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Solved: Refrigerant 22 enters the compressor of an ideal

Fundamentals of Engineering Thermodynamics | 8th Edition | ISBN: 9781118412930 | Authors: Michael J. Moran ISBN: 9781118412930 139

Solution for problem 10.10 Chapter 10

Fundamentals of Engineering Thermodynamics | 8th Edition

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Fundamentals of Engineering Thermodynamics | 8th Edition | ISBN: 9781118412930 | Authors: Michael J. Moran

Fundamentals of Engineering Thermodynamics | 8th Edition

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Problem 10.10

Refrigerant 22 enters the compressor of an ideal vaporcompression refrigeration system as saturated vapor at 2408C with a volumetric flow rate of 15 m3 /min. The refrigerant leaves the condenser at 198C, 9 bar. Determine (a) the compressor power, in kW. (b) the refrigerating capacity, in tons. (c) the coefficient of performance. (d) the rate of entropy production for the cycle, in kW/K.

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Chapter 15 Part 2:  The Steady State Approximation: o Two limiting cases:  Low pressure: When [M] is small, k2>k2[M] and rate is 2ndorder  High pressure: When [M] is large, k1[M]>k2 and rate is 1 order  Intermediates follow pseudo first-order kinetics  Effects of temperature on reaction rates: o Many reactions increase rapidly with T  Increase T by 10 degrees, rate doubles o Arrhenius equation states that rate constants depend exponentially on temperature. o k=Ae^-Ea/RT o lnk=lnA-Ea/RT o When plotted with y axis lnk and x axis 1/T, the slope is a negative linear one o Strong temperature dependence of reaction rates can be related to Maxwell-Boltzmann distribution of KE.  Fraction of molecules of energies>Ea  Potential energy surface (PES): Interaction of reactants described by a potential energy surface  Reactants approach on a reaction path.  Activation energy for forward reaction: Ea,f  Activation energy for reverse reaction: Ea,r  Change in internal energy for reaction: DeltaE=Ea,f- Ea,r  Elementary reactions always increase with temperature since activation energy for elementary reactions is always positive  Kinetics of Catalysis: o Catalysts are substances that are part of a chemical reaction and speed it up, but there’s no permanent chemical change in itself.  They modify pathways or provide new pathways for reaction  They speed up reactions by increasing the Arrhenius factor A, or lowering the activation energy Ea  Have no effect on thermodynaimcs  Two types: homogenous and heterogeneous  Heterogeneous catalyst: one present in a distinct phase  Ex. A solid surface in a solution-phase reaction  Homogenous catalyst: Not present in distinct phase  Ex. Chlorofluorohydrocarbons and nitrogen oxides in depletion of stratospheric ozone, and catalysis of the oxidation-reduction reaction by silver ions in solution  Inhibitors slow reactions by increasing Ea  Enzymes are large catalytic protein molecules, and reactions occur by binding of a substrate to the active site of the enzyme. o Most chemical reactions in living systems carried out with enzymes.

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Textbook: Fundamentals of Engineering Thermodynamics
Edition: 8
Author: Michael J. Moran
ISBN: 9781118412930

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Solved: Refrigerant 22 enters the compressor of an ideal