443. Heat Loss from a Buried Pipe A water pipe whose wall temperature is 300 K has adiameter of 150 mm and a length of 10 m. It is buried horizontally in the ground at adepth of 0.40 m measured to the center line of the pipe. The ground surface temper-ature is 280 K and k = 0.85 W/m .K. Calculate the loss of heat from the pipe13.y-3Ans. q = 451.2 W

Answered: 443. Heat Loss from a Buried Pipe A…

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.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.37P

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Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5-cm-ID, 60-cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16C, and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/m K. The properties of the oil at various temperatures are listed in the following table: Temperature, T(C) 15 30 40 65 100 (kg/m3) 912 912 896 880 864 c(kJ/kgK) 1.80 1.84 1.925 2.0 2.135 k(W/mK) 0.133 0.133 0.131 0.129 0.128 (kg/ms) 0.089 0.0414 0.023 0.00786 0.0033 Pr 1204 573 338 122 55
7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?
3.10 A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is , estimate the temperature of the shell after reentry, assuming the time of reentry is 10 min and the interior of the shell is evacuated.
Water at a temperature of 77C is to be evaporated slowly in a vessel. The water is in a low-pressure container surrounded by steam as shown in the sketch below. The steam is condensing at 107C. The overall heat transfer coefficient between the water and the steam is 1100W/m2K. Calculate the surface area of the container that is required to evaporate water at a rate of 0.01 kg/s. Problem 1.16
10.8 The heat transfer coefficient of a copper tube (1.9-cm II) and 2.3-em OD) is on the inside and on the outside, but a deposit with a fouling factor of (based on the tube outside diameter) has built up over time. Estimate the percentage increase in the overall heat transfer coefficient if the deposit were removed.
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.
STEAM FLOW IN AN INSULATE PIPE AT ATEMPERATURE 130 C. THE INSIDE HEAT TRANSFER COEFFICIENT IS 79 W/M-K AND THE OUTSIDE COEFFICIENT IS 15 W/M-K. THE PIPE IS MILD STEEEL (K=57 WLM-K) AND HAS AN INSIDE RADIUS OF 50 MM AND AN OUTSIDE RADIUS 57 MM. THE PIPE IS COVERD WITH A 25.4 MM LAYER ( K=0.09 W/M-K). DETERMINE THE OVERALL HEAT TRANSFER COEFFICIENTIF THE SURROUNDING AIR TEMPERATURE IS 21.1 C.

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