When we are calculating evaporative air conditioning in an industrial warehouse, we have the question of giving the solution with small equipment with an axial fan or larger format equipment with a centrifugal fan with higher static pressure.
According to our experience, the best option for the end user is to install larger equipment where significant economic savings will be obtained. Next, we are going to reason why we have reached this conclusion.
Required air flow
To calculate the necessary air flow in industrial buildings with a thermal load basically from the outside, that is, where there are no large sources of heat inside and based on the volumetric calculation method, a minimum of 20 air renewals per hour (calculated based on a height of 4m). For example; In a 750m2 warehouse and an average height of 10 meters, the required air flow is: 750m2 x 4m (*) x 20 renewals/hour = 60,000 m3/h (*) height where the air diffusion elements will be placed
Equipment selection
In the current market, there are a wide variety of mainly Asian models whose real air flow is around 10,000 m3/h with an available static pressure of 80 Pa. If we take the previous warehouse as an example, 60,000 m3/h of air will be required. fresh and filtered air, with which 6 units of 10,000 m3/h must be installed distributed on the surface of the roof or cover itself.
Problematic
These types of installations are becoming a problem in companies where the roofs are intended to install photovoltaic panels for the generation of renewable energy, but there are other problems to take into account such as:
- 6 openings must be made that weaken the main structure of the building
- Possible water leaks
- Drafts in winter, in the event that the equipment is not covered with covers
- In the installation process, each piece of equipment must be provided with an electrical connection socket, supply water and a drain, to evacuate the water in the automatic emptying cycles.
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Solution
At MET MANN, given the problem, we recommend the installation of equipment with a higher flow rate and available static pressure, with a minimum of 100 Pa, in addition to a G4 or M5 type air filter to ensure a correct quality of the air blown into the room to be heated. . In the previous example, with the installation of a unit of our model AD-70-V-100-185 we could guarantee the correct evaporative air conditioning and have up to +30% of free space to install solar energy panels.
- Advantages obtained
In summary, the main advantages of installing large-format equipment with a centrifugal fan are:
- Lower installation costs and future maintenance
- Preservation and increase of free surface on the roof of the building
- Quieter equipment compared to axial equipment with the same flow/pressure performance
- Possibility of applying air filters type G4 or M5
- Higher available static pressure allowing the application of different air diffusion systems: ducts, diffusers, nozzles, etc.
- Greater operating reliability by not using electronic boards. Very common operating errors are avoided in industrial environments where there are voltage variations, electromagnetic disturbances, harmonics, etc.
- Performance guarantee
Our evaporative air conditioners are tested by the LGAI Technological Center (Applus) and comply with the technical features indicated in our technical and commercial catalogues. Product range You can access our entire range of industrial evaporative air conditioners at this link: MET MANN EVAPORATIVE AIR CONDITIONERS