Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Calculate a thermal resistance of a copper tube (d1 = 0.192 mm, d2 = 0.208 mm, λ = 310 W/mK) with a Styrofoam layer of di = 0.070 mm.
6. 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 diameter of the tube is 2.5 cm tand the thickness is 0.4 mm. The tube is exposed to an environment with h = 6.5 W/m 2 - o C and temperature of 15 o C. Calculate the the heat loss for 1 m length. What thickness of insulation having k = 40 W/m- 0 C should be added to reduce heat loss by 90 %.
3.A steam at 118°C is flowing inside a diameter of 40 mm, thickness of 10 mm ceramic pipe (k=1.52 W/mK). The pipe is insulated with 25 mm of insulator (k=0.064 W/m K). The convective coefficient for steam inside the pipe is h;=20.7 W/m²K and the convective coefficient for air outside the pipe is h.=0.07W/m²K. The air is at a temperature of 28°C ?
(1)Calculate the heat loss per unit length of 1m of pipe (W)?
(2)Repeat, using the overall U; based on the inside area A; ?
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- Calculate the heat loss per foot from a 10 in. nominal pipe ( outside diameter = 10.75 in.) covered with a composite pipe insulation consisting of 1 ½ in of insulation A placed next to the pipe and 2 in. of insulation B placed upon insulation A. Assume that the inner and outer surface temperature of the composite insulation are 700°F and 110°F respectively , and that the thermal conductivity of material I is 0.05 Btu/ hr-ft-°F and for material II is 0.039 Btu/hr-ft-°F (Include illustration/Figure)arrow_forwardA steel rod, 12 mm in diameter, passes centrally through a copper tube 2.5 m long and having 36 mm and 48 mm as internal and external diameters respectively. The tube is closed at each end by 24 mm thick steel plates which are secured by nuts. The nuts are tightened until the copper tube is reduced in length by 0.50. The whole assembly is then raised in temperature by 60 degrees Celsius. Steel: Coefficient of expansion = 1.2x10^-5/degrees Celsius, Es = 200 GPa Copper: Coefficient of expansion = 1.75x10^-5/degrees Celsius, Ec = 100 GPa Calculate the stress in copper and stress in steel after the rise of temperature if the thickness of the plates remains unchanged. Indicate if the answer is tensile, tension, compression.arrow_forwardPresents the diagram of the problem, necessary formulas, clearance and numerical solution: A metal plate 4 mm thick has a temperature difference between its two faces of 32 ◦C. It transmits 200 kcal/h through an area of 5 cm2. Calculate the thermal conductivity of the metal in W/m K.arrow_forward
- Example 6: Calculate the critical radius of insulation for asbestos [k = 0.17 W/m · ◦C] surrounding a pipe and exposed to room air at 20◦C with h = 3.0 W/m2 · ◦C. Calculate the heat loss from a 200◦C, .5cm-diameter pipe when covered with the critical radius of insulation and without insulation.arrow_forwardA superalloy gas turbine component was originally designed to operate at temperatures up to 760°C and exhibited a stress rupture life of 900 h under this operating condition. An updated design calls for a thermal barrier coating to be added to the same component to allow engine operation under the same conditions, but with an increase in reliability. If an increase in rupture life to 1800 h is desired, what temperature differential between the inside and outside of the component must be achieved by the addition of the TBC?arrow_forwardConsider the osmotic pressure-mediated nuclear compression under various concentrations of polyethylene glycol (PEG). What would the bulk modulus be if a nucleus with volume 1500 µm3 was reduced to 1000 µm3 with a 10% PEG solution?arrow_forward
- Solving Thermal Properties Related Problems Estimate the thermal diffusivity of butter at 20°C.arrow_forwardTwo inches of urethane foam will reduce heat loss close to 1000% when applied to a 2-inch diameter uninsulated steel pipe. Assume the pipe wall thickness is 0.25-inches, the pipe interior convective heat loss (hi) is 500 BTU/hr-ft2-oF, and the pipe outside convective heat loss ho 20 BTU/hr-ft2-oF, k steel is 25 BTU/hr-ft-oF, and k insulaton is 0.023 BTU/hr-ft-oF. (hint - calculate heat loss with and without insulation.arrow_forwardIn 2012, a new fiber-optic cable of handling 40,000 telephone calls simultaneously was laid under the Pacific Ocean from California to Japan, a distance of 13,300 km. The cable was unreeled from shipboard at a mean temperature of 22oC and dropped to the Ocean floor having a mean temperature of 5oC. The coefficient of linear expansion of the cable is 75×10-6 /degree celsius. Determine the length of cable that must be carried on the ship to span the 13,300 Km. Also, find the percent change in lengtharrow_forward
- A 45.6 W power is supplied to a asbestos cement board with a thickness of 0.006m. Water of 60°C is circulating to protect the specimen with a diameter of 0.25m. Calculate the thermal conductivity of asbestos cement boardarrow_forward1.)An aluminum tank with a volume of 1000 liters is filled with gasoline. Both are at a temperature of 12°C. The tank is transported to a place where the temperature is 37° and, due to the difference between the volumetric expansion coefficients of the metal and the liquid, the ebb of the tank. Assuming the tank expands like a massive volume of aluminum, how many liters of gasoline overflow from the tank? Data: βaluminum=7*10-5/ºC and βgas=9.5*10-4/ºCarrow_forwardPROBLEM: VIE-27 BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUDarrow_forward
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Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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