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A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation?
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A polished metal pipe 5 cm outside diameter and 370 K temperature at t...
Introduction
To determine the overall coefficient of heat transfer for the polished metal pipe, we consider both convection and radiation. The overall heat transfer coefficient (U) can be calculated using the following relationship:
Parameters Given
- Outside Diameter of the Pipe: 5 cm (0.05 m)
- Outer Surface Temperature (T1): 370 K
- Ambient Temperature (T2): 295 K
- Emissivity (ε): 0.2
- Convection Coefficient (h): 11.35 W/m²·K
Step 1: Calculate the Convective Heat Transfer Coefficient (h)
- The convective heat transfer is given directly as 11.35 W/m²·K.
Step 2: Calculate the Radiative Heat Transfer Coefficient (hr)
- The radiative heat transfer coefficient can be calculated using the formula:
hr = ε * σ * (T1² + T2²) * (T1 + T2) / (T1 - T2)
Where σ (Stefan-Boltzmann constant) is approximately 5.67 x 10^-8 W/m²·K⁴.
- Plugging in the values:
hr = 0.2 * 5.67 x 10^-8 * (370² + 295²) * (370 + 295) / (370 - 295)
Step 3: Calculate the Overall Heat Transfer Coefficient (U)
- The overall heat transfer coefficient combines both convection and radiation:
1/U = 1/h + 1/hr
- After calculating hr, substitute the values into the equation to find U.
Conclusion
By following the above steps, you can accurately calculate the overall coefficient of heat transfer for the polished metal pipe, taking into account both convection and radiation effects.
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A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation?
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A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation?.
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