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
Another question on Engineering
Engineering, 03.07.2019 23:20
Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct
Answers: 3
Engineering, 04.07.2019 18:10
Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way
Answers: 2
Engineering, 04.07.2019 18:20
Find the minimum film thickness for a journal bearing with the data below. shaft diameter, d-50 mm, clearance ratio, cdratio? 0.001, shaft speed, n 2000 rpm; bearing length. i 200 mm; eccentricity ration, ? -0.55. ( note, cdratio-ca/d) the minimum film thickness is um
Answers: 2
Engineering, 04.07.2019 19:10
Analyze the factors that influence the choice between the following pairs of processes to make the products indicated: i) sand casting versus die casting of an electric-motor housing ii) thread rolling versus machining of a bolt for high-strength application. (co3/c5)
Answers: 3
You know the right answer?
A5-m × 6-m × 8-m room is to be heated by an electrical resistance heater placed in a short duct in t...
Questions
Computers and Technology, 11.03.2020 05:37
Computers and Technology, 11.03.2020 05:38
Mathematics, 11.03.2020 05:38
Mathematics, 11.03.2020 05:38
Mathematics, 11.03.2020 05:38
