Energy Transfer
Energy Transfer
Energy Transfer
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First Law: Statement• Heat input to a system minus work output by thesystem is equal to the change in the energy of thesystem. A negative quantity for Q or W simply meansthat the assumed direction for that quantity is wrong.• Various forms of this “traditional” first law relation forclosed systems are given as1. General Q – W = E2. Stationary systems Q – W = U3. Per unit mass q – w = e4. Differential form q - w = de<strong>Energy</strong> <strong>Transfer</strong> 35© Copyright 2005 Prof. Arun S. Mujumdar.
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