Question

13.15 The base plate of an ironi (provided by resistance over a base plate cros plate of an iron is 0.6 cm thick. The plate is subjected to 100 W of power ded by resistance heaters inside the iron, as shown in Figure P13-15). base plate cross-sectional area of 250 cm, resulting in a uniform flux rated on the inside surface. The thermal conductivity of the metal base generated on th is k = 20 W/m- C. The outside ambient air temperature is 20°C with plate is k 20 transfer coefficient of 20 W/m - C at steady-state conditions. Assume one heat transfer coercent of 20 w/mº- dimensional heat transfer through the plate thickness le del the plate to determine the temperatures at the inner surface and inte one-third points.

Answer 1

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loow Am 13-15 7 a 0.6cm / h 2 3 4 Too 1. = 0 ha The m' R&P Rp = R2 = A R2 = To- Tao Rotat Prox2.5 = 0.012 Kw 1 se = 2 kw A=250 cm 20 X 0-025 ILO 00 = Ti-20 2 +0.012 = TI = 221.2 °C Tz = 220-8 °C 100 = Ti-Tz Rus here R23= Ritz Raq = R/ -0.00¢ - T3 100 = T 220.4°C 6 0.004 5 3 5 100 = 73-74 T4 = 220 °C 0.004