Engineering
23.01.2022 05:58
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) An electrical heater 100 mm long and 5 mm in diameter is inserted into a hole
) An electrical heater 100 mm long and 5 mm in diameter is inserted into a hole drilled normal to the surface of a large block of material having a thermal conductivity of 5 W/m·K. Estimate the temperature reached by the heater when dissipating 50 W with the surface of the block at a temperature of 25°C.
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nyandog50
4,5(18 marks)
Th = 40.91 C
Explanation:
We must use the equation for heat current in conduction
Where k is the thermal conductivity of the material
A is the cross-sectional area
(Th -Tc) is the temperature difference
and L is the length of the material
Thus
Isolating Th, we have
Th = 40.91 C
RIZGT500
4,4(81 marks)
B. By shivering
Explanation:
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