Measuring enthalpy to calculate efficiency


Courtesy of Power Knot LLC

This application note describes in detail how you can calculate the gain in efficiency of a direct exchange air conditioning system before and after treatment with the SRA. The physics underlying the method are explained.

Air comprises gasses and water moisture. The gasses are mostly nitrogen (78%) and oxygen (21%). The amount of water moisture in the air is expressed as a relative humidity with typical values of comfort for people between 20% and 65%.

When we heat or cool air, we are heating or cooling the gasses (which is called sensible heat) and we are heating or cooling the water vapor (which is called latent heat). The cooling process often removes water vapor from the air. This is commonly seen as water running from an air conditioning system.

A large amount of energy is required to heat or cool the water in the air. It is therefore important that we know both temperature and relative humidity to calculate how much heating or cooling is taking place. It is especially important if we want to show a change or improvement to a heating or cooling system.

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