A large diffuse surface has spectral absorptivity of a = 0.9 for 2 <1 jam and a = 0.2 for à 2 1 jam. The surface is insulated in the bottom, and exposed to two different conditions on the top: Insulated Insulated Case (2) Case (1) 6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffuse surface? Note that the sun emits approximately as a blackbody at 5800 K. Blakdy Radiation Function AT AT BLOKKE 6.40677 6516014 LAV 0000016 6.37820 LIND GOME AND 02134 BA33747 140 5300 BAWY70 LIND GOINTIK 5.40 GANTHO 0009341 6.300 5.000 230 6.JOH 6737418 0.140256 8.180130 6769234 0227997 8.273232 3.000 130 3,400 740 7:00 0403607 0443382 7NW BAINS 6-2) Case 1): The surface is exposed to the sun and G.= 1200 W/m². Flowing air temperature Te is 300 K. Assuming the surface temperature of 7,- 320 K, what is the convective heat transfer coefficient ? The unit of W/(m²K)

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Do 2,3
A large diffuse surface has spectral absorptivity of a=0.9 for 2 <1 jam and a=0.2 for 22
1 m. The surface is insulated in the bottom, and exposed to two different conditions on the
top:
sun
Insulated
Insulated
Case (2)
Case (1)
6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffuse
surface? Note that the sun emits approximately as a blackbody at 5800 K.
Blackbody Radiation Function
AT
AT
30
6.480677
63000
4300
0516014
600
0.000016
4000
0.379210
AND
6407554
0002134
6633747
140
5300
endy70
LND
001971
540
0.009341
5.400
0.301046
2000
5300
6.720178
230
0.066728
JOH
0.140256
ARD
6.737618
6.754140
8.180130
4227697
AND
6763199
925010
3.000
EXXION
330
0318302
6.819217
3,400
740
0.403607
7600
8.639102
7N0
6-2) Case 1): The surface is exposed to the sun and G. 1200 W/m². Flowing air temperature
Te is 300 K. Assuming the surface temperature of 7,- 320 K, what is the convective heat
transfer coefficient ? The answer should be given in the unit of W/(m²K).
9
Transcribed Image Text:A large diffuse surface has spectral absorptivity of a=0.9 for 2 <1 jam and a=0.2 for 22 1 m. The surface is insulated in the bottom, and exposed to two different conditions on the top: sun Insulated Insulated Case (2) Case (1) 6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffuse surface? Note that the sun emits approximately as a blackbody at 5800 K. Blackbody Radiation Function AT AT 30 6.480677 63000 4300 0516014 600 0.000016 4000 0.379210 AND 6407554 0002134 6633747 140 5300 endy70 LND 001971 540 0.009341 5.400 0.301046 2000 5300 6.720178 230 0.066728 JOH 0.140256 ARD 6.737618 6.754140 8.180130 4227697 AND 6763199 925010 3.000 EXXION 330 0318302 6.819217 3,400 740 0.403607 7600 8.639102 7N0 6-2) Case 1): The surface is exposed to the sun and G. 1200 W/m². Flowing air temperature Te is 300 K. Assuming the surface temperature of 7,- 320 K, what is the convective heat transfer coefficient ? The answer should be given in the unit of W/(m²K). 9
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