Heat Removed With Air

Overview

Engineering reference data for Heat Removed With Air in thermodynamics.

Key Formulas

First Law

$\Delta U = Q - W$

Energy is conserved — heat added minus work done.

Ideal Gas Law

$PV = nRT$

Relates pressure, volume, and temperature of an ideal gas.

Heat Transfer

$Q = mc\Delta T$

Sensible heat transfer.

Carnot Efficiency

$\eta = 1 - T_C/T_H$

Maximum efficiency between two temperatures.

Variables

Using the Heat Transport Charts

The total heat (sensible + latent) transported by an air stream in a heating or cooling process can be determined using wet bulb temperature charts. These charts account for both the temperature change and the moisture content of the air, providing a more accurate measure of energy transfer than dry bulb temperature alone.

To use the charts:

1. Identify the initial wet bulb temperature of the air stream on the vertical axis.
2. Trace horizontally to the line representing the initial condition.
3. Follow this line to the point corresponding to the final wet bulb temperature.
4. The heat transferred (removed or added) per unit mass or volume is read from the corresponding axis.

Available Charts and Units

The engineering data for heat transported by air is provided in several unit systems via downloadable PDF charts:

• Metric Units (Mass): Heat removed in kJ per kg of air.
• Metric Units (Volume): Heat removed in kJ per m³ of air.
• Imperial Units (Mass): Heat removed in Btu per lb of air.
• Imperial Units (Volume): Heat removed in Btu per cubic foot of air.

These charts allow engineers to quickly estimate thermal loads in HVAC, industrial drying, and air processing systems without performing complex psychrometric calculations for each scenario.

References

• Original Source