3. A steam coil is immersed in a stirred heating tank. Saturated steam at 7.50 bar inlets the coiland after it condensed it exits the coil at same temperature. A solvent which has 2.30 kJ/kg heatcapacity is fed to tank at 25 °C with 12 kg/min constant flow rate and it exits the tank withsame flowrate. Initially the tank is at 25 °C temperature and includes 760 kg solvent. At t=0both the heating steam and solvent are feed to the tank. Heat transfer from steam to the solventis given by the equation Q(kJ/min) = UA(Tsteam-T) Here UA is the product of total heattransfer coefficient and transfer surface and it is equal to 11,5 kj/min °C.Assume that the tank is well stirred and the temperature of the exit stream is equal to the solventtemperature in the tank.a) Write the differential energy balance for tank content.b) Get a simple form for the balance that you get at part a and at steady-state find the exittemperature.c) How can the required time evaluated to increase the solvent temperature to T (anytemperature) ?d) What will be the temperature of solvent after 40 minutes? Assume that the tank is well stirred and the temperature of the exit stream is equal to the solventtemperature in the tank.a) Write the differential energy balance for tank content.b) Get a simple fom for the balance that you get at part a and at steady-state find the exittemperature.c) How can the required time evaluated to increase the solvent temperature to T (anytemperature) ?d) What will be the temperature of solvent after 40 minutes? 3. A steam coil is immersed in a stirred heating tank. Saturated steam at 7.50 bar inlets the coiland after it condensed it exits the coil at same temperature. A solvent which has 2.30 kJ/kg heatcapacity is fed to tank at 25 °C with 12 kg/min constant flow rate and it exits the tank withsame flowrate. Initially the tank is at 25 °C temperature and includes 760 kg solvent. At t=0both the heating steam and solvent are feed to the tank. Heat transfer from steam to the solventis given by the equation Q(kJ/min) = UA(Tsteam-T) Here UA is the product of total heattransfer coefficient and transfer surface and it is equal to 11,5 kj/min °C.

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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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3. A steam coil is immersed in a stirred heating tank. Saturated steam at 7.50 bar inlets the coil
and after it condensed it exits the coil at same temperature. A solvent which has 2.30 kJ/kg heat
capacity is fed to tank at 25 °C with 12 kg/min constant flow rate and it exits the tank with
same flowrate. Initially the tank is at 25 °C temperature and includes 760 kg solvent. At t=0
both the heating steam and solvent are feed to the tank. Heat transfer from steam to the solvent
is given by the equation Q(kJ/min) = UA(Tsteam-T) Here UA is the product of total heat
transfer coefficient and transfer surface and it is equal to 11,5 kj/min °C.
Assume that the tank is well stirred and the temperature of the exit stream is equal to the solvent
temperature in the tank.
a) Write the differential energy balance for tank content.
b) Get a simple form for the balance that you get at part a and at steady-state find the exit
temperature.
c) How can the required time evaluated to increase the solvent temperature to T (any
temperature) ?
d) What will be the temperature of solvent after 40 minutes?