Engineering, 24.12.2019 05:31 veroushkarose7326
Aroom is to be heated by a coal-burning stove, which is a cylindrical cavity with an outer diameter of 50 cm and a height of 120 cm. the rate of heat loss from the room is estimated to be 1.5 kw when the air temperature in the room is maintained constant at 24°c. the emissivity of the stove surface is 0.85, and the average temperature of the surrounding wall surfaces is 14°c. determine the surface temperature of the stove. neglect the heat transfer from the bottom surface and take the heat transfer coefficient at the top surface to be the same as that on the side surface. the heating value of the coal is 30,000 kj/kg, and the combustion efficiency is 65 percent. determine the amount of coal burned in a day if the stove operates 14 h a day. evaluate air properties at a film temperature of 77°c and 1 atm pressure. is this a good assumption?
Answers: 2
Engineering, 03.07.2019 14:10
Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned
Answers: 2
Engineering, 04.07.2019 18:20
Wiy doeres rere okhn a pump whon working betwon the same pressure range?
Answers: 2
Engineering, 04.07.2019 18:20
For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor
Answers: 3
Engineering, 04.07.2019 19:20
At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2
Answers: 2
Aroom is to be heated by a coal-burning stove, which is a cylindrical cavity with an outer diameter...
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