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- (3) The thermal conductivity of helium at 400 K is 0.176 W m-! K-1. Knowing only this datum, estimate the thermal conductivity of helium at 800 K. Compare your estimate to the value obtained from the figure below. 06 as 02 01 co CO.N A HCI Cl, 200 400 00 Temperature, K 1200 1400 600 What do you conclude about the equation that you used for your estimate?Determine the heat conduction of a boiler if you are given the following data: The thickness of the boiler is 15 cm, the T1 is the temperature of the water is 25°C and the T2 of the steam is 110°C, the thermal conductivity The boiler material is iron (use presentation table), the boiler area is 4.5 m^2Thermal conductivity of solid metals with rise in temperature normally(A) Increases(B) Decreases(C) Remain constant(D) May increase or decrease depending on temperature.
- What happens to heat transfer per unit time in conduction heat transfer as thermal conductivity decreases?What is the difference between conduction and convection? (Choose TRUE or FALSE for each statement) Conduction occurs due to temperature gradient, while convection exists subjected to the both temperature and density differences. OTRUE O FALSE Conduction depends on the vibrated atoms in the medium, while convection depends on the atom separation in the medium. O TRUE O FALSE Conduction involves heat is transferred in one direction, while heat is circulated with convection. O TRUE OFALSEThermal conductivity is lower for (a) wood (b) air (c) water at 100°C (d)steam at 1 bar
- If we consider a flat sheet of iron at 300 K does not receive any radiation from its surroundings. The metal is 10 cm x 10 cm x 0.1 cm; the heat capacity is 25 J/K mol; the density is 7.86 g/cm3. After 20 minutes, what is the temperature of the metal plate? Ans. -54.15 Celsius Show solution.1.28 Determine the thermal conductivity of steam at 700 K and 1.327 x 10' N/m?. Ans 0.0505 W/m K (klk, = 1.0) 1.29 Delermine theWe performed the experiment to measure the thermal conductivity of 2 materials (Brass & Steel) in the laboratory and measured the following tabulated values: Material 1 - BRASS (Diameter = 25mm) Power Temperature (°C) Q' (W) 1 4 5 6 7 2 3 8. 9 14.7 79.1 77.6 75.9 50.2 46.4 42.4 36.1 34,4 33.5 Material 2 - STEEL (Diameter = 25mm) Power Temperature (°C) Q' (W) 1 2 3 7 8 9 14.25 88.5 87.4 84.9 34.1 33.4 32.4
- Please explain temperature dependence of thermal conductivity including interaction mechanism ?Choose the correct answer for heat: Select one: O a. Path Function O b. Intensive properties O C. Point Function O d. Extensive propertiesA pipe passes through a room in which the surrounding air is at 22 ºC. The diameter of the pipe is 200 mm, the length of the pipe is 3metersand its surface temperature is 250ºC and the emissivity of the surface is 0.9 What is the surface emissive power (radiation heat loss)? If convection heat transfer coefficient from the surface to the air is 20 W/m2.K, what is the rate of heat loss from the surface of pipe by convection? Total heat loss from the surface of the pipe per unit length