How to choose the size of the evaporative cooler for our industrial warehouse?

When calculating the evaporative cooling for an industrial warehouse, we face the dilemma of whether to use smaller units with axial fans or larger units with centrifugal fans and higher static pressure. According to MET MANN, the best option is to install larger units, which can lead to significant cost savings. Airflow RequiredTo calculate the required airflow in industrial warehouses with primarily external thermal loads (where there are no significant sources of heat inside), based on volumetric calculation, a minimum of 20 air changes per hour is needed (calculated at a height of 4 meters). For example, in a 750m2 warehouse with an average height of 10 meters, the required airflow is: 750m2 x 4m (*) x 20 air changes/hour = 60,000 m3/h (*) Height at which air diffusion elements will be installed Equipment SelectionCurrently, there is a wide variety of mainly Asian models in the market with real airflow around 10,000 m3/h and an available static pressure of 80 Pa. Taking the previous warehouse example, 60,000 m3/h of fresh and filtered air is needed, so 6 units of 10,000 m3/h should be installed, distributed across the ceiling or roof surface. IssuesThese types of installations can pose problems in companies where the roofs are designated for installing photovoltaic panels for renewable energy generation. Other issues to consider include: Weakening of the main building structure due to the need for 6 openings. Possible water leaks. Winter drafts if the units are not covered with protective covers. Each unit requires electrical connection, water supply, and drainage for automatic emptying cycles during installation. SolutionMET MANN recommends installing larger units with higher airflow and available static pressures of at least 100 Pa, along with G4 or M5 air filters to ensure proper air quality for the conditioned space. By using a model like AD-70-V-100-185 in the previous example, proper evaporative cooling can be ensured, and up to 30% more space may be available to install solar panels. BenefitsIn summary, the main advantages of installing larger units with centrifugal fans are: Lower installation and future maintenance costs. Preserving and increasing free space on the roof. Quieter operation compared to axial units with the same airflow/pressure performance. Option to use G4 or M5 air filters. Higher available static pressure, allowing for various air distribution systems like ducts, diffusers, nozzles, etc. Increased reliability by avoiding the use of electronic boards, reducing common malfunctions in industrial environments with voltage variations, electromagnetic disturbances, harmonics, etc. Performance GuaranteeMET MANN's evaporative coolers are tested by LGAI Technological Center (Applus) and meet the technical specifications indicated in their technical and commercial catalogs. Product RangeYou can access their full range of industrial evaporative coolers at this link: MET MANN EVAPORATIVE COOLERS.