What is indirect direct evaporative cooling?
In Indirect Evaporative cooling, the primary air is cooled without coming in contact with water. Hence in first stage air is cooled without adding any moisture to it and then cooled further in the second stage with the direct evaporative cooling process with extra reduction of 5 Degree c.
Is direct or indirect cooling better?
Most engineers would agree that direct cooling appears to be more efficient than indirect cooling, and from a purely technical standpoint, it is. Cooling a bulk solid by passing cool air through it brings the cooling medium and the product into direct contact.
How does an indirect evaporative cooler work?
With an Indirect Evaporative Cooling system the supply air is passively cooled before it enters the space by passing over a medium that has been directly evaporatively cooled on an adjacent but isolated side. Thus no moisture is added to the supply air stream.
How does a 2 stage evaporative cooler work?
Indirect/direct cooling, also known as two-stage evaporative cooling, uses both indirect and direct cooling techniques to cool the air. The first indirect “cooling step” uses cold recirculation water to pre-cool the ambient air in a heat exchanger.
How does direct evaporative cooling work?
Direct evaporative cooling (open circuit) is used to lower the temperature and increase the humidity of air by using latent heat of evaporation, changing liquid water to water vapor. In this process, the energy in the air does not change. Warm dry air is changed to cool moist air.
What is the difference between direct evaporative air cooling and indirect evaporative air cooling?
Munters evaporative cooling solutions include direct evaporative coolers, where water is evaporated into the air stream via an engineered pad to provide adiabatic cooling, and indirect evaporative coolers, where evaporating water is used to cool the scavenger airstream passing through a heat exchanger, thus maintaining …
What is a two stage evaporative cooler?
At what humidity do evaporative coolers become ineffective?
Yet, evaporative cooling remains a physical process: with a relative humidity of 80% or 90%, a two-stage evaporative system cannot cool as effectively as at lower humidity levels.
Do evaporative coolers work in high humidity?
Evaporative cooling works well in hot and dry climates where humidity is typically below 25% on hot summer days. Evaporative coolers will operate under higher humidity conditions, particularly when the ambient temperature is cooler, however increased airflow is often required to achieve satisfactory cooling.
How does indirect cooling work?
Indirect evaporative cooling (IEC) combines the benefits of the evaporative cooling effect for sensible cooling without the addition of moisture into the primary air stream. During this process a secondary air source is used to remove heat from the primary air through the use of a heat exchanger.
What stage of cooling is the evaporative cooling mode?
Evaporative cooling—when drying a solid with free or bound moisture, the effect of a phase change from the liquid state to the vapor state removes energy from the liquid-solid mass.
What is two-stage air washer?
Air washer machine is utilizing the natural process of water evaporation along with an air moving system to create effective cooling. The ambient air is pulled through filters and it passes through the cooling pad then it cools the air through water evaporation.