Humidification process on a psychrometric chart is represented by

Question

Consider two infinitely long fins made of the same material and exposed to the same convective environment. One fin has a square cross-section of side $a$, and the other has a circular cross-section of diameter $d$. Assume $a = d$. The ratio of the steady-state heat transfer rate from the square fin to that from the circular fin, $\frac{\dot{Q}_{\text{square}}}{\dot{Q}_{\text{circular}}}$, is:

Answer 1

1. Understanding Chart Axes:

• Horizontal Axis (X-axis): Represents the Dry Bulb Temperature (DBT). Moving right indicates heating; moving left indicates cooling.

• Vertical Axis (Y-axis): Represents the Specific Humidity ($\omega$) or moisture content. Moving up indicates adding moisture; moving down indicates removing moisture.

2. Analyzing the Humidification Process:

Humidification is defined as the process of increasing the moisture content of the air without changing its dry bulb temperature.

• Because the temperature is constant, there is no horizontal movement on the chart.

• Because moisture is being added, the specific humidity increases, causing movement strictly along the vertical axis.

• Therefore, the process is represented by a

vertical line moving upward.

3. Contrast with Other Processes:

• Dehumidification: Vertical line moving downward.

• Sensible Heating: Horizontal line moving toward the right.

• Sensible Cooling: Horizontal line moving toward the left.

Humidification process on a psychrometric chart is represented by

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The Correct Option is D

Solution and Explanation

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