Q4) Consider a tube-and-shell heat exchanger consisting of one single shell and one tube, each executing one pass. The hot air of 100°C enters the shell at the rate of 1m³/s. The water of 10°C enters the tube at a mass rate of 0.16kg/s. The density and the heat capacity of the hot air are assumed to constant, Pair = 0.9461 kg/m³ and Cp, air = 1011 J/kg. °C. The density and the heat capacity of the cold water are assumed constant, Pwater = 999.65 kg/m³ and Cp.water = 4190 J/kg. °C. Please note you should show your calculations for all of your answers to the following questions. Parallel-flow Thimni Hot air Counter-flow Tho.mno4 comco Tho, mno Answer the following questions: a) b) c) d) Temel Cold water Teo. mco Thi mn Hot air Which is more efficient? Parallel-flow or counter-flow? Why? For a parallel-flow heat exchanger, if the pipe length is infinite long, what is the outlet temperature of the tube? For a parallel-flow heat exchanger, if the pipe length is infinite long, what is the outlet temperature of the shell? For a counter-flow heat exchanger, if the pipe length is infinite long, what is the outlet temperature of the tube? Temel Cold water

Q4) Consider a tube-and-shell heat exchanger consisting of one single shell and one tube, each executing one pass. The hot air of 100°C enters the shell at the rate of 1m³/s. The water of 10°C enters the tube at a mass rate of 0.16kg/s. The density and the heat capacity of the hot air are assumed to constant, Pair = 0.9461 kg/m³ and Cp, air = 1011 J/kg. °C. The density and the heat capacity of the cold water are assumed constant, Pwater = 999.65 kg/m³ and Cp.water = 4190 J/kg. °C. Please note you should show your calculations for all of your answers to the following questions. Parallel-flow Thimni Hot air Counter-flow Tho.mno4 comco Tho, mno Answer the following questions: a) b) c) d) Temel Cold water Teo. mco Thi mn Hot air Which is more efficient? Parallel-flow or counter-flow? Why? For a parallel-flow heat exchanger, if the pipe length is infinite long, what is the outlet temperature of the tube? For a parallel-flow heat exchanger, if the pipe length is infinite long, what is the outlet temperature of the shell? For a counter-flow heat exchanger, if the pipe length is infinite long, what is the outlet temperature of the tube? Temel Cold water

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

Q4)
Consider a tube-and-shell heat exchanger consisting of one single shell and one tube, each
executing one pass. The hot air of 100°C enters the shell at the rate of 1m³/s. The water of 10°C
enters the tube at a mass rate of 0.16kg/s. The density and the heat capacity of the hot air are
assumed to constant, Pair = 0.9461 kg/m³ and Cp, air = 1011 J/kg. °C. The density and the heat
capacity of the cold water are assumed constant, Pwater = 999.65 kg/m³ and Cp,water = 4190
J/kg. °C. Please note you should show your calculations for all of your answers to the following
questions.
Parallel-flow
Thi, mni
Hot air
Counter-flow
Tho, mno
Teo meo.
Tho, mn,o
Answer the following questions:
a)
b)
c)
d)
Tel, mel
Cold
water
Tc.o. mc.o
Thi mhi Hot air
Which is more efficient? Parallel-flow or counter-flow? Why?
For a parallel-flow heat exchanger, if the pipe length is infinite long, what is the
outlet temperature of the tube?
For a parallel-flow heat exchanger, if the pipe length is infinite long, what is the
outlet temperature of the shell?
For a counter-flow heat exchanger, if the pipe length is infinite long, what is the
outlet temperature of the tube?
Телится
Cold
water

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A heat exchanger is being investigated as a waste heat recovery device. A heat exchanger is common device for using a hot fluid to heat a cold fluid without the fluids mixing. The following information is known. The cold fluid stream of liquid A enters at 294.2 K and leaves the device at a temperature of 320.91 K. Liquid A flows at a rate of 0.006 Kg/s and has a specific heat of 4180 J/(Kg K). Liquid B enters the device at a temperature of 350.2 K. Liquid B flows at a rate of 0.005 Kg/s and has a specific heat of 3900 J/(Kg K The dead state is at 293.2 K and 1 bar. The device is adiabatic and the pressure losses are neglected in this problem. Both liquids are incompressible materials. Tout=316.154K Answer the following: If the exiting liquid B is not used for any useful purpose, calculate the exergy destroyed associated with it.
Consider the steady-state counterflow heat exchanger shown below. There are separate streams of air and water, and each stream experiences no noticeable change in pressure. Stray heat transfer with the surroundings and changes in kinetic and potential energy can be ignored. For the air, the ideal gas model can be applied and Rair = 0.287- For the operating conditions provided on kg-K the figure, determine: a. The temperature of the air at the outlet of the heat exchanger, T4, in [K] b. The rate of heat transfer between the air and the water, in [kW; , c. The rate of entropy production for the heat exchanger, in [kW/K] kg msteam = 12 P1 = 3 bar X1 = 1 P2 = P1 T2 = 200 P3 = 1 bar T3 = 1100 K P4 = P3 T, =? mair kg = 3.29
2-) 10500 kg/hr of water is heated using a counter-flow, double-pipe heat exchanger utilizing superheated steam. Steam passes through the heat exchanger at 130 °C after entering at 180 °C. Water has an entrance temperature of 30 °C and an outlet temperature of 80 °C. Calculate the heat transfer area if the overall heat transfer coefficient from steam to water is 814 W/m² K. How much more area would there be if the fluid flow was parallel?
Parvinbhai
A well-insulated heat exchanger is to heat water (cp = 4.18 kJ/kg-°C) from 25°C to 60°C at a rate of 0.5kg/s. %3D The heating is to be accomplished by geothermal water (cp = 4.31 kJ/kg-°C) available at 140°C at a mass flow rate of %3D 0.5 kg/s. What is the temperature of exit Brine. Water 25°C Brine 140°C 60°C