Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Demonstrate how enthalpies 1, 2, and 3 were determined.  

Example 8.3-5 process. Energy Balance on a Gas Preheater A stream containing 10% CH4 and 90% air by volume is to be heated from 20°C to 300°C. Calculate the required rate of heat input in kilowatts if the flow rate of the gas is 2.00 x 10 liters (STP)/min. Solution Basis: Given Flow Rate Assume ideal-gas behavior. 2000 L (STP)/min, 20°C (mol/min) 0.100 mol CH₂/mol 0.900 mol air/mol Q Search n = 2000 L (STP) min Recall that specifying the flow rate in liters (STP)/min_does not imply that the feed gas is at standard temperature and pressure; it is simply an alternative way of giving the molar flow rate. HEATER 26 Q(kW) D 8.3 Changes in Temperature 421 1 mol 22.4L (STP) n(mol/min), 300°C 0.100 mol CH₂/mol 0.900 mol air/mol The energy balance with kinetic and potential energy changes and shaft workfomitted is O=AH. The task is to evaluate AH = nH₁-nH₁. Since each species has only one inlet condition and one outlet Σ out in condition in the process, two rows are sufficient for the enthalpy table. = 89.3 mol/min D C e ^ENG
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Transcribed Image Text:Example 8.3-5 process. Energy Balance on a Gas Preheater A stream containing 10% CH4 and 90% air by volume is to be heated from 20°C to 300°C. Calculate the required rate of heat input in kilowatts if the flow rate of the gas is 2.00 x 10 liters (STP)/min. Solution Basis: Given Flow Rate Assume ideal-gas behavior. 2000 L (STP)/min, 20°C (mol/min) 0.100 mol CH₂/mol 0.900 mol air/mol Q Search n = 2000 L (STP) min Recall that specifying the flow rate in liters (STP)/min_does not imply that the feed gas is at standard temperature and pressure; it is simply an alternative way of giving the molar flow rate. HEATER 26 Q(kW) D 8.3 Changes in Temperature 421 1 mol 22.4L (STP) n(mol/min), 300°C 0.100 mol CH₂/mol 0.900 mol air/mol The energy balance with kinetic and potential energy changes and shaft workfomitted is O=AH. The task is to evaluate AH = nH₁-nH₁. Since each species has only one inlet condition and one outlet Σ out in condition in the process, two rows are sufficient for the enthalpy table. = 89.3 mol/min D C e ^ENG
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