301023 - Advanced Thermal and Fluid Engineering - Electric Devices Low - Design of the Fins - Engineering Report Writing Assessment Answer

Assessment Task:

301023: Advanced Thermal and Fluid Engineering Assessment Answer

Fins are popularly used to keep the temperature of electric devices low. This project is aimed to find out the best configuration of the fins as shown in Figure 1. Figure 2 is the design of the fins. The key parameters are:

The surface of the fins including the base releases heat of 100 W. It is assumed that the heat flux is evenly distributed along all the fins surfaces shown in Figure 2 (excluding the bottom surface). A fan is used to blow air into the inlet and it is assumed that the air velocity is constant in the inlet duct.

Assignment
 

1. If the airflow velocity at the inlet is 1 m/s and the air temperature is 20°C. The fins are parallel to the x-direction in Figure 1, find out which of the follow configuration leads to the lowest temperature on the fin:

a. The centres of the inlet and outlet ducts are 70 mm above the bottom.

b. The centres of the inlet and outlet ducts are 850 mm above the bottom.

c. The centres of the inlet and outlet ducts are 100 mm above the bottom.

2. Using the best height of the air duct found in question 1, find which of the following configuration has the lowest temperature on the fin:

a. The fines are parallel to the x-direction.

b. The fins are parallel to the y-direction.

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