Frequently Asked Questions

Frequently Asked Questions

To heat a building less than 5 meters high, the most effective heating system is represented by ceiling radiant panels, which allow to heat the room uniformly, without creating stratification phenomena.

EUTERM ceiling radiant panels are also the ideal solution for rooms where working processes and quantity of stored materials lead to the formation of gases, vapours and/or dust, which can cause fires and/or explosions.

To cool the entire warehouse, the optimal solution is the use of an evaporative cooling system, which allows you to cool the air inside the shed in a natural way and with an important energy saving. The air diffusion can be done with 4 and 6 way diffusers or through microperforated piping, in order to make the comfort in the environment as uniform as possible.

If you have a warehouse less than 10 meters high (but more than 5 meters) there are several effective heating solutions: first of all is certainly the EUCERK radiant strip heating system, ideal for heating large areas and ensuring the right comfort.
Next we find the EUTERM ceiling radiant panels, the EURAD radiant tube heaters and finally the EUCERAMIC radiant diffusers, with which zone heating is more easily achievable.

For the summer cooling of the warehouse the most effective, sustainable and economical solution is undoubtedly the adiabatic cooling system EUCOLD.

For a warehouse with a height of more than 10 meters, the most effective heating solution is a EUCERK radiant strip system, which guarantees a homogeneous heat distribution.
If you want to quickly reach the optimal conditions of comfort or you want a zone heating, the most effective solution is represented by EUCERAMIC radiant diffusers.
Other effective solutions for heating areas where the installation height of the plant is more than 10 meters are the EURAD gas-fired radiant tube heaters, which are also suitable for zone heating.

To effectively and sustainably cool the different working areas, the optimal solution is the EUCOLD adiabatic cooling system, available in different models that, thanks to their versatility, allow a roof, wall and basement installation with the connection of the air duct respectively downward, lateral, and upward.

The main elements that we take into account to offer you the most effective solution to your needs are:

• The type of fuel or energy source you have available for the plant
• The total area to heat (or cool)
• If zone heating or uniform heating across the entire area is required
• The optimal height at which the system can be installed
• The amount of air changes in the environment to be heated or cooled
• The degree of insulation of the building
• The internal temperature of comfort required
• Any internal thermal loads (e.g. high concentration of CNC machines)

To start-up a Carlieuklima heating system, please contact us by email; our operators will give you all the necessary information, connecting you with our service authorized centers.

Maintenance depends on the type of system and the type of use. For more information send an email to

Depending on the type of system installed, maintenance, can be performed by your maintenance engineer or by our service center, that will personally come to examine the system and perform the maintenance necessary to ensure proper operation of the system over time.

Spare parts for Carlieuklima products are available at our Authorized Service Centers or directly at us; for information you can write to us at

Questions on radiant heating

Radiant heating is a natural phenomenon of energy transmission from a higher temperature body to a lower temperature body. In detail, energy is emitted in the form of electromagnetic waves, the intensity of which depends on the temperature of the emitting body. It is absorbed by the receiving bodies (people, machineries, floor, walls, shelves, etc…), which are then heated.

The systems are hung from the ceiling and/or walls of the room to be heated, to hit directly and without dispersions, the floor, the machineries and people to heat. Appropriate calculations are made in order to concentrate the flow only where it is needed, so as to make the plant as effective and efficient as possible while reducing the electrical and fuel consumption.

The advantages are many: more comfort in the workplace, less heat loss in the environment (warm air goes upwards while radiation is concentrated in the desired area), healthier places (no draughts and dust lifting) and greater sustainability than a convection system.

If there are few air changes within the working environment, the most effective solution for heating buildings less than 10 meters high is represented by EUTERM ceiling radiant panels and EUCERK radiant strip heaters.
Another optimal solution, in this case, is represented by EURAD radiant tube heaters.

On the other hand, if your building is more than 10 meters high and with few air changes, the solutions can be: EUCERAMIC radiant diffusers, EUCERK gas-fired radiant strip heaters, EUTERM ceiling radiant panels, EURAD radiant tube heaters.

Each project is specifically studied. For more detailed information and that meet your needs we recommend you contact us. Our technicians are at your disposal to give you all the specifications you need.

Questions on evaporative cooling

It is a heat exchange between air and water that causes a partial evaporation of the water and a consequent cooling of the air. Since the phenomenon occurs on the contact surface between these two elements, the efficiency of the heat exchange is greater the larger the contact surface between them. A tangible example of the effects of this phenomenon is the cool breeze that we can perceive on the lakeside, where there is a continuous heat exchange that lowers the air temperature.

Find out more in our blog article: What is evaporative cooling, how does it work, and why choose it.

Because it is possible to have an excellent relationship between benefits and costs, both of the plant and of operation and maintenance.

With an evaporative cooling system it is possible to recreate the conditions to maximize the natural heat exchange air-water and produce a significant flow of fresh air to be fed into the rooms to be air conditioned. Through a channeling system studied “ad hoc” it is therefore possible to ensure the conditions of maximum mixing of fluids and a targeted distribution of air in hot environments.

The two systems are not comparable in terms of performance.
A chiller makes available thermal energy in the form of water or cooling fluid at low temperature and the conditions of the external environment only partially affect the “amount of cold produced”.

The performance of an evaporative cooling system, however, is directly related to the thermo-hygrometric conditions of the external air.
In this case, the energy consumption used remains constant and extremely low throughout the working range, while the “amount of cold produced” can vary depending on the climatic conditions.

Discover the differences in more detail by clicking here.

An adiabatic cooling system is ideal for reducing the sensitive thermal load of medium to large rooms. Although in certain situations it is not possible to achieve performance comparable to that of a chiller air conditioning system, the benefit in terms of comfort is important and the energy costs are much lower.

Thanks to the very low energy requirement, this system is the ideal compromise to maintain conditions of thermo-hygrometric comfort in line with the needs of a productive environment throughout the summer season.

As already seen, the system operates thanks to the thermal exchange that takes place between air and water.
The movement of the air takes place through the use of one or more fans that suck the outside air, allow it to pass through the evaporative panels loaded with water and convey it to a channeled distribution system. The electrical demand of the fans is therefore the prevailing consumption of the system.
For this reason, fans with specific fluid dynamic characteristics and a multi-speed regulation system were used to further limit absorption. Other elements such as the pump, valves and the ozone generator result in practically negligible consumption, which can be extremely reduced in the “free-cooling” mode of operation (inactive water pump).

The system involves the installation of one or more cooling units outside the buildings, placed on the roof, on the wall or at ground level and a special air distribution system.

The system is completed by any extractors, gravity dampers or controlled opening windows useful to facilitate the expulsion of hot air.

For greater efficiency of adjacent cooling systems, it is necessary to create the conditions to facilitate the entry of fresh air and the simultaneous expulsion of hot air. In this regard, it is possible to take advantage of openings such as windows, doors and gates to improve the overall performance and also favor the cooling of the roof with consequent reduction of the radiant component.

Sometimes it is necessary to use the system even during the night, during which it is difficult or impossible to keep the premises open. In these cases it is advisable to install passive overpressure systems or special devices for forced extraction of air.

The EUCOLD coolers are designed to work very simply. Starting from a basic system that provides only the switching on and off of each individual cooler through switches of the type ON/ OFF, you can get to the remote management of the entire system through a centralized interface and its wired network.

When the plant is equipped with a centralized control system, the customer has the only task of configuring the user interface with which he can set parameters such as set-points and time slots of the weekly programming. However, through its network of Technical Assistance Centers, Carlieuklima is able to offer additional customization for the management of evaporative panel cleaning cycles, the timing of the tank water replacement and other parameters to maximize efficiency and reduce consumption.

Yes! During the definition of the plant solution that best suits the needs of the client, aspects related to the centralized management of the plant are also taken into account. In cases where it is necessary to interface with a general management system and/ or higher order, it is certainly possible to integrate the management of EUCOLD adiabatic coolers.

Absolutely yes. The performance of adjacent refrigeration systems depends largely on the thermo-hygrometric conditions of the external air and in particular on the relative humidity rate of the air.
A high humidity rate, in fact, limits the “amount of heat” that can be removed through the air-water exchange.
However, although it may be thought that the relative humidity values of the air during the daytime hours of summer days are high, this is not always true, on the contrary: an increase in air temperature always corresponds to a decrease in the relative humidity rate.

We can have a test by observing the data provided by the CTI (Italian Thermotechnical Committee) relating to the hourly weather conditions of our cities, from which it is clear that on hot summer days the relative humidity values are more than acceptable. The system is therefore working under favourable conditions.

In the rare days when the external humidity values remain high even during the day, it is plausible that the performance of the system is limited and that the temperature jump to which the “treated” air is subject is a few degrees. However, the contribution of the plant in terms of perceived heat remains significant. In such extreme conditions, in fact, the lowering of the ambient temperature of some degree still brings obvious benefits in terms of comfort.

Different is the speech for the evening and night hours, in which the humidity tends to grow. In such conditions, the system directly exploits the mild temperatures of the outside air, entering it into the environment without the need to cool it and therefore without the use of water (free-cooling mode).

In typical conditions of use for a building for industrial use, the adjacent cooling system provides for the introduction into the environment of large volumes of cooling air (10 15 parts/ hour). Taking into account the tolerances related to the diffusion of air in the environment, it is plausible to expect temperatures very close to the input temperatures (see the EUCOLD 530 performance overview) in areas where there is a direct flow of treated air and a slightly higher temperature with lower relative humidity in the surrounding areas (also due to the thermal load due to machinery, lighting, etc.).

To determine the correct temperature reduction, it’s important to consider that it is influenced by the humidity percentage in the incoming air. The hotter and drier the day (thus, with a lower humidity percentage), the higher the performance of the cooling system will be. Conversely, as humidity levels increase, efficiency will decrease.
Let’s take a practical example: external air at 32°C with a humidity level of 45% can cool down by as much as 8-10°C, entering the working environment at a temperature of approximately 24°C.

Learn more here: How much does an evaporative cooler lower the temperature?

During the system dimensioning phase, the hourly climate data of the location where the plant is to be installed are taken into account, identifying plausible average working conditions and the consequent expected performance for the cooling units.

At the same time it is necessary to identify the thermal load that characterizes the rooms to be cooled, to the determination of which mainly contribute solar radiation (through cover, walls and transparent elements) and the endogenous component linked to the electrical power dissipated by the operating machines.

At this point it is possible to evaluate the number of cooling units to be installed and the sizing of the air distribution system also based on considerations related to specific micro-localized conditions with the relative tolerances.

In the winter season when the internal temperature is higher than the external one, the distribution channels could convey the ambient air to the cooled units, causing a dispersion of heat. To prevent such a flow, it is possible to use a special cover that, in addition to preventing the passage of air (effectively sealing the passage) helps to protect the unit from atmospheric agents.

If it is necessary to use the system also in winter to ensure the minimum air flow renewal (pursuant to dlgs 81/08)it will continue to operate in ventilation mode only and the water circuit will be emptied to prevent freezing of the water contained in it.

For proper and complete maintenance, the cooling units must be cleaned at least annually. In conditions where the hardness of the feed water was particularly high, it is advisable to more often check the state of the evaporative panels to prevent the formation of limestone and thus maintain the effectiveness of air-water exchange.

In general, it is a good idea to reach the units at least twice a year, at the first start of the season to remove the protective sheet and to put out of service in winter to reposition.

The system does not require the use of refrigerating fluid and therefore no F-Gas certification is required by the maintainer.

The water tank automatically empties every 4 hours with a self-cleaning cycle to ensure the cleanliness of the evaporative panels and the cooling circuit. Additionally, when the cooler is turned off, another cleaning cycle is performed to prevent water stagnation. This repetitive process prevents mineral crystallization and ensures long-lasting and highly efficient cooling.

To ensure the best performance of air coolers, it is advisable to use potable water with a low mineral content to reduce limescale buildup. Avoid using salty or chemically treated water, as it can damage the internal components of the cooler. In cases of high water hardness, it is recommended to install a water softener at the water inlet.

The dust filters of the cooler can be cleaned with a rubber water hose, without detergents. This procedure is recommended before and after the summer season. During summer, more frequent cleaning can be done with an air compressor.

Evaporative coolers operate on the natural principle of water evaporation. Water acts as a natural refrigerant.

The units draw in warm outside air, which is filtered and passes through water-soaked honeycomb panels. The air, pushed by the fan, transfers some of its heat to the water in the evaporative pads, thus lowering its temperature.

The cooled air is then introduced into the work environment at more comfortable temperatures.

The evaporative cooler can be installed on the roof or wall. Roof-mounted coolers are installed on the building’s roof. They are ideal for industrial, commercial, sports, railway environments, and livestock facilities up to 6 meters in height, providing uniform and efficient cooling without dispersions. Wall-mounted coolers are perfect for industrial and commercial spaces with heights above 6-8 meters. They allow for installation with optimal air distribution height without creating internal thermal discomfort, are versatile, and only require a window for exhaust air.

For a large building with frequently opened doors, the cooler uses only 4.85 kW of electrical energy. The water required for its operation is not wasted, as it evaporates during the cooling process and naturally returns to the environment through the hydrological cycle.

The replacement frequency of evaporative pads depends on several factors: the hardness of the water used for the evaporative process, the presence of external elements in the air that could deposit inside the panels, the hours of use of the system, and the maintenance performed. Generally, evaporative pads last from two to four years; if some time has passed, it is advisable to replace them even if there are no visible signs of dirt.

Evaporative cooling significantly improves air quality in work environments thanks to the continuous introduction of fresh air. Unlike traditional systems, industrial coolers work best with open doors and windows, facilitating the expulsion of stale air and ensuring a fresh and clean environment throughout the day.

Questions about the air barriers

Air barriers, or air curtains, are devices installed near doors and gates to separate the internal climate from the external one. They are mainly used in industrial environments such as factories, warehouses, railway workshops, stores, and public buildings. Since doors often remain open for the transit of people and work vehicles, air barriers help to prevent temperature fluctuations and reduce the energy consumption of air conditioning systems.

Air curtains effectively support air conditioning systems by creating a barrier against the external environment. Positioned near gates, they prevent the entry of air and dirt into the work environment. Depending on the model, the airflow can come from the top or the bottom of the opening. This barrier significantly reduces thermal losses and allows personnel working near the gates to work without experiencing the negative effects of temperature fluctuations or drafts.

Questions about the Lido outdoor heater

The Lido outdoor heater heats an outdoor space of 20 to 25 m2 maximum. It has a minimum power of 6.5 kW and a maximum power of 13 kW.

If set at maximum power, a 15 kg gas cylinder has a maximum duration of 20 hours.

Several factors need to be considered to choose the heater that best suits your needs. First of all, it is necessary to understand how many square meters we need to heat and which power source we intend to use. Once these two fundamental aspects are clarified, we need to focus on the aesthetic aspect of the product, its quality, and the price. It is essential to choose an outdoor heater that integrates with the style of our outdoor space to create a suggestive atmosphere that attracts customers.

With a minimum power of 6.5 kW, a gas-powered outdoor heater running on LPG consumes an average of 0.38 kg/h. While with a maximum power of 13 kW, it consumes a maximum of 0.77 kg/h.