{"id":1610,"date":"2026-08-20T10:00:00","date_gmt":"2026-08-20T10:00:00","guid":{"rendered":"https:\/\/climntech.com\/?p=1610"},"modified":"2026-08-10T06:03:01","modified_gmt":"2026-08-10T06:03:01","slug":"industrial-evaporative-cooler","status":"publish","type":"post","link":"https:\/\/climntech.com\/en\/ventilateur-adiabatique-industriel\/","title":{"rendered":"Industrial adiabatic fan: operation, performance, and real-world limits"},"content":{"rendered":"

A workshop at 36\u00b0C under a roof in the middle of summer? A production line that cannot be stopped? A traditional air conditioning bill that would make any technical director wince? These are all contexts in which the evaporative cooler has carved out a place for itself in the industrial sector. The principle appeals for its simplicity (water, air, no refrigerant gas), but its efficiency depends on specific conditions that many product spec sheets gloss over. This is also the case for certain constraints that complicate its installation in the most sensitive environments. ClimnTech<\/a> shed light on the subject.<\/p>\n\n\n\n

The physical principle, without shortcut<\/h2>\n\n\n\n

An evaporative cooler<\/a> draws in ambient air and passes it through an evaporative media (a honeycomb panel or porous pad) kept constantly moist by a closed-circuit pump. As the water evaporates upon contact with the warm air, it absorbs part of its sensible heat in the form of latent heat of vaporization. The air thus emerges cooler, but also slightly more humid, before being propelled into the space to be treated by a centrifugal or axial fan, depending on the desired capacity.<\/p>\n\n\n\n

The temperature drop achieved is generally between 5 and 12\u00b0C. This difference depends directly on the temperature and humidity of the incoming air. At a site where outdoor air reaches 35\u00b0C with moderate humidity, supply air at 22-24\u00b0C remains entirely achievable. This variability, inherent to the process, deserves to be explained before purchase rather than discovered after installation.<\/p>\n\n\n\n

What the process really saves<\/h2>\n\n\n\n

The energy argument remains the strongest. Without a compressor or refrigerant, an evaporative cooler consumes between 5 and 10 times less electricity than a direct expansion air conditioner of equivalent capacity. For an industrial hall operating for several months a year during hot periods, this difference translates into thousands of euros saved on the energy bill, not to mention the absence of refrigerants to monitor or F-Gas regulations to comply with.<\/p>\n\n\n\n

The other advantage, which is less emphasized, relates to the air renewal required by the system's operation. Unlike a closed-loop air conditioning<\/a>, an adiabatic cooler operates with openings (doors, loading docks, roof vents) which mechanically improves indoor air quality. All while continuously evacuating dust, vapors, and process odors.<\/p>\n\n\n\n

The limits that are never detailed enough<\/h2>\n\n\n\n

The system becomes significantly less effective when the ambient humidity exceeds 60\u201365 %. This is because the air is already close to its saturation point, evaporation slows down, and the cooling effect becomes negligible. A site located by the sea, or an operation that generates humidity itself\u2014such as certain food processing industries\u2014must therefore take this factor into account before choosing this method over conventional air conditioning.<\/p>\n\n\n\n

The second point, often minimized, concerns the air renewal necessary for the proper functioning of the system, on the order of fifteen to twenty volume changes per hour according to specialized installers. A totally closed building, without the possibility of evacuating the blown-in humid air, will never allow the performance advertised on the technical datasheet to be achieved. Here, humidity stagnates, and comfort degrades instead of improving.<\/p>\n\n\n\n

The evaporative cooler is therefore not a universal solution, but a very effective tool in its field of application: large semi-open volumes, workshops with outside access, or even stable and breeding area<\/a>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The special case of the ATEX zone<\/h2>\n\n\n\n

On a ATEX-classified site<\/a>, the question does not stop at the choice between adiabatic and conventional air conditioning. A standard cooler includes an electric pump, a motor, and often a control board. These are all components capable of generating a hot spot or a spark, which are incompatible with an atmosphere where combustible gases, vapors, or dust can mix with the air.<\/p>\n\n\n\n

The installation of such a device in Zone 1, 2, 21 or 22<\/a> therefore requires a specifically ATEX-certified model, in which every electrical component meets a type of protection adapted to the site's risk category. This is a point that most generalist manufacturers of evaporative coolers do not address, simply because their standard range is not designed for these environments.<\/p>\n\n\n\n

\n

This is precisely the field in which ClimnTech has specialized: mobile evaporative cooling solutions, certified for explosion-risk zones, designed for industrial workstations rather than commercial use.
If your workshop is ATEX-classified and heat becomes a recurring problem during the hot season, a quick site assessment can determine in just a few days which configuration is truly suitable. Call us<\/a>.<\/strong><\/p>\n<\/blockquote>\n\n\n\n

Apart from the ignition risk, the antistatic benefit of mild air humidification makes the adiabatic principle a relevant option in an ATEX zone. Provided that the device itself is certified to be used there, of course.<\/p>\n\n\n\n

How to choose without making a mistake on the sizing<\/h2>\n\n\n\n

The volume to be treated remains the primary criterion, but rarely the sole determinant. The average humidity of the site directly conditions the expected efficiency, as does the actual feasibility of ensuring the air renewal necessary for the system to operate. The need for mobility also comes into play at sites where high-heat workstations shift according to production. Likewise, the potential ATEX classification of the site immediately restricts the choice to certified devices.<\/p>\n\n\n\n

\n

Poorly assessed sizing remains the primary cause of dissatisfaction with this type of equipment. Our teams conduct an on-site thermal audit before making any recommendation, precisely to avoid this pitfall. Please feel free to Contact us<\/a> to evaluate the configuration suited for your workshop.<\/strong><\/p>\n<\/blockquote>\n\n\n\n

Within its field of application, the evaporative cooler remains one of the most cost-effective solutions on the market for treating large industrial volumes. Understanding its limitations as much as its advantages avoids disappointments. Moreover, this makes it possible, where appropriate, to point toward a complementary or certified solution rather than a device unsuited to the actual use of the site.<\/p>\n\n\n\n

Frequently Asked Questions<\/h2>\n\n\n\n

Does an adiabatic fan work in a closed indoor space?<\/strong><\/h3>\n\n\n\n

Its effectiveness depends on sufficient air renewal. In a completely enclosed building, without the evacuation of the supplied humid air, performance drops significantly compared to the conditions of a semi-open space.<\/p>\n\n\n\n

What is the difference between a fan and a traditional air conditioner?<\/strong><\/h3>\n\n\n\n

The conventional air conditioner cools via a closed-circuit refrigeration cycle and precisely regulates the temperature. The evaporative cooler cools by water evaporation, consumes much less energy, but requires constant air renewal and remains less effective in very humid environments.<\/p>\n\n\n\n

Can an evaporative cooler be installed in an ATEX zone?<\/strong><\/h3>\n\n\n\n

Yes, provided you use a model specifically certified ATEX. A standard device contains electrical components that are not suitable for an explosive atmosphere and represents an ignition risk.<\/p>\n\n\n\n

What energy savings can be expected compared to traditional air conditioning?<\/strong><\/h3>\n\n\n\n

Generally between 5 and 10 times less electricity consumption, with the exact difference depending on the installed capacity and the site's annual operating time.<\/p>\n\n\n\n

At what humidity level does the system lose efficiency?<\/strong><\/h3>\n\n\n\n

Above 60 to 65 % of ambient humidity, the cooling effect becomes significantly more limited, as the air is already close to its saturation point.<\/p>","protected":false},"excerpt":{"rendered":"

A workshop at 36\u00b0C under a roof in the middle of summer? A production line that can\u2019t be shut down? A conventional air-conditioning bill that would make any technical director cringe? These are just some of the situations in which the adiabatic fan has established itself in industrial settings. The principle is appealing for its simplicity (water, air\u2014no refrigerant), but its effectiveness depends on specific conditions that many product spec sheets fail to mention. This is also true for certain constraints that complicate its installation in the most sensitive environments. ClimnTech sheds light on the subject. The physical principle, without oversimplification An adiabatic cooler draws in ambient air and passes it through an evaporative medium (a honeycomb panel or a porous pad) that is kept constantly moist by a closed-loop pump. As the water evaporates upon contact with the hot air, it absorbs part of the air\u2019s sensible heat in the form of latent heat of vaporization. The air therefore emerges cooler, but also slightly more humid, before being blown into the space to be cooled by a centrifugal or axial fan, depending on the desired capacity. The resulting temperature drop is generally between 5 and 12\u00b0C. This range depends directly on the temperature and relative humidity of the incoming air. At a site where the outdoor air reaches 35\u00b0C with moderate humidity, a supply air temperature of 22\u201324\u00b0C is entirely achievable. This variability, which is inherent to the process, should be explained before purchase rather than discovered after installation. The Real Benefits of the Process The energy efficiency argument remains the strongest. With no compressor or refrigerant, an adiabatic cooler consumes between 5 and 10 times less electricity than a direct expansion air conditioner of equivalent capacity. In an industrial facility operating for several months a year during hot weather, this difference translates to thousands of euros in savings on the energy bill\u2014not to mention the absence of refrigerant to monitor or F-Gas regulations to comply with. Another advantage, one that is less often highlighted, stems from the air renewal required by the system\u2019s operation. Unlike a closed-loop air conditioning system, an adiabatic fan operates using openings (doors, loading docks, vents), which mechanically improves indoor air quality. All this while continuously removing dust, vapors, and process odors. The limitations that can\u2019t be emphasized enough The process loses significant efficiency when ambient humidity exceeds 60\u201365 %. In fact, the air is already close to its saturation point, evaporation slows down, and the cooling effect becomes negligible. A site located by the sea, or an operation that generates moisture itself\u2014such as certain food processing industries\u2014must therefore take this factor into account before choosing this system over conventional air conditioning. The second point, which is often downplayed, concerns the air exchange rate necessary for the system to function properly\u2014typically between fifteen and twenty air changes per hour, according to specialized installers. A completely enclosed building, with no way to exhaust the humid air that has been introduced, will never achieve the performance levels listed on the technical specifications. In such a situation, humidity builds up, and comfort deteriorates rather than improves. The adiabatic fan is therefore not a universal solution, but a highly effective tool within its specific application areas: large, semi-open spaces; workshops with outdoor access; or stables and livestock facilities. The Special Case of ATEX Zones In an ATEX-classified area, the issue goes beyond simply choosing between an adiabatic cooler and conventional air conditioning. A standard cooler contains an electric pump, a motor, and often a control board. All of these components have the potential to generate a hot spot or a spark, which is incompatible with an atmosphere where flammable gases, vapors, or dust can mix with the air. Installing such a unit in Zones 1, 2, 21, or 22 therefore requires a model specifically ATEX-certified, in which every electrical component meets a protection method appropriate for the site\u2019s risk category. This is an issue that most general-purpose manufacturers of adiabatic fans do not address, simply because their standard product lines are not designed for these environments. This is precisely the area in which ClimnTech specializes: mobile adiabatic cooling solutions, certified for explosion-hazard zones, designed for industrial workplaces rather than commercial use.If your workshop is ATEX-certified and heat becomes a recurring problem during the hot season, a quick assessment of your site will determine within a few days which configuration is truly suitable. Give us a call. Aside from the risk of ignition, the antistatic benefit of lightly humidifying the air makes the adiabatic principle a relevant option in ATEX zones. Provided, of course, that the unit itself is certified for use in such environments. How to Choose the Right Size Without Making a Mistake The volume to be treated remains the primary criterion, but it is rarely the only determining factor. The site\u2019s average humidity directly affects the expected efficiency, as does the actual ability to ensure the air exchange necessary for the system to function. The need for mobility is also a factor at sites where high-heat workstations are moved around depending on production. The same applies to any ATEX classification of the site, which immediately limits the choice to certified units. Incorrect sizing remains the leading cause of dissatisfaction with this type of equipment. Our teams conduct an on-site thermal audit before making any recommendations, precisely to avoid this pitfall. Please feel free to contact us to evaluate the configuration best suited to your workshop. Within its field of application, the adiabatic fan remains one of the most cost-effective solutions on the market for handling large industrial volumes. Understanding both its limitations and its strengths helps avoid disappointments. Furthermore, this allows us, if necessary, to recommend a complementary or certified solution rather than a unit unsuited to the site\u2019s actual use. FAQ Does an adiabatic fan work in a closed indoor space? Its effectiveness depends on sufficient air exchange. In a completely enclosed building, without a way for the humid air that is blown in to escape, performance drops significantly compared to conditions in a semi-open space. What is the difference between a fan and a conventional air conditioner? The<\/p>","protected":false},"author":1,"featured_media":1612,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1610","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nVentilateur adiabatique : fonctionnement et limites<\/title>\n<meta name=\"description\" content=\"Ventilateur adiabatique : principe, \u00e9conomies d'\u00e9nergie r\u00e9elles, limites en milieu humide et cas particulier de la zone ATEX.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/climntech.com\/en\/industrial-evaporative-cooler\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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