The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is - 5°C. The outside wall temperature is___________________?
Correct answer: C. 35°C
- A. 25°C
- B. 30°C
- C. 35°C
- D. 40°C
Explanation
From Fourier’s law, q = KΔT/L, so the temperature difference is 10 × 0.16/0.04 = 40°C. Since the inside is −5°C and heat flows inward, the outside temperature is −5 + 40 = 35°C.
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