Engineering, 11.09.2019 03:30 kingcory717
Consider a 320 mm × 320 mm window in an aircraft. for a temperature difference of 80°c from the inner to the outer surface of the window, calculate the heat loss through l= 10-mm-thick polycarbonate, soda lime glass, and aerogel windows, respectively. the thermal conductivities of the aerogel and polycarbonate are kag= 0.014 w/m·k and kpc= 0.21 w/m·k, respectively. evaluate the thermal conductivity of the soda lime glass at 300 k. if the aircraft has 110 windows and the cost to heat the cabin air is $1/kw·h, compare the costs associated with the heat loss through the windows for an 8-hour intercontinental flight.
Answers: 1
Engineering, 04.07.2019 18:10
Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines
Answers: 1
Engineering, 04.07.2019 18:10
Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?
Answers: 3
Engineering, 04.07.2019 18:10
Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
Answers: 1
Engineering, 04.07.2019 19:10
10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.
Answers: 2
Consider a 320 mm × 320 mm window in an aircraft. for a temperature difference of 80°c from the inne...
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