Question

h The doctor industrial gas tumace a 2 mx 4 m in sartice area and is to be insulated to reduce heat loss to no more a 1200 W . The door issonn schemat ically in F. 1.32. The interior surface is 23/8-1-thick Inconel on sheet, and the outer surface is 1/sin-thick sheet of saless steel 310. Beween these metal ilable thickness of inb r al is to be pecul The Times un peale nile lumis Crd the walls culticieni belen the and the car is - Wim Theol for in the ouerfice of the door de su mu dis i -SW' KS suitable insulatii maral and size its thickness. FIGURE 132 Cross section of composite wall of furnace door

Answer 1

Friday, April 17, 2020 8:00 AM Inner outer - - Insulation ---- - - --- air = 20c Tin=1206c -- ----- ----- h = 5 2K i k3 kz -- 1 U-20 W/m2K kry k* er so referen (e) - Given not given Hux QE 1200 W/m2 ! conductivity (taken from 21= 2 incha 3 42.5 4X10² m = 0.009525m ! i Inconel 600, k, = 14.9 W/mk X=? : ss 310, kg = 11 W/mk xg-Iinch= 2x2.54x10 m = 0.00635 m kg=3 cn- → Now heat flux (W/m2) will be given by Qq - Tin- Tair = II km² h - w = W mak

280 = 0 - ੦) 0 ੦੦ 65 . 6.00੧55 k m2 * m2 0018 0.00 6 ) । \ W k m2 1130 42 0,00੧550,0 625 4.9 \_ 29 3 ) n 902 .2C - 5,12 3 0.2 k .

For reference:

→ We can decide insulation from above ean where 34= thickness of insulation - K2= conductivity of insulation - e.g. If we tak ceramic, generally having K= 0.15 work X2=0.73212 X 0.15 =0.1098 m x =10098 cm

Stainless Steel - Grade 310 (UNS S31000) Property Minimum Value (S.I.) Units (S.I.) Melting Point 1673 Minimum Service Temperature 0 Specific Heat 490 J/kg.K Thermal Conductivity 11 W/m.K 23 more rows

Special Metals INCONEL Alloy 600 Physical Properties Metric English Thermal Properties CTE, linear 20°C 13.3 pm/m-°C 7.39 pin/in-°F Specific Heat Capacity 0.444 J/g-°C 0.106 BTU/5-F Thermal Conductivity 14.9 W/m-K 103 BTU-in/hr-ft-°F 19 more rows

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