A student performs two experiences, in experience 1 he extends his hand from the window while the car is moving. In experience 2 he immersed his hand in a stream of water. Knowing that the heat convective coefficient of air is 100 W/m^2.K and the heat convective coefficient of water is 1000 W/m^2.K. The skin temperature is assumed to be 33 C and both water and air are at 10 C. Determine in which experience he felt cooler. a. Experience 1 b. Both experiences provide the same feeling c. Experience 2 Clear my choice
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- Q1: (5pt) In a cylindrical fuel element for a gas-cooled nuclear reactor, the generation rate of thermal energy within the fuel element due to fission can be approximated by the relation q(1) W/m³ %3D where a is the radius of the fuel element and is constant.The boundary surface at r = a is maintained at a uniform temperature Tɔ. (a) Assuming one-dimensional, steady-state heat flow, develop a relation for the temperature drop from the centreline to the surface of the fuel element. (b) For a radius of a = 30 mm, the thermal conductivity k = 10 W/(m °C) and qo = 2 x 107 W/m³, calculate the temperature drop from the centreline to the surface. 02: (5pt)For a water flow over a steel surface, the temperature of water at a specific location was found to change with the vertical distance from the surface (y) up to a distance of 0.015 m as T(y) = 60 + 20y + tan(y), where temperature is in °C and y is in cm. The surface temperature and ambient temperature was measured as 60°C and 105°C, respectively. The thermal conductivity of steel and water are, respectively, 48 W/m-K and 0.6 W/m-K. What is the local convection coefficient at this location?6 In a boiler test, the following observations wcre made: 358 A Text Book of Thermal Engineering Feed water temperaturç e= 12" C; Pressure of steam = 11 bar; Dryness fraction of steam 095 Mass of coal burnt 300 kg/h, Calorific value of coal 32 000 kJkg of coal; Mass of water supplied to boiler in 7 hrs 14 min= 14 625 kg. The mass of w ster in the boiler at the end of the test was less than that at the commencement by 900kg. Calculate I. Actual evaporation per kg of coal: 2 Equivalent evaporation from and at 100 C per kg [Ans. 7 15 kg, 8 33 kg: 58.75 % of coal ; and 3. Thermal efficiency of the boiler
- Q5Two large containers A and B of the same size are filled with different fluids. The fluids in containers A and B are maintainedat 0° C and 100° C, respectively. A small metal bar, whose initial temperature is 100° C, is lowered into container A. After1 minute the temperature of the bar is 90° C. After 2 minutes the bar is removed and instantly transferred to the othercontainer. After 1 minute in container B, the temperature of the bar rises 10°. How long, measured from the start of theentire process, will it take the bar to reach 99.9° C?What refrigeration capacity in TOR is required to cool 2000 cfm of air from 85°F to 70°F? If the specific heat ratio (k) and specific gas constant (R) of air are 1.4 and 0.28708 kJ/kg-K, respectively.Uwjssj last one mcq solve it ok
- 43% uo 7:52 * ZAIN IQ I. sheet No.3.pdf Homework 01-03 -2021 one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall. Q4/ Steam at Te1-320°C flows in a cast iron pipe (k=80W/m.°C) whose inner and outer diameters are D =5cm, and D=5.5cm, respectively. The pipe is covered with 3 cm thick glass wool insulation with k=0.05W/m.°C. Heat is lost to the surroundings at T02=5°C_by natural convection and radiation, with a combined heat transfer coefficient to be h,=18W/m.C. Taking the heat transfer coefficient inside the pipe to be h,=60W/m.C, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drops across the pipe shell and the insulation. 05/ Determine the overall heat transfer coefficient U based on the outer surface of a D=2.5cm, and D=3.34 cm steel pipe (k=54.0W/m.°C) for the following conditions: inside and outside heat transfer coefficients are 1200W/m."C. and 2000W/m."C…Problem 3: Insulation To=1 Toowwww Steam Tx2 T₂ T3 www www R₁ R₁ R₂ www.T R₂ Steam at Tx1 = 320 °C flows in a cast iron pipe (k = 80 W/m. °C) whose inner and outer diameters are 5 cm = 0.05 m and D₂ = 5.5 cm = 0.055 m, respectively. The pipe is covered with 3-cm-thick glass wool insulation with k = 0.05 W/m. °C. Heat is lost to surroundings at T2 = 5 °C by natural convection and radiation, with a combined heat transfer coefficient of h₂ = 18 W/m². °C. Taking the heat transfer coefficient inside the pipe to be h₁ = 60 W/m². °C, determine the temperature drops across the pipe and the insulation. The determination is based on a unit length of the pipe (L = 1 m). Assumptions 1. Heat transfer is one-dimensional since there is no indication of any change with time. 2. Heat transfer is one-dimensional since there is thermal symmetry about the centreline and no variation in the axial direction. 3. Thermal conductivities are constant. 4. The thermal contact resistant at the interface is…please very urgent i need the right answer please carfully
- The local heat transfer coefficient of a flat plate that is obtained experimentally is equal to 9x^2+2ax+B. If the length of the plate is equal to 10 m. Determine the value of the average heat flux between the plate at 20 C and the air that is at 10 C. a = 4w/m^3.k and B is equal to 10W/m^2.k Select one: O a. 2890 W/m^2 O b. 3720 W/m^2 O c. 3500 W/m^2 O d. 1680 W/m^2Water enters a tube at 29°C with a flow rate of 460 kg/h. The rate of heat transfer from the tube wall to the fluid is given as qs′(W/m)=ax, where the coefficient a is 25 W/m2 and x(m) is the axial distance from the tube entrance. (a) Beginning with a properly defined differential control volume in the tube, derive an expression for the temperature distribution Tm(x) of the water. (b) What is the outlet temperature of the water for a heated section 31 m long? (c) Sketch the mean fluid temperature, Tm(x), and the tube wall temperature, Ts(x), as a function of distance along the tube for fully developed and developing flow conditions. (d) What value of a uniform wall heat flux, qs″ (instead of qs′=ax), would provide the same fluid outlet temperature as that determined in part 8.13b? For this type of heating, sketch the temperature distributions requested in part 8.13c.Give an example of application of the Oth law of thermodynamics in everyday life. List explicitly Systems 1, 2, and 3 and what is the purpose of them being at the same temperature.