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Interpreting Process Descriptions
What variables to use when
16
Chemical Engineering
Undergraduate 1
02/25/2013

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Cards

Term
What happens if there is a change in Temperature of the System?
Definition
*Changes in Molecular Energy*
Change in molar internal energy (U): enthalpy, entropy, Heat capacity (heat transfer)
Term
Physical mechanical components interacting with the system (effect and examples of these)
Definition
Effects Energy transferred by Work (W)
the transfer of energy due to forces causing motion
piston-cylinder
turbine
expansion/compression
Term
Uninsulated system not at thermal equilibrium with surroundings.
Definition
Effects Energy transferred by Heat (Q)
the transfer of energy due to differences in temperature
Term
You want Maximum Efficiency, think of?
Definition
Reversible Process, Carnot Cycle
Term
Phase Changes occur in water
Definition
Enthalpy, the steam tables, Internal Energy Change
Term
Closed System
Definition
Antoine Equation
Term
Adiabatic Reversible
Definition
delta s is 0
Term
Throttling Devices
Definition
Reduction in pressure of flow streams (P-out > P-in)
Typically Neglect:
-macroscopic kinetic and potential energy
-Heat transfer
-Shaft Work
Term
Turbines
Definition
Generation of Shaft power by fluid flow moving over rotating blades. Shaft work generated by Ek, Ep, and H
Typically Neglect:
-Macroscopic kinetic energy
-Heat transfer
Term
Compressors and Pumps
Definition
Increase of pressure due to shaft work
Typically Neglect:
-Macroscopic kinetic energy
-Heat transfer
Term
Heat Exchangers
Definition
exchange thermal energy between flow streams
Typically Neglect:
-Macroscopic kinetic and potential energy
-Shaft work
Term
Nozzles
Definition
Constrict flow to increase macroscopic kinetic energy . increase in ek balanced by decrease in h
-Typically Neglect:
-Macroscopic potential energy
-Heat transfer
-Shaft work
Term
Diffusers
Definition
Dilate flow to decrease macroscopic kinetic energy
decrease in ek balanced by increase in h
Typically Neglect:
-Macroscopic potential energy
-Heat transfer
-Shaft Work
Term
Reversible adiabatic process involving ideal gas with heat capacities independent of temperature
Definition
Polytropic Process
Term
reversible adiabatic
Definition
entropy in = entropy out
Term
produce the greatest power possible, find the upper limit of power that can be produced
Definition
reversible operation
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