) - Basically, "Energy can neither be created, nor destroyed. Energy can be converted, transferred, used, and stored."

2nd Law of Thermodynamics - from the _Fundamentals of Engineering, 9th ed._ "A device cannot operate in a cycle and produce work output while exchanging heat with a single constant temperature reservoir."
In English - In order for heat to be transferred (and work to be produced), there must be a temperature difference or an external energy source (no longer a closed system).

Replies:

• Re: John T - FYI John T 15:18:26 07/06/06 (0)

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