KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-lec5

KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-lec5

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Stirred-Tank Heating Process Figure 2.3 Stirred-tank heating process with constant holdup, V . Chapter 2
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Stirred-Tank Heating Process (cont’d.) Assumptions: 1. Perfect mixing; thus, the exit temperature T is also the temperature of the tank contents. 2. The liquid holdup V is constant because the inlet and outlet flow rates are equal. 3. The density and heat capacity C of the liquid are assumed to be constant. Thus, their temperature dependence is neglected. 4. Heat losses are negligible. ρ Chapter 2
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is appropriate to make two assumptions: 1. Changes in potential energy and kinetic energy can be neglected because they are small in comparison with changes in internal energy. 2. The net rate of work can be neglected because it is small compared to the rates of heat transfer and convection. For these reasonable assumptions, the energy balance in Eq. 2-8 can be written as ( 29 int (2-10) dU wH Q dt = -∆ + ) int the internal energy of the system enthalpy per unit mass mass flow rate rate of heat transfer to the system U H w Q = = = = ) ( 29 denotes the difference between outlet and inlet conditions of the flowing
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This note was uploaded on 09/22/2009 for the course CHEMICAL CHE 401 taught by Professor Dr.muhammadal-arfaj during the Spring '09 term at King Fahd University of Petroleum & Minerals.

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KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-lec5

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