Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the temperature at the base is 70 C and the ambient temperature is 20 C. Determine the fin efficiency if the actual heat transfer rate from the fin is 500 W?

Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the temperature at the base is 70 C and the ambient temperature is 20 C. Determine the fin efficiency if the actual heat transfer rate from the fin is 500 W?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.17P: 3.17 A 1.4-kg aluminum household iron has a 500-W heating element. The surface area is . The ambient...

See similar textbooks

Related questions

Q: Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 95 cm with…

A: Given: l=0.95m; d=0.65m; t=2.5mm k=157 W/m2K; ambient temperature 20 deg C; h=20 W/mC; and melting…

Q: An aluminum fin ( k=200 W/m .o C) 3 mm thickness and 7.5 cm long protrudes from a wall . The base is…

A: Given data: Here, k represents the thermal conductivity, t represents the thickness, L represents…

Q: A

A: Given data

Q: Problems within the wall is T(x) = a(L- ) +b where a = 10°C/m2 and b 30°C, what is the thermal con-…

A: Given data as per questionAssumptionsSteady state condition.One dimensional conductionNo internal…

Q: Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 80 cm with…

A: Given: l=0.8m; d=0.7m; t=3mm; k=177 W/m2K; ambient temperature is 25 C; h=20 W/mK; Tb=220 C

Q: Q3) A total of 10 rectangular aluminum fins (k = 203 W/m.K) are places on the outside flat surface…

Q: A steel pipe (k=43 W/m.K) has inner and outer diameters are 5 cm and 6 cm, respectively. The pipe is…

Q: An internal engine of a rocket (180°C furnace) generates heat flow of 23.2564 kW through a first…

A: ◆ This is the case of heat transfer through the cylindrical layer. ◆ The temperature profile for…

Q: An insulation (kins = 0.14 W/(m K) ) layer that is 0.002m thick surrounds a wire (diameter=0.0025m)…

Q: Question 6 A steel pipe (k = 48 W/m-K) of a heating system carries wet steam at 120 °C. The inner…

A: Given: The conductivity of steel pipe is k1=48 W/m·K. The temperature of the steam is T1=120°C. The…

Q: Convective heat transfer coefficient is 10 W/(m*K), surface area of the fin 2 is 1m^2, the…

Q: Calculate the overall heat transfer coefficient of the steel pipe based on the inner surface. The…

A: Heat transfer is given by Q = U*A*dT = (dT/R ) where R is thermal resistance R = (L/KA) and U is…

Q: An insulation system is to be selected for a furnace wall at 1000-C using first a layer of mineral…

A: Given:Furnace wall temperature, Ts=1000oCThermal conductivity of wool block, kwool=130 mW/moC=0.130…

Q: A 90-amp electric current is flowing through a 6-mm diameter lead wire. The thermal conductivity of…

Q: fin made of AL metal with thermal conductivity (199 W / mK). Fin dimensions 3 cm long and 2.5 mm…

A: given data: fin metal : Al : k = 199 W/mK length; l = 0.03 m thickness; t = 2.5 mm wall temperature;…

Q: Solution please, should correct determine the rate of heat loss of this cylindrical fin, where there…

A: GivenL=0.5mR=0.02mk=400 W/mKh=10 W/m2KTa=298KTo=773K the rate of heat loss of this cylindrical fin…

Q: Q2- Water flows inside a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm. and the…

Q: The volume of material available for a pin of square section is 4cm^3. The conductivity of the…

A: Given, Volume of material, V=4cm3Thermal conductivity , k=140W/mKHeat transfer coefficient,…

Q: The two pieces of wood, 150mm x 200mm, are glued together along the 55° joint. Determine the maximum…

Q: Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 150 cm with…

A: Given: L = 150 cm t = 4 mm Di = 85 cm Do = Di + 2t = 85 + 8 = 93 cm thermal conductivity, k = 167…

Q: A straight fin of rectangular profile ( k = 14 W/m . oC ) , thickness of t= 2 mm and L= 23 mm . The…

A: Given Data: The thermal conductivity of the fin is, k=14 W/m·°C. The thickness of the fin is, t=2…

Q: Determine the overall heat transfer coefficient based on the outer area of a 3.81 cm O.D and 3.175…

A: Given, And, the fouling resistance at the inside and outside the surface is, Rf = 0.0088 m2k / W

Q: Q2/ A plane wall (K =17 W/m.°C ) with (60 mm) thick. Both sides of the wall are insulated with ( 2…

Q: Consider a permanent one-dimensional heat conduction on a flat wall of length L = 0.4 m and constant…

Q: A very long fin ( k= 372 W/m .o C ) 2.5 cm diameter has one end maintained at 90 oC . The rod is…

A: As given fin is of infinite length so heat transfer is given as Q=kmθ0Ac Where k is thermal…

Q: You are designing a 3m x 3m floor with radiant heating. The floor has 12 parallel pex pipes (k = 40…

A: Designing a 3m x 3m floor with radiant heating. 12 parallel pex pipes (k = 40 W/mK) L = 3m, OD =…

Q: Q3) A stainless steel straight triangular fin has the thermal conductivity of the material used is…

Q: 8--The reactor from uniform carbide and graphite as a cylinder rod w diameter of 12 mm. The…

Q: Heat transfer through composite walls The wall of a refrigerated van is of 1.5 mm steel sheet at…

A: GivenTemperature at outer surface, To==(273-15) K=258KTemperature at outer surface, Ti=

Q: a. The wall of a building has a surface area of 50 m2. The outside layer of the wall is 20 cm thick…

A: Given data: Surface area of the wall, A = 50 m2 Thickness of concrete wall, Lc = 20 cm Thermal…

Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

not sufficient information

66 %

none of the given

15 %

33 %

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 by step

Solved in 2 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

2.30 An electrical heater capable of generating 10,000 W is to be designed. The heating element is to be a stainless steel wire having an electrical resistivity of ohm-centimeter. The operating temperature of the stainless steel is to be no more than 1260°C. The heat transfer coefficient at the outer surface is expected to be no less than in a medium whose maximum temperature is 93°C. A transformer capable of delivering current at 9 and 12 V is available. Determine a suitable size for the wire, the current required, and discuss what effect a reduction in the heat transfer coefficient would have. (Hint: Demonstrate first that the temperature drop between the center and the surface of the wire is independent of the wire diameter, and determine its value.)
An electronic device that internally generates 600 mW of heat has a maximum permissible operating temperature of 70C. It is to be cooled in 25C air by attaching aluminum fins with a total surface area of 12cm2. The convection heat transfer coefficient between the fins and the air is 20W/m2K. Estimate the operating temperature when the fins are attached in such a way that (a) there is a contact resistance of approximately 50 K/W between the surface of the device and the fin array and (b) there is no contact resistance (in this case, the construction of the device is more expensive). Comment on the design options.
2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1 m wide and 1 m tall. The fins are to be rectangular in cross section, 2.5 cm long and 0.25 cm thick, as shown in the figure. There are to be 100 fins per meter. The convection heat transfer coefficient, both for the wall and the fins, is estimated to be K. With this information determine the percent increase in the rate of heat transfer of the finned wall compared to the bare wall.
Estimate the rate of heat loss per unit length from a 5-cm ID, 6-cm OD steel pipe covered with high-temperature insulation having a thermal conductivity of 0.11 W/(m K) and a thickness of 1.2 cm. Steam flows in the pipe. It has a quality of 99% and is at 150C. The unit thermal resistance at the inner wall is 0.0026(m2K)/W the heat transfer coefficient at the outer surface is 17W/(m2K) and the ambient temperature is 16C.
1.37 Mild steel nails were driven through a solid wood wall consisting of two layers, each 2.5-cm thick, for reinforcement. If the total cross-sectional area of the nails is 0.5% of the wall area, determine the unit thermal conductance of the composite wall and the percent of the total heat flow that passes through the nails when the temperature difference across the wall is 25°C. Neglect contact resistance between the wood layers.
3.17 A 1.4-kg aluminum household iron has a 500-W heating element. The surface area is . The ambient temperature is 21°C, and the surface heat transfer coefficient is . How long after the iron is plugged in does its temperature reach 104°C?
Q2 fin made of AL metal with thermal conductivity (199 W / mK). Fin dimensions 3 cm long and 2.5 mm thick, extending from a wall and exposed to air at the end. Wall temperature 420 ° C and air temperature 25 ° C. Calculate the heat loss from the fin and the fin efficiency. Assume the heat transfer coefficient of 10 W / m K and neglect the heat loss at the fin tip. Explain the importance of assuming isolated n fin end in practice
Convective heat transfer coefficient is 10 W/(m*K), surface area of the fin 2 is 1 m^2, the temperature at the base is 60 C and the ambient temperature is 20 C. Determine the fin efficiency if the actual heat transfer rate from the fin is 200 W? 25 % not sufficient information O 75 % none of the above 50 %
Temp base is 156 not 456 as in the diagram
Blowtorch is used to connect the two pipes together. Length of the pipe section shown is 80 cm with an inner diameter of 70 cm. The thickness of the pipe wall is 3 mm. The conductivity of the pipe section is 177 W/m^2K. Environment has a temperature of 25 C and convective heat transfer coefficient of 20 W/(mC) , find the required heat transfer to join the pipe sections at 220 C? HINT: Assume that the welding section is the base plate and the pipe is 1D extended surface (fin) symmetric about the torch melting line. Heat transfer happens by conduction along the pipe thickness in horizontal direction and by convection to the environment. Length thickness Torch melting line
Solve shows al steps and solution 6.58 w is answer
A straight fin of rectangular profile ( k = 14 W/m . oC ) , thickness of t= 2 mm and L= 23 mm . The base temperature Tb = 220 oC while the fin is exposed to the environment at 23 oC with h= 25 W/m2 .oC Calculate the heat lost peer meter of fin depth. ( use the chart to calculate the efficiency )