CHEMENG 3A04 Lecture 1: ChE 3A04 L1
24 Jan 2016
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Document Summary
What is heat transfer? (cid:1) there are three principal laws upon which engineering studies are derived: Conservation of energy (cid:1) thermodynamics the study of the transfer of work and heat between a system and its surroundings in equilibrium. key thermodynamic functions (enthalpy, entropy) are state functions neither rate or pathway influence values (cid:1) how we achieved equilibrium is not of concern in thermodynamics. But is important for designing heating or cooling devices (cid:1) heat transfer determination of the rate of energy transferred from one place to another resulting in a temperature change. Consider a can of cola you want to cool down in a refrigerator. At steady state, we know between the system (can) and surroundings (refrigerator) We have a can (closed system), filled with 355 ml (~355g) of (mostly) water (+ 39 g of sugar!) Internal energy is the sum of sensible (molecular spin, translation, vibration, etc.
