An electronic device with a temperature of 84°C (shown in golden colour) is embedded inside a composite plastic tube which is equipped with three fins (shown in blue) to enhance the convective heat transfer with the surrounding air. The composite tube is held horizontally. The temperature drop along the fins can be ignored due to their high thermal conductivity. The outer ring of the fins (shown in brown) is insulated. The ambient temperature is 20°C. 3a. Draw the thermal resistance circuit of the system 3b. Derive the energy balance of the system 3c. Find the thermos-physical properties of the air and aluminium 3d. Calculate the heat transfer coefficients across the cylinder 3e. Calculate the heat transfer coefficients across the fins by assuming fins as vertical planes 3f. Calculate the heat loss across the system
An electronic device with a temperature of 84°C (shown in golden colour) is embedded inside a composite plastic tube which is equipped with three fins (shown in blue) to enhance the convective heat transfer with the surrounding air. The composite tube is held horizontally. The temperature drop along the fins can be ignored due to their high thermal conductivity. The outer ring of the fins (shown in brown) is insulated. The ambient temperature is 20°C.
3a. Draw the thermal resistance circuit of the system
3b. Derive the energy balance of the system
3c. Find the thermos-physical properties of the air and aluminium
3d. Calculate the heat transfer coefficients across the cylinder
3e. Calculate the heat transfer coefficients across the fins by assuming fins as vertical planes
3f. Calculate the heat loss across the system
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