Heat Transfer Consider a infinitely long pin fin with uniform Ac cross sectional area Write ef effectiveness and Af efficiency
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A: given data-Wall=0.8m×0.6mT0=10°CFin,L=7cm = 0.07md=3mm =0.003mk=200 W/mKρ=5000 kg/m2nfin=200…
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Q: calculate the reduction in the heat transfer rate if a 5-cm-insulation battwith thermal conductivity…
A: As heat transfer is given by, Q=-KAdTdxQA=-0.05*dT0.05=-dT
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A: Given data as per question Dimension of plate =0.8 m x 0.6 m Length of fin = 7 cm Diameter of fin =…
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A: Given :- Outside Diameter : 3cm thickness : 0.8 mm
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A: Given, T1 = 320 °CT2 = 40 °CL = 1 mkpipe = 58 W/m °Ckins1 = 0.18 W/m °Ckins2 = 0.09 W/m °CInternal…
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A: Temperature of water, Ti=35oCThermal conductivity of steel pipe, ks=50 W/m.KOuter diameter of pipe,…
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A: Equivalent Thermal Circuit
Q: Fins are used to improve heat transfer by increasing the effective * surface area TRUE O False O
A: Hi. as you have posted multiple questions and not specified which question needs to be solved, we…
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Q: The heat loss from a fin is 6W. The effectiveness and efficiency of the fin are 3 and 0.75…
A: Given:Qf=6 Wε=3η=0.75
Q: A thin brass pipe, 3 cm in outside diameter, carries hot water at 85°C. It is proposed to place 0.8…
A: Givan Data :- Dp =3cm Tw=85°C Tinf = 22°C Dfins = 8cm
Q: Steam passes at 250 ° C through a steel pipe with an inner diameter of 60 mm and an outer diameter…
A: In real life problems, Heat transfer is carried out by three phenomenon such as 1) Conduction:- When…
Q: 150 circular copper fins (k = 400 W / m ° C) of 5 cm diameter and 1 mm thickness are attached to a…
A: Write the given data with suitable variables. n=150kfin=400 W/m-°Cdfin=5 cm=0.05 m100 cm1 mdpipe=3…
Q: 3- Compare the value between the the actual heat transfer rate Qactual for the surface with fins and…
A: “Since you have asked multiple question, we will solve the first question for you. If you want any…
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A: Given data: Inner diameter (d) = 2.5 cm = 0.025 m Thickness of the wall…
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A: Given:Inside radius,r=5 cm=0.05mOuter radius,R=10 cm=0.10 mThermal conductivity,K=0.5WmKInside…
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Q: Pin fins are provided to increase the heat transfer from a hot surface. The perimeter of each fin is…
A: Arrangement 2 will have higher heat transfer rate.
Heat Transfer
Consider a infinitely long pin fin with uniform Ac cross sectional area
Write ef effectiveness and Af efficiency
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- 2.45 Heat is transferred from water to air through a brass wall . The addition of rectangular brass fins, 0.08 cm thick and 2.5 cm long, spaced 1.25 cm apart, is contemplated. Assuming a water-side heat transfer coefficient of and an airside heat transfer coefficient of , compare the gain in heat transfer rate achieved by adding fins to (a) the water side, (b) the air side, and (c) both sides. (Neglect temperature drop through the wall.)spherical shaped vessel of 14 m outer diameter is 90 mm thick Find the rate of heat leakage, if the temperature difference between the inner and outer surfaces is 220°C Thermal conductivity of the material of the sphere is 0.083 W/mKThe steel pipe has an internal radius of 50 mm., a thickness of 5 mm. and a length of 5 m. Inside the pipe, hot fluid with temperature 80 C flows inside the pipe and cold fluid with temperature 20 C flowing outside the pipe. Let k=285 W/mC and hi= 25 W/mC, ho= 10 W/mC. Find 4.1) Heat Transfer Rate (Q) 4.2) Temperature on both inner and outer tube surfaces...
- A spherical shaped vessel of 1.4 m diameter is 90 mm thick. Find the rate of heat leakage, if the temperature difference between the inner and outer surfaces is 220oC. Thermal conductivity of the material of the sphere is 0.083 W/m-K.150 circular copper fins (k = 400 W / m ° C) of 5 cm diameter and 1 mm thickness are attached to a pipe of 3 cm diameter and 150 cm length, the outer surface of which is kept at 220 ° C. The gap between the wings is 9 mm and the pipe is in an environment at 22 ° C. Since the heat transfer coefficient between the pipe and the ambient air is 80 W / m2 ° C, calculate the heat transfer amount from the finned pipe. Find the amount of increase in heat transfer.Find the (1) heat flow rate in Watts (W) and (2) interface temperatures through the composite wall as shown in the figure. The exposed surface of wall A has a temperature of 400°C while that of wall D is 60°C. Assume one dimensional flow and take KA=150 W/m-°C, KB= 30W/m-°C, KC= 65W/m-°C, KD= 50W/m-°C. Also take Xa=3cm, xb= xc=8cm and xd= 5cm.
- A 10 ft length of pipe with an inner radius of 1 in and outer radius of 1.25 in has an outer surface temperature of 250 F. The heat transfer rate is 30,000 BTU/hr. Find the interior surface temperature. Assume k = 25 BTU/hr-ft-F.The average rate at which energy is conducted outward through the ground surface in North America is 54.0 mW/m2, and the average thermal conductivity of the near surface rocks is 2.50 W/m K. Assuming a surface temperature of 10.0oC, find the temperature at a depth of 10.0 km. Ignore the heat generated by the presence of radioactive elements.Water at an average temperature of 23 deg C flows through a 10-cm diameter pipe that is 2.5 m long. The pipe wall is heated by steam and is held at 100 deg C. The convective heat transfer coefficient is 2.25 x 10^4 W/m^2K. Find the heat flow in W.
- Water with a velocity of 1 m/s through a pipe with an inner diameter of 32 mm and an outer diameter of 36 mm.passes. Water enters the pipe at 38°C and leaves at 22 °C. Heat conduction of pipe materialcoefficient is 54 W/m°C. A refrigerant evaporates outside the pipe at 10 °C.The heat transfer coefficient of the outer surface of the pipe is given as 1750 W/m^2°C. According to thisCalculate the required pipe length4.) A 15-cm-diameter steam line carries saturated steam at 6 MPa and is located in a tunnel with stagnant air with a temperature of 50oC. The outside unit convective coefficient is 8.5 W/m2-K. The steam line is covered with 3 cm of 85% magnesia insulation. It is decided to reduce the heat loss by one-half. How much 85% magnesia insulation is required? Neglect thermal resistance of pipe and inside surface.You want to increase the heat flux dissipated by a tube, OD = 2.5 cm, by placing cooling fins circular. The thickness, height and thermal conductivity of the fins are: 1mm, 1.25 cm and 160 W/mC, respectively. The fins are equally spaced such that there are 100 fins for every meter of tube length. If the The outer surface temperature of the tube is 170 C, the ambient temperature is 30 C, and the transfer coefficient of heat is h = 200 W/m2K, determine the increase (percentage) in the heat flux dissipated by the tube by placing the cooling fins. Take the efficiency of each fin to be 85%.