In Humid Climates, Does Evaporative Cooling Work?

In humid climates, do evaporative coolers work in high humidity? Yes, in a nutshell, although it depends on the sort of evaporative system used.

Evaporative cooling is a physical process that relies on water evaporation, which means that the relative humidity influences the efficacy of the chosen system. The better the performance of an evaporative cooling system, the hotter and drier the environment. An indirect/direct evaporative system will outperform direct evaporative systems constantly. The harder it is for a direct evaporative cooling system to cool efficiently in a humid area. Having said that, indirect/direct evaporative cooling systems function significantly better during humid hours in more humid environments, such as coastal areas.

The main advantage of two-stage (indirect/direct) evaporative cooling over direct evaporative cooling is that it employs both the indirect and direct cooling processes. As a consequence, the cooler can chill up to 7°C deeper than competing evaporative cooling systems. Recent practice comes from indirect/direct cooling initiatives, where outside temperatures ranged from 48 to 52 °C and dry air resulted in entering temperatures of roughly 11 °C. The wet-bulb temperature was about 20 °C, resulting in a system wet-bulb efficiency of up to 135%. A direct evaporative cooler would have an efficiency of 85 percent, resulting in incoming air temperatures of roughly 22 degrees Celsius. In more humid areas, the benefit of indirect/direct cooling technologies will reach at least 114 percent wet-bulb efficiency, while direct evaporative systems would achieve about 85 percent.

Two-Stage Evaporative Cooling Semi-Hybrid Solution

However, evaporative cooling is still a physical process: at relative humidity levels of 80% or 90%, a two-stage evaporative system cannot cool as effectively as at lower humidity levels. Some desert/seaside climatic nations, such as Dubai, can have long periods of hot and humid weather. A semi-hybrid evaporative cooling system might give the best cooling option in this circumstance. This combines a two-stage evaporative cooling system with a standard, but compact, mechanical cooling system.

When the adiabatic system is unable to produce the requisite temperature during the more humid months of the year, the mechanical system kicks in. A factory hall or building may be suitably cooled all year with this semi-hybrid system while still reaping the considerable energy-saving benefits of evaporative cooling. In reality, the indirect/direct evaporative cooling system may function independently up to 90% of the time.

In Usage Is A Semi-Hybrid System

In light of worldwide efforts to cut CO2 emissions and the recent pandemic, energy conservation and access to fresh air are no longer a luxury but a need. As a result, a firm saw the need to replace its compressor-based packaged AC units in the Old Guesthouse, which serves as a client greeting hall. The compressors of these AC units utilized large amounts of energy to supply the required cooling capacity and fresh air under the severe circumstances of shifting environments. It sought out innovative cooling solutions to reduce energy usage and CO2 emissions while maintaining a comfortable atmosphere in the Old Guesthouse.