There are several factors that influence the effectiveness or efficiency of two-stage evaporative cooling. These are:
The psychrometric diagram depicts all parameters which are involved in an evaporative process.
As evaporative cooling is a physical process based on the evaporation of water, different climates affect the effectiveness of evaporative cooling differently. The hotter and dryer a climate is, the higher the performance of an evaporative cooling system. A desert climate is, therefore, the most optimal climate for evaporative cooling. High temperatures and low humidity, provide a lot of cooling power. Cooling from 45 °C to 15 °C is no exception. In coastal areas where temperatures are still high but the humidity is often higher, the delivered temperature will end up a few degrees higher. In most continental and maritime climates, dry and more humid periods alternate, here only two-stage evaporative cooling can work effectively through the year. Humid days, in continental and maritime climates, occur mostly during spring and autumn when temperatures are still relatively low, and the humidity is only high for a couple of hours during the day. Due to the two-stage technology cooling of the IntrCooll, the cooling performance is retained. For the rest of the year, two-stage evaporative cooling functions as an effective and sustainable indoor climate solution. For countries in a tropical climate evaporative cooling may not be the most effective cooling solution though a hybrid version allows still for substantial energy savings.
The graphs show the effectiveness of evaporative cooling in continental&maritime, tropical, and desert climates.
Some desert climate countries, such as Dubai, can experience longer humid periods. In this case, a hybrid evaporative cooling system can provide an optimal cooling solution. The hybrid system combines evaporative cooling with a mechanical cooling system. The mechanical system can be switched on only during the more humid days, whereas the evaporative system cools the rest of the year. With this hybrid system, a production hall or building can be cooled adequately throughout the whole year without losing the extensive benefits of evaporative cooling.
The more humid a climate is, the harder it is for a direct evaporative cooling system to cool effectively. This being said, indirect/direct evaporative cooling systems hold their performance far better in more humid regions, such as coastal areas, during the humid hours. How this works, you can read in this blog.
At the words ‘climate control’, most of us will instantaneously think of mechanical AC. There are, however, other methods to control the indoor climate. In this blog, we discuss two-stage evaporative cooling.
Workers in production halls with little or no climate control suffer from extreme indoor temperatures when outside temperatures are high. Fortunately, this problem can be solved with a simple and sustainable solution. Read more about it in this blog.