Water at 150 °C flows on the inside of a 1 meter long 2" Schedule 80 steel pipe (thermal conductivity k =43 W/m °C). The temperature of the air outside the steel pipe is 25 °C. The convection...


Answer A.S.A.P the class is Heat Transfer, please show all steps. Thank you.


Water at 150 °C flows on the inside of a 1 meter long 2

Extracted text: Water at 150 °C flows on the inside of a 1 meter long 2" Schedule 80 steel pipe (thermal conductivity k =43 W/m °C). The temperature of the air outside the steel pipe is 25 °C. The convection coefficient between water and pipe (hì) is 500 W/m2 °C. The convection coefficient between the pipe and outside air (ho) is 12 W/m2 °C. (a) Draw the equivalent electric circuit of the thermal resistance. (b) Calculate the heat transfer rate from the water to air. (c) Calculate the overall heat-transfer coefficient, U. (d) The pipe is covered with a layer of asbestos [k =0.18 W/m °C] while still surrounded by a convection environment with h = 12W/m2 °C. Calculate the critical %3| insulation radius to determine if the heat transfer rate will increase or decrease when the insulator layer is 0.05 mm thick.
Table A-11 | Steel-pipe dimensions.<br>Nominal<br>Metal<br>Inside cross-<br>pipe<br>Wall<br>sectional<br>sectional<br>size, in<br>OD, in<br>Schedule no.<br>Thickness, in<br>ID, in<br>in?<br>area, ft²<br>area,<br>1<br>8<br>0.405<br>40<br>0.068<br>0.269<br>0.072<br>0.00040<br>80<br>0.095<br>0.215<br>0.093<br>0.00025<br>0.540<br>40<br>0.088<br>0.364<br>0.125<br>0.00072<br>80<br>0.119<br>0.302<br>0.157<br>0.00050<br>0.675<br>40<br>0.091<br>0.493<br>0.167<br>0.00133<br>80<br>0.126<br>0.423<br>0.217<br>0.00098<br>1<br>0.840<br>40<br>0.109<br>0.622<br>0.250<br>0.00211<br>80<br>0.147<br>0.546<br>0.320<br>0.00163<br>1.050<br>40<br>0.113<br>0.824<br>0.333<br>0.00371<br>80<br>0.154<br>0.742<br>0.433<br>0.00300<br>1<br>1.315<br>40<br>0.133<br>1.049<br>0.494<br>0.00600<br>80<br>0.179<br>0.957<br>0.639<br>0.00499<br>1.900<br>40<br>0.145<br>1.610<br>0.799<br>0.01414<br>80<br>0.200<br>1.500<br>1.068<br>0.01225<br>160<br>0.281<br>1.338<br>1.429<br>0.00976<br>2<br>2.375<br>40<br>0.154<br>2.067<br>1.075<br>0.02330<br>80<br>0.218<br>1.939<br>1.477<br>0.02050<br>3<br>3.500<br>40<br>0.216<br>3.068<br>2.228<br>0.05130<br>80<br>0.300<br>2.900<br>3.016<br>0.04587<br>4<br>4.500<br>40<br>0.237<br>4.026<br>3.173<br>0.08840<br>80<br>0.337<br>3.826<br>4.407<br>0.7986<br>5.563<br>40<br>0.258<br>5.047<br>4.304<br>0.1390<br>80<br>0.375<br>4.813<br>6.122<br>0.1263<br>120<br>0.500<br>4.563<br>7.953<br>0.1136<br>160<br>0.625<br>4.313<br>9.696<br>0.1015<br>6.625<br>40<br>0.280<br>6.065<br>5.584<br>0.2006<br>80<br>0.432<br>5.761<br>8.405<br>0.1810<br>10<br>10.75<br>40<br>0.365<br>10.020<br>11.90<br>0.5475<br>80<br>0.500<br>9.750<br>16.10<br>0.5185<br>314<br>6.<br>

Extracted text: Table A-11 | Steel-pipe dimensions. Nominal Metal Inside cross- pipe Wall sectional sectional size, in OD, in Schedule no. Thickness, in ID, in in? area, ft² area, 1 8 0.405 40 0.068 0.269 0.072 0.00040 80 0.095 0.215 0.093 0.00025 0.540 40 0.088 0.364 0.125 0.00072 80 0.119 0.302 0.157 0.00050 0.675 40 0.091 0.493 0.167 0.00133 80 0.126 0.423 0.217 0.00098 1 0.840 40 0.109 0.622 0.250 0.00211 80 0.147 0.546 0.320 0.00163 1.050 40 0.113 0.824 0.333 0.00371 80 0.154 0.742 0.433 0.00300 1 1.315 40 0.133 1.049 0.494 0.00600 80 0.179 0.957 0.639 0.00499 1.900 40 0.145 1.610 0.799 0.01414 80 0.200 1.500 1.068 0.01225 160 0.281 1.338 1.429 0.00976 2 2.375 40 0.154 2.067 1.075 0.02330 80 0.218 1.939 1.477 0.02050 3 3.500 40 0.216 3.068 2.228 0.05130 80 0.300 2.900 3.016 0.04587 4 4.500 40 0.237 4.026 3.173 0.08840 80 0.337 3.826 4.407 0.7986 5.563 40 0.258 5.047 4.304 0.1390 80 0.375 4.813 6.122 0.1263 120 0.500 4.563 7.953 0.1136 160 0.625 4.313 9.696 0.1015 6.625 40 0.280 6.065 5.584 0.2006 80 0.432 5.761 8.405 0.1810 10 10.75 40 0.365 10.020 11.90 0.5475 80 0.500 9.750 16.10 0.5185 314 6.
Jun 10, 2022
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