Explanation Express the minimum power required by the compressor. W ˙ rev,in = m ˙ [ h 2 − h 1 − T 0 ( s 2 − s 1 ) ] (I) Here, mass flow rate is m ˙ , initial and final specific enthalpy is h 1 and h 2 respectively, surrounding temperature is T 0 and initial and final specific entropy is s 1 and s 2 respectively. Conclusion: Perform the unit conversion of temperature from ° F to R . T 1 = 60 ° F = ( 60 + 460 ) R = 520 R T 2 = 480 ° F = ( 480 + 460 ) R = 940 R Refer Table A-17E, “ideal gas properties of air ” and write the properties corresponding to initial temperature ( T 1 ) of 520 R as. h 1 = 124.27 Btu / lbm s 1 = 0.59173 Btu / lbm ⋅ R Here, specific enthalpy and entropy at saturated vapor is h g and s g respectively. Refer Table A-17E, “ideal gas properties of air” and write the properties corresponding to initial temperature ( T 1 ) of 940 R as. h 2 = 226.11 Btu / lbm s 2 = 0

8th Edition

ISBN: 9781307434316

Author: CENGEL

Publisher: INTER MCG

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Chapter 8.8, Problem 56P

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The minimum power required by the compressor.

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Chapter 8.8, Problem 55P

Chapter 8.8, Problem 57P

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Homework#8

Box A has a mass of 15 kilograms and is attached to the 20 kilogram Box B using the cord and pulley system shown. The coefficient of kinetic friction between the boxes and surface is 0.2 and the moment of inertia of the pulley is 0.5 kg * m^ 2. After 2 seconds, how far do the boxes move? A бро B

Box A has a mass of 15 kilograms and is attached to the 20 kilogram Box B using the cord and pulley system shown. The coefficient of kinetic friction between the boxes and surface is 0.2 and the moment of inertia of the pulley is 0.5 kg * m^2. Both boxes are 0.25 m long and 0.25 m high. The cord is attached to the bottom of Box A and the middle of box B. After 2 seconds, how far do the boxes move? A From бро B

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THERMODYNAMICS(SI UNITS,INTL.ED)EBOOK>I

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