Engineering, 05.02.2020 21:40, hervinlouis014
A5-m × 6-m × 8-m room is to be heated by an electrical resistance heater placed in a short duct in the room.
initially, the room is at 15°c, and the local atmospheric pressure is 98 kpa.
the room is losing heat steadily to the outside at a rate of 200 kj/min.
a 300-w fan circulates the air steadily through the duct and the electric heater at an average mass flow rate of 50 kg/min.
the duct can be assumed to be adiabatic, and there is no air leaking in or out of the room.
if it takes 13 min for the room air to reach an average temperature of 25°c, find
(a) the power rating of the electric heater
(b) the temperature rise that the air experiences each time it passes through the heater.
Answers: 1
Engineering, 03.07.2019 14:10, kayabwaller4589
When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point
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Engineering, 03.07.2019 14:10, volleyballfun24
If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.
Answers: 3
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