Question

The temperature profile in a composite wall is as follows: 92 91 с 93 A B X A) Compare the magnitude of qı with q2 and 92 with 93 B) Compare the magnitude of kA with kg and kb with kc. Use the relevant formula(s) to support your answers.

Answer 1

60%! - Givеи Терел | und pто е Tл А. > Фа А B Ү, А) X3 X Using Energy balance equation @tu + 89 — 9 ося Istored - Igen so, of stored to din - Gout Нелсе, 9 = ч. = 3 B) from fourrer Heat transfer Equation 9 = K AdT For A part वर di no कर 1 k; 00 9 = KACO) - k= 0) Kя іѕ hаvg 119 1/4 . means

For 1<о 4 кв. B part 44 = kgя ат da не от is Quadrid aheally decreasing वर -- Kg is small compared to KA 1 « Also, for past e Kc AdT оқ. Iu this In linearly decreasing but not decreasing rate is от цел е блирал од Но Роле В. "key kn) Hence relation КА, 100, ko १ 19 ay КА. 7 ke 7 Кр