Engineering, 21.09.2019 03:30, amanda7835
A10-in-thick., 30-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k = 0.40 btu/h·ft·°f) of cross section 7 in × 7 in, or identical size bricks withnine square air holes (k = 0.015 btu/h·ft·°f) that are 9 inlong and have a cross section of 1.5 in× 1.5 in . there isa 0.5- in-thick plaster layer (k = 0.10 btu/h·ft·°f) between twoadjacent bricks on all four sides and on both sides of the wall. the house is maintained at 80°f and the ambient temperature outside is35°f. taking the heat transfer coefficients at the inner andouter surfaces of the wall to be 1.5 and 6 btu/h·ft2·°f. respectively, determine the rate of heat transfer through the wall constructed of(a) solid bricks and (b) bricks with air holes.
Answers: 2
Engineering, 04.07.2019 18:20, miguel454545
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
Engineering, 04.07.2019 19:10, nbunny7208
What is the chief metrological difference between measuring with a microscope and with an electronic comparator? a. the microscope is limited to small workpieces. a. the microscope is limited to small workpieces. c. the comparator can only examine one point on the workpiece. d. the microscope carries its own standard.
Answers: 1
A10-in-thick., 30-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k...
Social Studies, 09.11.2019 19:31
English, 09.11.2019 19:31
History, 09.11.2019 19:31
Mathematics, 09.11.2019 19:31
Chemistry, 09.11.2019 19:31
History, 09.11.2019 19:31