Consider the three-surface enclosure shown. The lower plate ( A 1 ) is a black disk of 200-mm diameter and is supplied with a heat rate of 10,000 W. The upper plate ( A 2 ) , a disk coaxial to A 1 , is a diffuse, gray surface with ε 2 = 0.8 and is maintained at T 2 = 473 K . The diffuse, gray sides between the plates are perfectly insulated. Assume convection heat transfer is negligible. Determine the operating temperature of the lower plate T 1 and the temperature of the insulated side T 3 .
Consider the three-surface enclosure shown. The lower plate ( A 1 ) is a black disk of 200-mm diameter and is supplied with a heat rate of 10,000 W. The upper plate ( A 2 ) , a disk coaxial to A 1 , is a diffuse, gray surface with ε 2 = 0.8 and is maintained at T 2 = 473 K . The diffuse, gray sides between the plates are perfectly insulated. Assume convection heat transfer is negligible. Determine the operating temperature of the lower plate T 1 and the temperature of the insulated side T 3 .
Solution Summary: The author calculates the operating temperature of the lower plate and the insulated side.
Consider the three-surface enclosure shown. The lower plate
(
A
1
)
is a black disk of 200-mm diameter and is supplied with a heat rate of 10,000 W. The upper plate
(
A
2
)
, a disk coaxial to
A
1
, is a diffuse, gray surface with
ε
2
=
0.8
and is maintained at
T
2
=
473
K
. The diffuse, gray sides between the plates are perfectly insulated. Assume convection heat transfer is negligible.
Determine the operating temperature of the lower plate T1and the temperature of the insulated side T3.
Q In a test on a two.. strok, heavy oil, marine engine, the following observations were
made: Oil consumption, 4.05 kg/h; Calorific value of oil, 43000kj/kg; het brake
load 579N; Mean brake diameter, 1m; mean effective pressure 275 kN/m²; cylinder diameter
0.20m; stroke, 0.250m; speed, 360 rpm.
Calculate
the mechanical efficiency the indicated thermal efficiency Y
The brake thermal efficiency and the quantity of jacket water required per
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امتصت
minute if 30% of the energy supplied by the fuel is absorbed by this water.
Permissible rise in temperature is 20k and specific heat capacity of water-4.1868 kj
Answers [84.2%, 26-8%, 22.6%, 8.33 kg/min]
kg.k
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Q78 A four cylinder, four-stroke Petrol engine has a compression ratio of 6 to 1. A test on
this engine gave the following results;
Net brake load = 20 kg, effective brake arm = 0.5 m, indicated mep=6*105 N/m², engine
speed 2400 rpm, fuel consumption = 10 kg/h, Calorific value of the fuel = 44000kj/kg,
Cylinder bore 86 mm, engine stroke-100mm.
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Calculate: the mechanical efficiency, ⑥the brake thermal efficiency the relative
efficiency assuming the engine works on the Constant volume cycle and that 8-1.4 forair
⑧The brake mean effective pressure.
Answers 1 88.4%, 48/5-35 × 105 N/m² 1
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For the instant represented, crank OB has a clockwise angular velocity w = 1.22 rad/sec and is passing the horizontal position.
Determine the corresponding magnitudes of the velocity of the guide roller A in the 22° slot and the velocity of point C midway
between A and B.
15"
7
C. 32"
AO
22%
B
Answers:
VA =
VC =
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