Convection Heat Transfer Rate in Electric Air Heater

How to calculate the rate of convection heat transfer from each strip in an electric air heater?

Given the data of an electric air heater, what factors influence the heat transfer rate from the first, fifth, and tenth strips?

What is the formula to calculate the rate of heat transfer from all the strips in the electric air heater?

Answer:

The rate of convection heat transfer from each strip of an electric air heater can be calculated using the formula: Q = h * A * ΔT, where Q is the rate of heat transfer, h is the convective heat transfer coefficient, A is the surface area of the strip, and ΔT is the temperature difference between the strip and the air.

Explanation:

The rate of convection heat transfer from each strip can be calculated using the formula:

Q = h * A * ΔT

Where Q is the rate of heat transfer, h is the convective heat transfer coefficient, A is the surface area of the strip, and ΔT is the temperature difference between the strip and the air.

For the first strip, it will encounter the full velocity of the air, resulting in a higher convective heat transfer coefficient (h) compared to the other strips. The rate of heat transfer from the first strip is given by:

Q1 = h1 * A * ΔT1

Similarly, the rates of heat transfer from the fifth and tenth strips can be calculated using the respective convective heat transfer coefficients h5 and h10. The rate of heat transfer from all the strips can be calculated by summing up the heat transfer rates from each strip.

Convection heat transfer is influenced by factors such as the velocity of the air, surface area of the strip, temperature difference between the strip and the air, and the convective heat transfer coefficient. Understanding these factors is crucial in determining the efficiency of heat transfer in electric air heaters.

By applying the formula and considering these factors, engineers and designers can optimize the performance of electric air heaters by enhancing the convection heat transfer rate from each strip.

For more detailed calculations and examples, refer to the provided data and equations in the context of the electric air heater scenario. Understanding the principles of convection heat transfer is essential for efficient thermal management in various applications.