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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The temperature of a gas stream is measured by a thermocouple whose junction can be approximated as a 1-mm-diameter sphere. Take the junction’s properties as: k of 32 W/m K, density of 8.2 kg/m^3, c of 300 J/Kg K. On its surface, the overall heat transfer coefficient is 200 W/m^2 K. Neglect any conduction loss from the sphere to other parts of the thermocouple. Create a plot of measurement error as a function of time for the thermocouple.
A cylindrical storage tank with diameter of 4m and a length of 10 m will hold a fluid whose temperature must be maintained at 347k. in order to size the heater required for the tank the following worst-case scenario is considered:
Ambient temperature=-20
wind speed=20m/s
tank wall temperature=347k
what size (kW) heater will be needed?
The temperature of a gas stream is measured by a thermocouple whose junction can be approximated as a 1-mm-diameter sphere. Take the junction’s properties as: k of 32 W/m K, density of 8.2 kg/m^3, c of 300 J/Kg K. On its surface, the overall heat transfer coefficient is 200 W/m^2 K. Neglect any conduction loss from the sphere to other parts of the thermocouple. Create a plot of measurement error as a function of time for the thermocouple, expressed as a fraction of the initial temperature difference.
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- Using Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal resistances of a unit area for convection between a surface and various fluids.arrow_forwardThe heat transfer rate from hot air by convection at 100C flowing over one side of a flat plate with dimensions 0.1m0.5m is determined to be 125 W when the surface of the plate is kept at 30C. What is the average convection heat transfer coefficient between the plate and the air?arrow_forward2.38 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.arrow_forward
- An oil radiator has an outside surface area of 0.18 m2 and operates at a surface temperature of 85 degree Celsius. If air moves over the surface of the radiator at a temperature of 16 degree Celsius and gives rise to a heat transfer coefficient equal to 38.25 W/(m2-K). Find out the heat transfer flux? O 2923 W/m2 O 3801 W/m² O 2639 W/m² O 1659 W/m²arrow_forwardQuestion:- A cylindrical steel tank with a diameter of 3 m and height of 4.4 m is used to store chilled water (at 9.3 °C) as part of an air conditioning system for a building. The heat transfer (convection) co-efficient for the surface of the tank in contact with the water in this application is 15 W/(m2.K). Given the surface temperature of the metal tank is 40 °C. At what rate must heat energy be removed from the water just to maintain its temperature constant at 9.3 °C ? Assume the tank is an enclosed cylinder and that the tank is always full. Note - the thickness of the tank is not relevant to this problem. Work in base SI units.arrow_forwardAn isolating wall (made up of 2-10mm thick plywood with 5mm woven silica sheet in between) encloses a steam-room to prevent the outside area from having the same temperature as the inside of the room. If the total area of the wall is 100 sq.m. and coefficient of thermal conductivity (k) for plywood and silica sheets are 0.12 and 0.015 W/mK respectively, what is the rate of heat transfer if the inside temperature is 800 °C while the outside is 42°C? answer must be in Wattsarrow_forward
- An isolating wall (made up of 2-10mm thick plywood with 5mm woven silica sheet in between) encloses a steam-room to prevent the outside area from having the same temperature as the inside of the room. If the total area of the wall is 100 sq.m. and coefficient of thermal conductivity (k) for plywood and silica sheets are 0.12 and 0.015 W/mK respecțively, what is the rate of heat transfer if the inside temperature is 800 °C while the outside is 42°C? answer must be in Watts * Your answerarrow_forwardA transparent film will be glued onto an upper surface of a solid plate within a heated chamber. For common gluing, the temperature between the glue, a film and the solid board must be kept at 70 °C. The transparent film has a thickness of 1 mm and thermal conductivity 0.05 W/mK, while the solid board is 13 mm thick. thickness and thermal conductivity of 1.2 W / mK. Inside the climate chamber, the convection heat transfer coefficient is 70 W/m²K. The bottom surface of the solid plate is kept at 52 °C, determines the temperature inside the heated chamber and the temperature of the surface of the transparent film. Assume negligible thermal contact resistance.arrow_forwardThe building is in an environment of 30 ° C. The walls are covered with an insulating layer of 4 cm thickness whose thermal conductivity is 1.8 W / (m K), and the temperature of the inner wall of the insulation is 320 ° C. Wall heat loss to the environment occurs by convection. Calculate the convection heat transfer coefficient value on the outer surface of the insulation to ensure that the outer surface temperature does not exceed 40 ° C. Convection coefficient = AnswerW / m² ° C.arrow_forward
- Steam is being transported in a pipe at a chemical production facility in Gebze, Kocaeli. Theouter diameter of the pipe is 8 cm, and the surrounding air temperature is 20 °C. On the surface of thepipe, the combined heat transfer coefficient is 35 W/m2*K. The surface temperature of the pipe is 150 °C.Steady-state conditions exist.(a) What is the rate of heat loss from the pipe to the surroundings?(b) The power used to generate the steam is obtained from natural gas. Perform an online search forapproximate values of the calorific value of natural gas, as well as the cost of natural gas per cubicmeter, and estimate the financial loss due to heat loss from this steam pipe within a period of oneyear. Indicate your sources clearly in your answer.arrow_forward3 Brass cube "p = 8530 kg/m , c= side length =9 mm, are annealed by heating them first to 813°C in a furnace and then allowing them to cool slowly to 130°C in ambient air at 28°C. If the average heat transfer coefficient is 19.9 W/m .°C, If 2204 balls are to be annealed per hour, what is the total rate of heat transfer (watts) from the balls to the ambient air? 380 J/kg.°C, k = 110 W/m.°C, a = 33.9E-6 W/m.°C",arrow_forwardAnswerCalculate the total resistance (in K/W ) through the vertical walls of a boiler furnace 20 m in area. The walls are constructed from aninner fire brick wall 30 cm thick of thermal conductivity 0.4 W/mK, a 5 mm thick steel protective layer of thermal conductivity 0.055kW/mK and a layer of ceramic blanket insulation of thermal conductivity 0.2 W/mK at 8 cm thickness. The inside temperature of thefire bricklayer was measured at 600 C and the temperature of the outside of the insulation 60 C.arrow_forward
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