CHEN 3102 Lecture Notes - Lecture 48: Heat Transfer Coefficient, Kinetic Energy, Potential Energy
4 Apr 2015
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Reators typically have integrated heat transfer example: naptho cracking (endothermic, noncatalytic --> happens @ higher t) Naptho + h2o combustion (600 - 800 oc) There"s a bunch of tubes in the box. Cracked product (c2h4, c3h6) naptho = middle portion of petroleummoderate sized. The heat or work can be in or out of the system. In an energy balance, account for all of the terms the 3rd and 4th term are the enthalpies of the mass flowing in and out. Kinetic energy is frequently negligible (unless something like a jet) something can be jet-like too (like some agricultural processes) (happens when have shear, something going through nozzle) Tout has to be the same temperature as the mixture inside the reactor. Mass balance: accumulation = in - out + gen. Energy balance: accumulation = flow in - flow out + gen + heat transfer through wall - shaf twork.
