Question 3.1: What effect do finned surfaces have on the overall heat transfer coefficient and hence the performance of a heat exchanger? When is the use of fins most appropriate?
Q: 1. A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot…
A: Given details: Cp=4.25 kJ/kg-kTout=85°CTin=50°Cm=1.4 kg/secU=1150 W/m2kAi=4 m2
Q: In a double-pipe, counter-flow heat exchanger, water entering at 1.5 kg/s is heated from 25°C to…
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Q: Counter flow heat exchangers and generally known to provide higher heat transfer compared to…
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Q: For phase-free heat transfer and turbulent flow on both sides of a tube-boiler type heat exchanger,…
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Q: Explain in detail the phenomenon and concept of the heat transfer involved in the heat exchanger and…
A: Heat exchanger is a device that is used to transfer heat between two fluids. An important aspect of…
Q: A double pass water-cooled shell-and-tube type condenser has a total number of tubes equal to 42.…
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Q: A 1-shell-pass and 8-tube-passes heat exchanger is used to heat glycerin (cp = 0.60 Btu/lbm·°F) from…
A: Given data as per question No. of tubes = 8 cp of glycerin= 0.60 Btu/lbm·°F Diameter = 0.5 in…
Q: A heat exchanger that is used for cooling lubricating oil is comprised of a thin-walled inner tube…
A: Diameter of inner tube, d1=30 mm=0.030 mDiameter of outer tube, d2=50 mm=0.050 mOverall heat…
Q: How is the NTU of a heat exchanger defined? What does it represent? Is a heat exchanger with a very…
A: NTU is abbreviated from Number of Transfer Units (NTU), it is a method for calculating the rate of…
Q: Oil in an engine is being cooled by air in a crossflow heat exchanger, where both fluids are…
A: Given, The specific heat of the oil, cp,h = 2047 J/kgK The specific heat of the air, cp,c = 1007…
Q: Water with a flow rate of 225 kg / h and a specific temperature of 4188 J / kgK is heated by a…
A: Given data: Mass flow rate of water, m˙w=225 kg/hr and it's specific heat, Cw=4188 kJ/kg.K.…
Q: (1) In a double tube heat exchanger in which hot and cold fluids flow into a countercurrent flow,…
A: We will answer the first question since the exact one is not specified. Please resubmit the question…
Q: Consider a concentric tube heat exchanger with an area of 50 m² operating under the following…
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Q: A shell-and-tube heat exchanger with 2-shell passes and 12-tube passes is used to heat water (cp =…
A: Given data: *The initial temperature of water is Tiw=20°C. *The outlet temperature of the water is…
Q: Consider a heat exchanger that has an NTU of 0.1. Someone proposes to triple the size of the heat…
A: The grouping of the terms UA/Cmin (where U is overall heat transfer coefficient, A is the surface…
Q: Q 3.1: What effect do finned surfaces have on the overall heat transfer coefficient and hence the…
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Q: 1. An oil heater heats 100 kg per minute of oil from 30°C to 100°C in a counter-flow heat exchanger.…
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Q: Consider a water-to-water double-pipe heat exchanger whose flow arrangement is not known. The…
A: Draw the figure of parallel flow arrangement. From the figure, the heat flows from cold water to…
Q: Design a concentric tube heat exchanger for cooling lubricating oil that is comprised of a thin-…
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Q: Define the NTU, EFFECTIVENESS and CAPACITY RATIO in a heat exchanger and also tell what each depicts…
A: NTU ( Number of transfer units):-NTU is used for heat transfer in heat exchanger and formula for the…
Q: Oil in an engine is being cooled by air in a crossflow heat exchanger, where both fluids are…
A: given data as per question
Q: What effect do finned surfaces have on the overall heat transfer coefficientand hence the…
A: Fins are provided to a heat exchanger surface to augment the heat transfer by increasing the…
Q: What effect do finned surfaces have on the overall heat transfer coefficient and hence the…
A: Fin: It is a thin extended surface attached to a larger body or structure to increase the heat…
Q: Prepare a heat exchanger design question about an example from your daily life and solve the…
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Q: Is a car radiator a heat exchanger? If yes, then which type of heat exchanger is this?
A: Yes, a car radiator is a heat exchanger. It is used to transfer thermal energy from one place to…
Q: Consider a double-pipe parallel-flow heat exchanger of length L. The inner and outer diameters of…
A: Here it is given :
Q: A shell-and-tube heat exchanger with 2-shell passes and 12- tube passes is used to heat water (cp =…
A: Let A=Area of heat transfer on the tube side U =Overall heat transfer coefficient =350W/m2K cpw…
Q: A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2·K…
A: Given data as per question Overall heat transfer coefficient = 284 W/m2·K Hot fluid entry…
Q: A long thin-walled double-pipe heat exchanger with tube and shell diameters of 1.0 cm and 2.5 cm,…
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Q: A mathematical expression for the overall heat transfer rate of a cross section exchanger in…
A: Formula Of Cross Flow Heat Exchanger Is Used
Q: Consider two heat exchanger configurations: parallel-flow and counter-flow. For both configurations…
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Q: Saturated water vapor at 100°C condenses in the shell side of a one-shell and two-tube heat…
A: Given data as per question water vapor temperature =100°C Surface area = 0.5 m2 Overall heat…
Q: What are the common causes of fouling in a heat exchanger? How does fouling affect heat transfer and…
A: The deposition of unwanted materials on the surface of the heat exchanger is known as fouling.
Q: determine the oil mass flowrate
A: here, oil as a minimum fluid is given.so, (m*Cpoil) is minimum. now use NTU relationship with area…
Q: a) Why the use of shell and tube heat exchanger is more compared to other heat exchangers? b) What…
A: Solution:
Q: 1. A thin-walled double pipe, counter-flow heat exchanger is to be used to cool oil (Cp = 2.2…
A: Answer: The overall heat transfer coefficient is 287.6956 W/m2•℃.
Q: What is the heat capacity rate? What can you say about the temperature changes of the hot and cold…
A: The heat capacity rate is defined as “the product of the mass flow rate and the specific heat of the…
Q: 1. A counter flow, 1-1 shell and tube heat exchanger is used to heat milk using hot water. Milk…
A: Given dataSpeciic heat of milk Cpm = 3930J/kgKSpecific heat of water Cpw= 4180J/kgKMass flow rate of…
Q: The condenser of a large thermal power plant is a body-tube type heat exchanger consisting of a…
A: Given Convection coefficient, h = 11000 W / m2K Mass flow rate, m =30000 kg / h…
Q: The hot and cold water inlets of a very long cased tube heat exchanger are 85oC and 15oC. The hot…
A: Given: The hot water temperature at inlet Th,i=85oC, The cold water temperature at inlet Tc,i=15oC,…
Q: A 2-m long thin walled concentric heat exchanger is used to dissipate heat from hot engine oil using…
A: Heat Transfer: According to the second law of thermodynamics, heat is always transferred from a…
Q: Show that the temperature profile of two fluid streams (hot and cold) that have the same heat…
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Q: What effect do finned surfaces have on the overall heat transfer coefficientand hence the…
A: given: What effect do finned surfaces have on the overall heat transfer coefficient hence the…
Q: How do we calculate the heat transfer of a shell and tube heat exchanger.?
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Q: d) Which of the following Fins/Heat exchanger will transfer more heat and why? Justify your answer.…
A: Write the expression for the heat transfer rate. Here, h represents the heat transfer coefficient,…
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 3.1: What effect do finned surfaces have on the overall heat transfer coefficient and hence the performance of a heat exchanger? When is the use of fins most appropriate?
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- L.1What are the best possible solutions to increase the heat transfer rate of a body.Which material will transfer more heat? Either a material with thermal conductivity ? = 121 or ? = 22 . Justify your answer. Explain the Fouling phenomenon. What is the effect of fouling on heat transfer rate? Which of the following Fins/Heat exchanger will transfer more heat and why? Justify your answer.Flat plate.Circular/pin fins.Triangular fins.Calculate the rate of overall heat transfer coefficient for the tube heat exchanger withinner and outer heat transfer coefficient of 670 W/m2 -K and 1880 W/m2 -K, respectively.Thermal conductivity of the tube wall is 27 W/m-K. The diameter and the thickness of thetube are 4 cm and 1.5 mm, respectively. Then, calculate the rate of heat transfer for the tube heatexchanger per meter length if the temperatures of inner and outer surfaces are 100°Cand 52°C, respectively.Determine the length needed for a simple concentric-tube, parallel flow heat exchanger to transfer heat from hot water to cold water at a rate of 900 W. The heat exchanger consists of two Type K copper (k=386 W/m-degC) tubes. The smaller tube has an inside diameter of 49.8 mm and an outside diameter of 54.0 mm. Assume that both film coefficients are equal to 100 W/sq.m.-degC. The hot water enters at 90 degC and leaves at 50 degC, and the cold water enters at 10 degC and leaves at 40 degC.
- EXAMPLE 3 Consider the heat exchanger finned-tube, cross-flow heat exchanger with a gas-side overall heat transfer coefficient and area of 100 W/m² · K and 40 m², respectively. The water flow rate and inlet temperature remain at 1 kg/s and 35C. However, a change in operating conditions for the hot gas generator causes the gases to now enter the heat exchanger with a flow rate of 1.5 kg/s and a temperature of 250C. What is the rate of heat transfer by the exchanger, and what are the gas and water outlet temperatures? that is, a 1² .What effect do finned surfaces have on the overall heat transfer coefficient and hence the performance of a heat exchanger? When is the use of fins most appropriateA heat exchanger has an over-all coefficient of heat transfer of 900 W/m2-K. The mean temperature difference is 20C and heat loss is 15,000 W. Calculate the heat transfer area. Group of answer choices 0.765 ?2 0.557 ?2 0.833 ?2 0.712 ?2
- (2.23) A finned heat exchanger tube is made of aluminum alloy (k = 186 W/m · K) and contains 125 annular fins per meter of tube length. The bare tube between fins has an OD of 50 mm. The fins are 4 mm thick and extend 15 mm beyond the external surface of the tube. The outer surface of the tube will be at 200°C and the tube will be exposed to a fluid at 20°C with a heat-transfer coefficient of 40 W/m2 · K. Calculate: (a) The rate of heat transfer per meter of tube length for a plain (un-finned) tube. (b) The fin efficiency. (c) The fin and prime surface areas per meter of tube length. (d) The weighted efficiency of the finned surface. (e) The rate of heat transfer per meter of tube length for a finned tube. (f) If the cost per unit length of finned tubing is 25% greater than for plain tubing, determine whether plain or finned tubing is more economical for this service. %3D Ans. (a) 1130 W. (b) 98.6%. (c) 0.8946 m? and 0.07854 m². (d) 98.7%. (e) 6920 W.How would you formulate this problem to obtain a more meaningful result which desired to cool a gas has [Cp = 0.35 Btu/(Ib)(°F)] from 190 to 95°F, using cooling water at 83°F. Water costs $0.30/1100 f, and the annual fixed charges for the exchanger are $0.60/ft of inside surface, with a diameter of 0.0775 ft. The heat transfer coefficient is U = 8 Btu/(h)(f)(F) for a gas rate of 2900 Ib/hr. Plot the annual cost of cooling water and fixed charges for the exchanger as a function of the outlet water temperature. What is the minimum total cost?Steam is produced in the copper tubes (k =223 Btu/h · ft · °F) of a heat exchanger at a temperature of 250°F by another fluid condensing on the outside surfaces of the tubes at 350°F. The inner and outer diameters of the tube are 1 in. and 1.3 in., respectively. When the heat exchanger was new, the rate of heat transfer per foot length of the tube was 2x104 Btu/h. (a) Determine the rate of heat transfer per foot length of the tube when a 0.01-in.-thick layer of limestone (k =1.7 Btu/h·ft·°F) has formed on the inner surface of the tube after extended use. (b) Assuming that a 0.01-in.-thick limestone layer has formed on both the inner and outer surfaces of the tube. Answer: 1.45x104 Btu/h; 1.20x104 Btu/h
- Steam is produced in the copper tubes (k =223 Btu/h · ft · °F) of a heat exchanger at a temperature of 250°F by another fluid condensing on the outside surfaces of the tubes at 350°F. The inner and outer diameters of the tube are 1 in. and 1.3 in., respectively. When the heat exchanger was new, the rate of heat transfer per foot length of the tube was 2x104 Btu/h.(a) Determine the rate of heat transfer per foot length of the tube when a 0.01-in.-thick a layer of limestone (k =1.7 Btu/h·ft·°F) has formed on the inner surface of the tube after extended use.(b) Assuming that a 0.01-in.-thick limestone layer has formed on both the inner and outer surfaces of the tubeA heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by 8 struts to an insulated outer tube of 40-mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel (k = 50W/m-K). E1 = 3 mm D. Water Gas Consider conditions for which water at 300 K flows through the inner tube at 0.161 kg/s while flue gases at 800 K flow through the annulus, maintaining a convection coefficient of 100 W/m2-K on both the struts and the outer surface of the inner tube. What is the rate of heat transfer per unit length of tube from gas to the water? Use the Dittus-Boelter equation to obtain the water-side convection coefficient. Determine the rate of heat transfer per unit length of tube from gas to the water, in W/m. i W/m Physical Properties Mathematical FunctionsA tube-launched rocket has stabilizing fins at its rear. During launch the fins experience hot gas at Tg = 1700 oC for a time t = 0.3 seconds. It is important that the fins survive launch without surface melting, T. Given the heat transfer coefficient is h, the heat flux per unit area is q=h(Tg-Ts). What is the objective for this design? High melting point Low thermal conductivity Launching efficiency Low melting point