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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 n = HEATER 0110 2000 L (STP) min d(kW) 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. 8.3 Changes in Temperature 421 1 mol 22.4 L (STP) A(mol/min), 300°C 0.100 mol CH₂/mol 0.900 mol air/mol = 89.3 mol/min out The energy balance with kinetic and potential energy changes and shaft workfomitted is Q=AH. The task is to evaluate AH = EhH₁-EhH₁. Since each species has only one inlet condition and one outlet condition in the process, two rows are sufficient for the enthalpy table. in

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 n = HEATER 0110 2000 L (STP) min d(kW) 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. 8.3 Changes in Temperature 421 1 mol 22.4 L (STP) A(mol/min), 300°C 0.100 mol CH₂/mol 0.900 mol air/mol = 89.3 mol/min out The energy balance with kinetic and potential energy changes and shaft workfomitted is Q=AH. The task is to evaluate AH = EhH₁-EhH₁. Since each species has only one inlet condition and one outlet condition in the process, two rows are sufficient for the enthalpy table. in

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:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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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
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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