0.6 m मोटाई की एक समतल दीवार में स्थिर-अवस्था ऊष्मा चालन पर विचार करें। दीवार का सामान्य क्षेत्रफल 1.5 m2 है और यह 0.4 W/m°C तापीय चालकता वाली सामग्री से बनी है। दीवार के अंदर तापीय ऊर्जा का कोई उत्पादन नहीं होता है। दोनों पक्षों का तापमान 800°C और 300°C है। दीवार का तापीय प्रतिरोध कितना है?

This question was previously asked in
BHEL ET Mechanical Held on May 2019
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  1. 1.5 W/°C 
  2. 1 W/°C 
  3. 1.5 °C/W 
  4. 1 °C/W 

Answer (Detailed Solution Below)

Option 4 : 1 °C/W 
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Detailed Solution

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Concept:

Thermal resistance of the wall is given by

where L = thickness of the wall, K = thermal conductivity, A = surface area of wall

Calculation:

Given:

Inner wall temperature = 800°C, Outer wall temperature = 300°C, L = 0.6 m, K = 0.4 W/m.°C, A = 1.5 m2

Thermal resistance is:

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