Two nested spherical tanks with the internal and outerdiameters of the 100 cm by 104 cm and 114 cm by 118 cm isused to store hot water at 100 C. Both tanks are made of boronfiber epoxy with different composite compositions. Thethermal conductivity of the inner tank is 1.5 W/m K while theouter tank has a thermal conductivity of 0.5 W/m K. The gapbetween the tanks is filled with air (use properties of air at50°C). The tank is located in an open environment at 0'C. Theouter surface of the tank is white painted and heat transferbetween the outer surface of the tank and the surrounding isby natural covection and radiation. The convection heattransfer coefficient at the inner and the outer surface of thepipe is h 20 W/m' K and h 10 W/m K. Determine;a. the rate of heat loss from the tankb. the inside, outside and intermediate surface temperatures.Hint: Take the outer surface temperature as 3°C for radiationcalculations. TABLE A-15Properties of air at 1 atm pressureDynamicViscosityµ, kg/m-sKinematicPrandtlSpecificHeatThermalThermalTemp.T, °CConductivityk, W/m-KDensityDiffusivityViscosityv, m?/sNumberP, kg/m³Cp, J/kg-Ka, m?/sPr-150-1008.636 x 10-61.189 x 10-52.8669830.011714.158 x 10-63.013 x 10-60.72468.036 x 10-61.252 x 10-51.356 x 10-51.465 x 10-51.578 x 10-51.696 x 10-52.0389660.015825.837 x 10-60.72630.019790.02057-501.5829991.474 x 10-59.319 x 10-60.74401.527 x 10-51.579 x 10-51.630 x 10-51.680 x 10-51.729 x 10-51.754 x 10-51.778 x 10-51.802 x 10-51.825 x 10-51.849 x 10-51.872 x 10-5-40-301.5141.451100210041.008 x 10-51.087 x 10-50.74360.74250.74080.021340.022110.02288-201.39410051.169 x 10-5-101.34110061.252 x 10-50.73871.29210060.023641.818 x 10-51.338 x 10-50.73621.880 x 10-51.944 x 10-52.009 x 10-52.074 x 10-52.141 x 10-52.208 x 10-51.26910060.024011.382 x 10-50.73501.2461.2251010060.024391.426 x 10-50.73361510070.024761.470 x 10-50.73231007100710071.516 x 10-51.562 x 10-51.608 x 10-51.655 x 10-5201.2040.025140.7309251.1840.025510.7296301.1640.025880.7282351.14510070.026252.277 x 10-51.895 x 10-50.72682.346 x 10-52.416 x 10-52.487 x 10-52.632 x 10-52.780 x 10-52.931 x 10-51.702 x 10-51.750 x 10-51.798 x 10-5401.12710070.026621.918 x 10-50.72551.1090.026991.941 x 10-51.963 x 10-545100710070.7241501.0920.027350.72280.028080.028812.008 x 10-52.052 x 10-52.096 x 10-51.896 x 10-51.995 x 10-52.097 x 10-52.201 x 10-5601.05910070.72021.0280.99947010070.71770.029530.71540.713280100810083.086 x 10-53.243 x 10-53.565 x 10-52.139 x 10-52.181 x 10-52.264 x 10-52.345 x 10-5900.97180.030241000.945810090.030952.306 x 10-50.71111200.70730.70410.897710110.032352.522 x 10-50.85420.81482.745 x 10-52.975 x 10-514010130.033743.898 x 10-54.241 x 10-54.593 x 10-54.954 x 10-55.890 x 10-56.871 x 10-57.892 x 10-52.420 x 10-52.504 x 10-52.577 x 10-52.760 x 10-52.934 x 10-516010160.035110.70141800.7788101910230.036463.212 x 10-50.69922000.74590.037793.455 x 10-50.69740.674625030010330.041044.091 x 10-50.69464.765 x 10-55.475 x 10-50.615810440.044180.69353.101 x 10-53.261 x 10-53.415 x 10-53.563 x 10-53.846 x 10-53500.566410560.047210.69376.219 x 10-56.997 x 10-57.806 x 10-59.515 x 10-58.951 x 10-51.004 x 10-41.117 x 10-41.352 x 10-41.598 x 10-41.855 x 10-42.122 x 10-42.398 x 10-43.908 x 10-45.664 x 10-40.69480.69654000.524310690.050154500.488010810.052985000.456510930.055720.69866000.404211150.060930.70374.111 x 10-54.362 x 10-57000.362711350.065811.133 x 10-40.70921.326 x 10-41.529 x 10-48000.328911530.070370.71499000.300811690.074654.600 x 10-50.7206100015004.826 x 10-55.817 x 10-56.630 x 10-50.277211840.078681.741 x 10-40.72600.095992.922 x 10-44.270 x 10-40.199012340.747820000.155312640.111130.7539Note: For ideal gases, the properties C, k, µ, and Pr are independent of pressure. The properties p, v, and a at a pressure P (in atm) other than 1 atm are determinedby multiplying the values of p at the given temperature by Pand by dividing v and a by P.

Heat transfer through composite sphere Lets, Q = Heat transfer rate th = Temperature of hot fluid…

Two nested spherical tanks with the internal and outer diameters of the 100 cm by 104 cm and 114 cm by 118 cm is used to store hot water at 100°C. Both tanks are made of boron fiber epoxy with different composite compositions. The thermal conductivity of the inner tank is 1.5 W/m K while the outer tank has a thermal conductivity of 0.5 W/m K. The gap between the tanks is filled with air (use properties of air at 50°C). The tank is located in an open environment at 0'C. The outer surface of the tank is white painted and heat transfer between the outer surface of the tank and the surrounding is by natural covection and radiation. The convection heat transfer coefficient at the inner and the outer surface of the pipe is h= 20 W/m' K and h,= 10 W/m K. Determine ; a. the rate of heat loss from the tank b. the inside, outside and intermediate surface temperatures. Hint: Take the outer surface temperature as 3°C for radiation calculations.

Two nested spherical tanks with the internal and outer diameters of the 100 cm by 104 cm and 114 cm by 118 cm is used to store hot water at 100°C. Both tanks are made of boron fiber epoxy with different composite compositions. The thermal conductivity of the inner tank is 1.5 W/m K while the outer tank has a thermal conductivity of 0.5 W/m K. The gap between the tanks is filled with air (use properties of air at 50°C). The tank is located in an open environment at 0'C. The outer surface of the tank is white painted and heat transfer between the outer surface of the tank and the surrounding is by natural covection and radiation. The convection heat transfer coefficient at the inner and the outer surface of the pipe is h= 20 W/m' K and h,= 10 W/m K. Determine ; a. the rate of heat loss from the tank b. the inside, outside and intermediate surface temperatures. Hint: Take the outer surface temperature as 3°C for radiation calculations.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A heater plate measures 40 cm x 40 cm in the tank and is kept at a constant temperature of 70 oC.Show the calculations in which case it can heat the oil at a temperature of 30 oC in the tank. For oil: ν=0.00026 m2 / s, k=0.15 W / mK, Pr=2900
A supply of 50 kg of chicken at 6degC contained in a box is to be frozen to -18degC in a freezer. Determine the amount of heat that needs to be removed. The latent heat of chicken is 247 kJ/kg and its specific heat is 3.32 kJ/kg-degC above freezing and 1.77 kJ/kg-degC below freezing. The freezing temperature of the chicken is -2.8degC
Consider a furnace (as a plane wall) which has a thickness of 15 cm and a surface area of 1 m?. The inside surface of the furnace wall (the hot left side of the wall) is at temperature T1. The furnace wall is made of brick with thermal conductivity of 1.198 W/m.K. The outside surface of the furnace wall (the right side of the wall) has a surface emissivity of 0.8 and is maintained at T2=101 °C and subject to air at 25 °C with convection heat transfer coefficient of 20 W/m?.K. The surroundings temperature at the outside of the furnace wall is at 25 °C. Required: Draw a clear and consistent schematic of the problem and label the operating conditions on the schematic. Perform systematic analysis, state your assumptions and justify the equation used and determine the following (circle your final answers): (i) The rate of heat transfer by convection (in W); (ii) The rate of heat radiation (in W); (iii) The surface temperature of the furnace wall T1 (in °C); (iv) The rate of conduction heat…
Consider a double-paned window consisting of two panes of glass, each with a thickness of 0.500 cm and an area of 0.795 m2 , separated by a layer of air with a thickness of 1.50 cm. The temperature on one side of the window is 0.00 ∘C∘C; the temperature on the other side is 21.0 ∘C∘C. In addition, note that the thermal conductivity of glass is roughly 36 times greater than that of air. Approximate the heat transfer through this window by ignoring the glass. That is, calculate the heat flow per second through 1.50 cmcm of air with a temperature difference of 21.0 ∘C∘C. (The exact result for the complete window is 25.6 J/sJ/s .)
A 20-cm diameter copper ball is to be heated from 110°C to an average temperature of 170°C in 90 minutes. Taking the average density and specific heat of copper in this temperature range to be p=8950 kg/m and Cp=0.395 kJ/kg • °C, respectively, determine the total amount of heat transfer to the copper ball in kj (Area of sphere: TID2; Volume of sphere=TTD/6)? A 88.64 kJ B 886.4 kl 78.84 kJ D 788.4 kJ
Thin walled Aluminum container that is 6 cm in diameter and 7 cm in high equipped with stirrer contain water submersed in hot engine oil at 60°C. If the oil was mixed by the stirrer and the heat transfer coefficient between the water and the glass is 120 W/m2. °C. Find the time needed for the water to heat up from 3°C to 38°C
A computer room located on the second floor of a five-story office building is 10m by 7 m. The exterior wall is 3.5 m high and 10 m long; it is a metal curtain wall (steel backed with 10 mm of insulating board), 75 mm of glass-fiber insulation, and 16 mm of gypsum board. Single-glazed windows make up 30 percent of the exterior wall. The computer and lights in the room operate 24 h/d and have a combined heat release to the space of 2 kw. The indoor temperature is 20 C. (a) If the building is located in Columbus, Ohio, determine the heating load at winter design conditions. (b) What would be the load if the windows were double-glazed?
The heat loss through the roof of a building is 32.4 kW during the winter, when the temperature and relative humidity inside the building are 22°C and 60% respectively, the temperature outside the building is -8°C, the dimensions of the ceiling are 12m x 25m. One of the engineers suggested adding a thermal insulator of thickness 2 cm to the roof so, the heating load from the ceiling reduced by half. Assume f-9.26 W/m. "C. Find: (a) Is the water vapor condenses on the inner surface of the roof before adding thermal insulator. (b) The thermal conductivity of the insulator, which proposed to add.
kindly help me with this question. Thank you, I am having a hard time solving this
A 1200 W electric resistance heating element whose diameter is 0.5 cm is immersed in 55 kg of water "ep 4.18 kJ/kg.K" initially at 20 C. Assuming the water container is well-insulated. What is the gutropy generated during this process, " kJ/K" when the surroundings are at T-15 C?
An electric device made of copper stands on an insulating carpet in a breezy room at 20°C. A fan is set in the room to ensure a continuous air circulation. Determine the total rate of heat transfer from the device if the average values of its exposed surface area and outer surface temperature are 2.5 m² and 30°C, respectively.