0.06kg/s of hot air flows through an insulated sheet metal duct of 180 mm Diameter. The air enters the duct at a temperature of 110⁰ and after a distance of 4.5 m gets cooled to a temperature of 70⁰c if the heat transfer officiant between the outer surface of the duct and cold ambient air at 5⁰C is 6.5 w/m²-C calculate the following: a. The heat loss from the duct over its 4.5m at a length of 4.5m

0.06kg/s of hot air flows through an insulated sheet metal duct of 180 mm Diameter. The air enters the duct at a temperature of 110⁰ and after a distance of 4.5 m gets cooled to a temperature of 70⁰c if the heat transfer officiant between the outer surface of the duct and cold ambient air at 5⁰C is 6.5 w/m²-C calculate the following: a. The heat loss from the duct over its 4.5m at a length of 4.5m

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 7.24P

See similar textbooks

Similar questions

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
The operations management of the industrial plant where you work asks you to determine the length of a 2.0 ?? diameter pipe that will be used to heat water from an inlet temperature of 20.0°C to an outlet temperature of 60.0 °C. . The operational flow of water in the pipe is to be 0.6 m/s, and the surface temperature of the wall is to be kept constant at 90.0°C by condensing steam.For the development of this task, you must obtain the properties of water at the average temperature of the fluid.To determine the forced convection heat transfer coefficient use the correlation:?? = 0.023??^0.8??^0.4
Heat Transfer with a Liquid Metal. The liquid metal bismuth at a flow rate of 2.00 kg/s enters a tube having an inside diameter of 35 mm at 425°C and is heated to 430°C in the tube. The tube wall is maintained at a temperature of 25°C above the liquid bulk temperature. Calculate the tube length required. The physical properties are as follows (H1): k = 15.6 W/m K, c,=149 J/kg K, u = 1.34 x 10-3 Pa s.
A tube with a square cross-section 2 mm in side and 1.5 m in length imposes a constant heat flux of 20 × 10³ W/m² in a fluid flowing with a mass flow of 10 g/s. If the temperature of the fluid at the entrance of the duct is 29 °C, what will the temperature of the wall of the duct (in °C) be at the exit of the same for the fluid being pure water?
A 10-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with Ti=25°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped arounf the outer surface of the pipe, so that the fluid exits at 75°C. Assuming fully developed flow and taking the average fluid properties to be ρ=1000 kg/m3, cp=4000 J/kg·K, µ=2x10-3 kg/m·s, k=0.48 W/m·K, and Pr=10, determine: The required surface heat flux , produced by the heater The surface temperature at the exit, Ts The pressure loss through the piper and the minimum power required to overcome the resistance to flow.
Steam condenses at 100°C on the outer surface of a pipe with a thermal conductivity of 180 J/ms°C. The surface heat transfer coefficient of the water flowing in the pipe is 4000 J/m²s°C, and the heat transfer coefficient created by the steam condensing outside is 10000 J/m²s°C. The length of the pipe is 5 m and the thread diameter is 25 mm. Since the pipe thickness is 1 mm, calculate the total heat transfer coefficient and the rate of heat transfer from the condensed steam to the water at 15 °C
Water flows in a pipe of 0.0475 m inside diameter at a velocity of 1.5 m/s. Calculate the heat transfer coefficient if the temperature of the water is 60OC and 40OC at the inlet and the outlet of the pipe respectively, and the inside wall temperature of the pipe is 35OC. The physical properties must be calculated at the average water temperature. The thermal conductivity of the pipe at average temperature is 0.639 W/mOC.
Heat transfer
Engine oil enters a straight tube with a flow rate of 1 kg/s. The tube has a diameter of 5 mm and the surface temperature of the tube is maintained at 150˚C. The engine oil has an inlet temperature 52˚C and it is desired to heat the oil to a mean temperature of 80˚C at the exit of the straight tube. The properties of the engine oil are k = 0.139 W/m.K, Pr = 834, cp = 2072 J/kg.K and μ = 5.62 x 10-2 N.s/m2 Assume the flow is at fully developed region, determine:(a) The required length of the tube. (b) The rate of heat transfers from the tube to the engine oil.
Q1 a) What is the physical significance of Reynolds number? Write down 5 (five) factors that influence the convection heat transfer rates. b) Water is to be heated from 10°C to 80°C as it flows through a 2-cm-internal-diameter, 7-m- long tube. The tube is equipped with an electric resistance heater, which provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady operation all the heat from the heater is transferred to the water in the tube. If the system is to provide hot water at a rate of 8 L/min, determine the convection heat transfer coefficient and temperature at the inner surface of the pipe at the exit. Q2 a) Consider heat transfer to oil flow inside a copper pipe. Is the pipe length affecting the heat transfer rate into the oil? Briefly explain. b) Used engine oil can be recycled by a patented reprocessing system. Suppose that such a system includes a process during which engine oil flows through a…
Heat Transfer Question is image part iii) ?
1. The operations of the industrial management plant where you work asks you to determine the length of a 2.0 cm diameter pipe that will be used to heat water from an inlet temperature of 20.0°C to an outlet temperature of 60.0 °C The operational flow of water in the pipe is to be 0.6 m/s, and the surface temperature of the wall is to be kept constant at 90.0°C by condensing steam. For the development of this task, you must obtain the properties of water at the average temperature of the fluid. To determine the forced convection heat transfer coefficient use the correlation: Nu = 0.023Re0.8p₁.0.4