ThermoKey's experience in the choice of custom-made solutions

During our 30-year experience we have tested different material combinations to meet the needs of our customers linked to specific contexts in which our units are installed.

Following you will find some examples of contexts and working processes that may be corrosive for the plants and their components, which therefore require a combination of specific materials.

The right choice for sustainable and durable solutions

Finding the right solution for the environment in which the units are installed allows you to identify technologies and materials that have a positive impact on their durability. A useful longer life of the products also affects costs in the long run.

The correct solution to the specific needs linked to the environment and the area of use also reduces the consumption of materials, refrigerants and energy sources. A more sustainable plant is a value, both for the customer who can reduce costs and for the environment.

Manufacturing processes

Contesti specifici richiedono soluzioni specifiche


Carbon dioxide, ammonia, nitric oxide, hydrocarbons, compounds of sulphur, fluorides, chlorine, carbon monoxide and their reaction products are among the most corrosive substances for metal.


Some of the working process and of food products can be corrosive for the air cooled units. Among these there are the smoking and the fermentation processes.


Some preservation processes of food products can be corrosive for the air cooled units. Among these there are the preservation in salt e under vinegar.


Some factories emit fluorides, among them: power plants, aluminium / iron and steel manufacturers, bricks and ceramic factories.


Some management processes of chemicals (e.g. pharmaceutical productions etc.) can be corrosive for the air cooled units.


The Heat exchangers used in waste disposal plants and water purification plants are subject to a greater corrosion.

Environmental conditions

The air cooled units used in the market of Air Conditioning, Refrigeration and Industrial Applications are typically installed outside in a remote location, (for example roofs, yards, etc.) and therefore are subjected to all environmental characterizations.

There are several regulations that define a classification of external environments. The main categories are:

  • rural area;
  • urban area;
  • coastal area;
  • industrial area;
  • coastal-industrial area.

These areas, in turn, can be further divided, as they can create specific micro-environments, which are the sum of one or more of the above mentioned.

In addition to these classifications, there are also further burdensome situations due to the significant presence of pollutants such as e.g. SOxes typical of climatic zones with intense presence of acid rain (eg northern Europe) or areas near volcanoes etc.

All these pollutants can significantly change the pH of the environment, making the deposits on the units extremely corrosive.

Another factor to take into consideration is the TOW (time of wetness), that is the amount of time when there is a constant presence of humidity above 80% with a temperature above 0 ° C.

These are only some examples of environmental situations that require an in-depth analysis of the installation before making a technical choice.

Moreover also the instructions on the methods of maintenance and cleaning must be taken into consideration in the following cases:

  • after shipment of the units by sea
  • during operation of the unit in particularly dirty places

The correct definition of the corrosive environment directly impacts on the choice of the materials of the exchanger, of the structure and of the fans to be used.

Contesti specifici richiedono soluzioni specifiche


The high concentration of chloride in coastal areas can be corrosive for metals.


Sand found in desert environments can cause abrasion and packing.


High humidity can damage the installations in the long term.


The protracted exposure to high temperatures can be harmful to the installations.

Choosing the right material

All above mentioned factors highlight the importance of the initial technical choice of the unit materials.

It is essential to keep in mind the corrosive aspects linked to the installation site and the use and application method.

ThermoKey offers a wide range of technical solutions able to respond to different application needs.

For example it is possible to manufacture both standard copper-aluminium units with several protective treatments (cataphoresis, blygold, heresite…) and entirely stainless steel units. The choice between these different technical solutions impact both thermodynamic aspects and costs.

Contesti specifici richiedono soluzioni specifiche

Contact our technicians for a specific consultation on your needs

Our technical staff provides individual dedicated assistance; analyses specific contexts and supports the customer to identify a custom-made solution.

For consultancy it is essential to provide all data exactly and completely (both on the environment and on the application).

Our technicians assist the customer in the choice

Our technical staff is at your complete disposal to identify your ideal heat exchanger. We individually analyse your specific needs and the context in which the heat exchanger will be installed.

After sales

ThermoKey stays at your side for the entire duration (life cycle) of the product for replacement of spare parts and technical assistance.

Some references on specific customer needs

Heat pump dry cooler tailored inclination to customer's need

Heat pump Dry Coler

applayng thermokey stickers on drycooler

Fish processing

Special packaging