In one stage of an annealing process, 304 stainless steelsheet is taken from 300 K to 1250 K as it passes through an electrically healed oven at a speedof V s = 10 mm / s . The sheet thickness and width are t s = 8 mm and W s = 2 m , respectively, while theheight, width, and length of the oven are H o = 2 m , W o = 2 . 4 m , and L o = 25 m . respectively. The top andfour sides of the oven are exposed to ambient airand large surroundings, each at 300 K, and the corresponding surface temperature, convection coefficient,and emissivity are T s = 35 0 K , h = 10 W / m 2 ⋅ K , and ∈ = 0.8 . The bottom surface of the oven is also at350 K and rests on a 0.5-m-thick concrete Pad whose base is at 300 K. Estimate the required electric powerinput, P e l e c to the oven.
In one stage of an annealing process, 304 stainless steelsheet is taken from 300 K to 1250 K as it passes through an electrically healed oven at a speedof V s = 10 mm / s . The sheet thickness and width are t s = 8 mm and W s = 2 m , respectively, while theheight, width, and length of the oven are H o = 2 m , W o = 2 . 4 m , and L o = 25 m . respectively. The top andfour sides of the oven are exposed to ambient airand large surroundings, each at 300 K, and the corresponding surface temperature, convection coefficient,and emissivity are T s = 35 0 K , h = 10 W / m 2 ⋅ K , and ∈ = 0.8 . The bottom surface of the oven is also at350 K and rests on a 0.5-m-thick concrete Pad whose base is at 300 K. Estimate the required electric powerinput, P e l e c to the oven.
In one stage of an annealing process, 304 stainless steelsheet is taken from 300 K to 1250 K as it passes through an electrically healed oven at a speedof
V
s
=
10
mm
/
s
. The sheet thickness and width are
t
s
=
8
mm
and
W
s
=
2 m
, respectively, while theheight, width, and length of the oven are
H
o
=
2
m
,
W
o
=
2
.
4 m
,
and
L
o
=
25 m
. respectively. The top andfour sides of the oven are exposed to ambient airand large surroundings, each at 300 K, and the corresponding surface temperature, convection coefficient,and emissivity are
T
s
=
35
0
K
,
h
=
10
W
/
m
2
⋅
K
,
and
∈
=
0.8
. The bottom surface of the oven is also at350 K and rests on a 0.5-m-thick concrete Pad whose base is at 300 K. Estimate the required electric powerinput,
P
e
l
e
c
to the oven.
A constant heat flux q = 200 W / m2 is applied to a circular section pipe with a diameter D = 50 mm and a length L = 8 m, and water flows at a flow of 0.01 kg / s under the pipe. The entrance temperature of the water to the pipe is 29 oC. Which of the following is the average fluid temperature at the outlet of the pipe (x = L) with the fluid transmission at 30 oC?
a. 39.21 oC b. 84,23 oC c. 66,59 oC D. 61.43 oC e. 83,28 oC
Imagine a plate 0.1 m long by 0.1 m wide at a temperature of 80 °C.
Water is passed over its surface at a speed of 0.1 m/s and 40°C. Calculate the heat dissipated by the plate. Assume the following properties of water at 60 °C: k= 0.651 W/mK, Pr=3.02 y v = 0.478 x 10-6 m²/s.
8. A coal fired steam boiler uses 3000 kg of coal per hour. Air required for combustion is 15.5 kg ofcoal at barometric pressure of 98.2 KPa. The flue gas has temperature of 285 degree Celsiusand an average molecular weight of 30. Assuming an ash loss of 11% and allowable gas velocityof 7.5 meters per second. Find the diameter of the chimney
9. The gas density is 0.75 kg per cubic meters and air density is of 1.15 kg per cubic meter. If thedriving pressure is 0.25 KPA. Determine the height of the chimney.
10. A powerplant situated at an altitude having an ambient air of 96.53 KPa and 23.88 degreeCelsius. Flue gases at a rate of 5.0 kg per second enter the stack at 200 degree Celsius andleaves at 160 degree Celsius. The flue gases gravimetric analysis are 18% CO2, 7% O2 and 75%N2. Calculate the height of the stack necessary for a driving pressure of 0.20 KPaKindly answer all please. Thank you
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.