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Mechanical Engineering


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  1. I'm a retired engineer with a different approach to thermodynamics. Suppose we redefine some terms in thermodynamics based on the following statements: 1. All energy has two components: work energy and heat energy 2. Work is the change in work energy which is equal to the energy available to do work. 3 Heat is the change in heat energy which is equal to the energy unavailable to do work. 4 Work can create heat but heat can not create work. Next is to establish a common sense sign convention: (-) = energy removed or energy released (+) = energy added or energy absorbed First law of thermodynamics Change in energy HOT (-) + COLD (+) = zero Energy release from the hot container is absorbed by the cold container Second law of thermodynamics Change in work energy released by HOT (-) is greater than the change work energy added to COLD (+) Change in heat energy released by HOT (-) is less than the change heat energy added to COLD (+) Another example of this is the constant enthalpy process. (throttling) During this process the available energy to do work is converted to energy unavailable to work (heat). If interested in this approach please read my free book titled "Weber's Thermodynamics Notes" www.wrenchtime.com/booksarticles/bookthermodynamics.html Fred www.wrenchtime.com
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