Question

A cylindrical can with an open end, A2, is shown below. For area A1, T1 = 1000K and ei = 0.40. Area Az is black with T3 = 500K. Area A2 is the open top of the can. It is open to a large room whose walls are at 300K. (a) Draw the thermal circuit for this problem and label all the resistances, nodes and heat flows. (b) Find F13 and ai CA21T Аз | H-20 сут - - P=1 = 10 cm

Answer 1

Answer:

Given that A cylindrical com with an open endr A2, is shown in below piguro area A, T,=1000k E, -0.40 Asea Az, T3 = 500k Cargo soom whose coalls are at 300k # Room A 8,0 = 100m Ez , Csince it is black surface) network Pos The network diagram of radiation Www ebes l D by o EA2 M AM 24 per Air .

calculating the shape factoo Fine F + F, 2 + F, 3 =0 Radiation from surface a to Etself we have zero shape factor :: Foro As surface (a) is free to the surrounding et nill also have 2000 drape factor (since(a) is rery large en compa rison with 183 .: F2 & F32 = 0 2) F, 3 = 0 1:13! semallarly heat sodiation foom surface (u to Q & also neglicable from the network diagram the heat radiation) flous from 0 to 6 ge has both surface radiation as wou as space resistance Cas shocon en network diagram by arrous) cu con esta og Al 6AI (29) + Cartia) . 5,64x108 (1000" 500") 1-0.4 - 1 8. 4X (DX (100) Tx100²) X1 het

- 5.64 x10 8 (9. 345x16") 7x00² ( 00 +1] 53156.285 (77x(10x103)2) 2.5 a 5.315625 2.5 radices must be converted to meters ass: 5.67x108 Nlik) q-2.12625 watts 19, -2.12625 watts) Answer: 2, +22.12625 watts.