Question: T -45'C A copper wire (diameter = 2 mm) is coated with 1 mm thickness of an insulation material (k= 0.14 W/m.k). The Copper

T -45'C A copper wire (diameter = 2 mm) is coated with

T -45'C A copper wire (diameter = 2 mm) is coated with 1 mm thickness of an insulation material (k= 0.14 W/m.k). The Copper wire wire should dissipate an energy of 120 W to the air (h=45 W/m K) to keep a constant temperature for the whole wire. Answer questions Q21 to Q24 5m Q21 What is the temperature at the interface between the copper and insulation material (C)? (A) 164.2 (B) 52.3 (C) 148.8 (D) 96.7 (E) None of them Q22 What is the thickness of insulation to have a maximum heat transfer (mm)? (A) 3.2 (B) 6.3 (C) 3.1 (D) 2.1 Q23 What is the maximum heat transfer that can be dissipated from the copper wire (W)? (A) 183.2 160.3 (B) (C) 80.0 (D) 213.8 (E) None of them (D) 97.9 Q24 What is the minimum heat transfer that can be dissipated from the copper wire (W)? (C) 75.8 (B) 160.3 (A) 183.2 (E) None of them Instalation (E) None of them

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To answer the given questions we can use the concept of thermal resistance and the equation for heat transfer through a composite material The thermal resistance R can be calculated as R k A where is ... View full answer

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