How Pre-Cooling Misting Systems Make Your Air Conditioners More Efficient

A condenser misting system installed in your air conditioner not only provides more efficient cooling and energy savings, but also reduces wear and tear on your equipment by reducing its workload.

Evaporative pre-cooling or adiabatic pre-cooling systems can be easily installed on new or existing air-cooled condensers. Custom fabricated and installed in front of the condenser coil faces, the misting system atomizes high pressure water into the incoming air stream. As the water is atomized between 5 and 10 microns, the fog flash evaporates, cooling the air entering the coil.

The most efficient way to operate pre-cooling systems is to evaporate water into the air in front of the coils, before it passes through the coil. This works more effectively than the method commonly used by building owners and air conditioning contractors, in which a struggling unit is sprayed with water from an irrigation system or garden hose. to cool the coils.

Using a condenser misting system to pre-cool the air before it enters the coils provides much more efficient cooling because the full airflow can still pass over the coil fins. Wetting the coil fins disrupts the airflow; with much larger water droplets needing to evaporate, this is much less efficient than evaporating the water in front of the coils with a condenser misting system.

Unlike most air conditioning systems, evaporative pre-cooling becomes more efficient as the ambient temperature rises; at higher temperatures, more fog can evaporate into the air, causing a greater difference between the ambient temperature and the temperature of the air entering the coils.

By reducing the workload on the air conditioning system via lower discharge pressures in the compressor system in the condenser, wear and tear on the entire system is significantly reduced. High head pressures in a system will reduce compressor life, while lowering head pressures through pre-cooling will extend condenser life.

Coil evaporative cooling has been shown in tests to reduce power consumption by more than 30% even at moderately warm temperatures of around 33°C. At higher temperatures, the energy savings will be even greater.

Karl M. Bailey