Q. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose wallsare maintained at a temperature of 130 °C. Circular aluminum alloy 2024-T6 fins k = 186 W/m.Kof outer diameter 6 cm and constant thickness 1 mm are attached to the tube. The space betweenthe fins is 3 mm, and thus there are 250 fins per length of the tube. Heat is transferred to thesurrounding air at 25 °C, with a heat transfer coefficient of 40W/m².K. Determine:1. The increase in heat transfer from the tube per meter of its length as result of adding fins.2. The efficiency of the fins.3. Temperature at mid-point of the fins.Note: Equations and any other data required can be taken from textbook/handbook.130°C25°C

GivenThickness of fins t=1mmSpace between fins x=3mmAmbient air temperature T∞=25°CHeat transfer…

Q. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose w are maintained at a temperature of 130 °C. Circular aluminum alloy 2024-T6 fins k= 186 W/p of outer diameter 6 cm and constant thickness 1 mm are attached to the tube. The space betw the fins is 3 mm, and thus there are 250 fins per length of the tube. Heat is transferred to surrounding air at 25 °C, with a heat transfer coefficient of 40W/m².K. Determine:

Q. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose w are maintained at a temperature of 130 °C. Circular aluminum alloy 2024-T6 fins k= 186 W/p of outer diameter 6 cm and constant thickness 1 mm are attached to the tube. The space betw the fins is 3 mm, and thus there are 250 fins per length of the tube. Heat is transferred to surrounding air at 25 °C, with a heat transfer coefficient of 40W/m².K. Determine:

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

See similar textbooks

Related questions

Q: Hot water is transported from a cogeneration power station to commercial and industrial users…

A: Data given- D= 150 mm = 0.15 m R= 75 mm = 0.075 m K = 1.4 W/mK w= 0.3 m T∞ = 0°C h= 25 w/m2k Ti=…

Q: A highly corrosive liquid is cooled by passing it through a circular channel with a diameter of 5 cm…

A: To Find : The rate of heat loss from the liquid. Given : The diameter of hole is The thermal…

Q: Two heat reservoirs with respective temperatures of 325 and 275 K are brought into contact by an…

A: Given data: T1=325 KT2=275 KL=200 cmA=24 cm2k=79.5 W/m.K Need to determine the heat flux between the…

Q: A central heating system from a house consists of 50m of 15mm outside diameter copper pipe with a…

Q: A sphere which is 12.7 mm in diameter, is at 66 °C before it is inserted into an airstream having a…

A: The Biot number (Bi) is approximately 0.0671Explanation:Given:Diameter of the sphere (d) = 12.7 mm =…

Q: Steam at a temperature of 300 °C flows through a steal pipe, k = 14.9 W/m.K of 60 mm inside diameter…

A: In general, there are three modes by which heat gets transferred from one place to another. The…

Q: Question #1 Calculate the heat losses from an insulated steel pipe (k = 50 W/m K) with an internal…

A: Given:Thermal conductivity of steel pipe, kst=50 W/m.KInternal diameter of the pipe, d1=6 cm=0.06…

Q: rod of 2 cm and characteristic length of 0.5 cm diameter which is initially at 100 °C is quenched in…

Q: Pls handwrite

Q: Handwrite please

A: • Fouling factor on the gas side Rf,i=0.0015 m2⋅K/W

Q: wo heat reservoirs with respective temperatures of 325 and 275 K are brought into contact by an iron…

A: Given Thermal conductivity, k = 79.5 W/m K Temperature, T1 = 325 K…

Q: Air flows at 120 o C in a thin-walled tube (k = 18 W/m o C) with h = 65 w/m 2 - o C. The inside…

Q: Hot water at 160 ⁰C is passing through a pipe, and it is lagged with a plastic covering. The…

A: Temperature of the hot water:Thermal conductivity of the plastic:Heat transfer…

Q: Hot water at 160 ⁰C is passing through a pipe, and it is lagged with a plastic covering. The…

A: Hot water, Ti = 160 ⁰Ck= 0.2 Wm-1K-1 h = 16 Wm-2K-1T ∞ = 25 ⁰C

Q: 3. A 3 in O.D. aluminum tube (k=133 BTU/h ft°F) has 16 longitudinal fins spaced around its outside…

A: Give data: The outer diameter of the tube, do=3 in. The thermal conductivity of aluminum, k=133…

Q: s A & B SOLVE CAREFULLY!! Please Write Clearly and Box the final Answer(s) and label them

A: Given:Diameter of pipe, d1=100 mmradius of pipe, r1=50 mmwall temperature of pipe, T1=-10o…

Q: = 16 W/m.K. The inner diameter and thickness of the pipe are 26 cm and 1 cn espectively. The…

A: Boundary Conditions T( r1 ) = T1 =350oC T( r2 ) = T2 = 28oC dTdr=C1r T(r) = C1 lnr + C2 T( r1 ) =…

Q: Hot water at 160 ⁰C is passing through a pipe, and it is lagged with a plastic covering. The…

A: The thermal efficiency and the mean effective pressure.Given:The initial pressure of the air is P…

Q: A technique for measuring convection heat transfer coefficients involves bonding one surface of a…

A: given data : insulation thickness and thermal conductivity, L = 10mm=0.01m, k = 0.040 W/ mKheat…

Q: a 50cm diameter pipeline in the arctic carries hot oil where outer surface is maintained at 30C and…

A: Given:D=50 cmR=25 cmTo=30°CT∞=-10°Ct=5 cmK=7 W/m°Ch=9 W/m2°C

Question

Q. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls
are maintained at a temperature of 130 °C. Circular aluminum alloy 2024-T6 fins k = 186 W/m.K
of outer diameter 6 cm and constant thickness 1 mm are attached to the tube. The space between
the fins is 3 mm, and thus there are 250 fins per length of the tube. Heat is transferred to the
surrounding air at 25 °C, with a heat transfer coefficient of 40W/m².K. Determine:
1. The increase in heat transfer from the tube per meter of its length as result of adding fins.
2. The efficiency of the fins.
3. Temperature at mid-point of the fins.
Note: Equations and any other data required can be taken from textbook/handbook.
130°C
25°C

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A stainless steel (AISI 304) tube used to transport a chilled pharmaceutical has an inner diameter of 36 mm and a wall thickness of 2 mm. The steel has thermal conductivity k=14.2 W/m/K The pharmaceutical and ambient air are at temperatures of 6 °C and 23 °C, respectively, while the corresponding inner and outer convection heat transfer coefficients are 400 W/m²/K and 6 W/m²/K, respectively. (a) What is the heat gain per unit tube length? (b) What is the heat gain per unit length if a 10 mm thick layer of calcium silicate insulation 0.05 W/m/K) is applied to the outer surface of the tube? Assume there is no contact = (Kins resistance.
Circumferential fins of constant thickness of 1 mm are fixed on a 60 mm pipe at a pitch of 4 mm. The fin length is 20 mm. The wall temperature is 130°C. The thermal conductivity of the material is 210 W/mK. The convection coefficient is 50W/m2K. Determine the heat flow and effectiveness. 100 Tr. 10 1.5 2.0 waad u ko a
Hot water at 160 ⁰C is passing through a pipe, and it is lagged with a plastic covering. The coefficient of thermal conduction of the plastic is 0.2 Wm-1K-1 and the heat transfer coefficient is 16 Wm-2K-1. The ambient temperature surrounding the pipe is 25 ⁰C. Determine the critical radius and hence the maximum heat loss. Calculate the heat loss for varying thicknesses of lagging and plot this against the thickness. From the graph, estimate an optimal thickness of lagging and explain your reasons. You can use Excel for the calculations and plotting.
uo 9:EV * ASIACELL l. Quize-1.pdf A diagram of a heat sink to be used in an electronic application is shown below. There are a total of 9 aluminium fins (k = 175 W/m K, C 900 J/kg K, p= 2700kg/ m') of rectangular cross-section, each 60 mm long, 40 mm wide and 1 mm thick. The spacing between adjacent fins, s, is 3 mm. The temperature of the base of the heat sink has a maximum design value of T, = 60°C, when the external air temperature T, is 20°C. Under these conditions, the extemal heat transfer coefficient h is 12 W/m K. The fin may be assumed to be sufficiently thin so that the heat transfer from the tip can be neglected. The surface temperature T, at a distance, x, from the base of the fin is given by: (T, -T, )cosh m(L-x) hP and A, is the cross sectional area. kA T-T, = where m? = sinh mL Determine the total convective heat transfer from the heat sink, the fin effectiveness and the fin efficiency. 40 mm 1 mm T, = 20°C h=12 W/mK 3 mm T, = 60°C N = 9 fins K = 175 W/m K 50 mm
2. A pipe with: ID: 130mm OD: 165mm k=15 W/m?-K L= 2m is insulated with several materials, and convection on the inside and outside of the pipe is as follows. Oil inside is at 118°C and air outside is at 25°C KA or h 10.256 W/m2-K Material Thickness A 25mm В 2.369 W/m2-K 30mm C 0.257 W/m2-K 40mm h=120.3T2/3 (T in K) h=0.272/3 (T in K) Oil inside Air outside Determine the heat losses of the pipe, and what must be the temperature of the oil to decrease the heat losses by 20%?
Carbon steel (AISI 1010) shafts of 0.1-m diameter are heat treated in a gas-fired furnace whose gases are at 1200 K and provide a convection coefficient of 100 W/m².K. If the shafts enter the furnace at 220 K, use the lumped capacitance model to estimate how long must they remain in the furnace to achieve a centerline temperature of 800 K? Use p = 7832 kg/m³, k = 51.2 W/(mK), c = 541 J/(kg-K) and a = 1.21 x 10-5 m²/s. They must remain in the furnace for i S.
Define: a. Convection heat transfer coefficient b. Loss of pressure across the tube arrangement *)Based on image below:
Pressurized steam flows through a pipe of 0.6 m diameter. The pipe is embedded in a concrete block ,conductivity k = 1.4 W/mK ,with a square cross sectional length, w = 1 m. The required surface temperature values are 401 and 301 in K. Calculate the heat loss from the pipe per unit length. w Concrete T1 T2 D = 0.6 m
A gas at 525 ° C flows through an AISI 316 stainless steel pipe (di = 94 mm and do = 100 mm). The pipe is covered with a layer of mineral wool granulate with 35 mm thick asbestos binders. The pipe is exposed to ambient air at 25 ° C. The heat transfer coefficients for the surrounding gas and air are 29 W / (m2 K) and 12W / (m2 K), respectively. Do the following: Estimate the temperature on the surface of the coating exposed to the environment.
Temp base is 156 not 456 as in the diagram
KNOWN: Expression for face-averaged Nusselt numbers on a cylinder of rectangular cross section. Dimensions of the cylinder. FIND: Average heat transfer coefficient over the entire cylinder. Plausible explanation for variations in the face-averaged heat transfer coefficients. SCHEMATIC: Air V = 10 m/s T = 300 K c = 40 mm ASSUMPTIONS: (1) Steady-state conditions, (2) Constant properties. d = 30 mm
A gas at 525 ° C flows through an AISI 316 stainless steel pipe (d.i = 94 mm and d.o. = 100 mm). The pipe is covered with a covering of mineral wool granules with 35 mm thick asbestos binders. The pipe is exposed to ambient air at 25 ° C. The heat transfer coefficients for the surrounding gas and air are 29 W / (m2 K) and 12W / (m2 K), respectively. Do the following: (a) Draw a schematic diagram and the thermal resistances of the scheme b) Calculate the critical radius and indicate if the coating increases or decreases heat transfer c) Calculate the heat loss per meter of tube length with the covering. d) Estimate the temperature on the surface of the coating exposed to the environment