Question

3. (25 points) Consider a rectangular plate 0.15 by 03 m, maintained at a uniform temperature of 80 °C, placed vertically in quiescent atmospheric air at 2C The emissivity of the plate is 0.8; the surrounding temperature is also at 24°C. Comute the heat transfer rate from the plate when the vertical height is 0.3. TABLE A.4 Thermophysical Properties of Gases at Atmospherie Pressure (K) Air (kg/ir) (kJkR.K) ov.sim) (mh) Nn.Ю 00 3.5562 1.032 50 2.3364 1.012 200 1.7458 1.007 250 1.3947 1.006 00 1.1614 1.007 2.54 a78 584 0758 03 0737 5.9 0720 22.5 0.707 71.1 103.4 132.5 159.6 184.6 15.89 263 2.00 4426 138 7 9.34 .590 181 11.44 22.3 9.9 0.700 38.3 0.690 30.0 33.8 350 0.9950 1.009 400 0.8711 1.014 20.92 26.41 208.2 230.1

Answer 1

Tean 80 124- 2. hean /6 - 0,825272 1,193 1353-29꾸 14-112.ナノ5.912- 그 29.92W