Equipment housing without walk-in facility.

Nowadays, the no walk-in cabinets are the broadcasting equipment housings increasingly used thanks to their reduced dimensions and energy consumption.

These infrastructures involve easy installation with reduced environmental impact and easy maintenance as well.

Wherever possible, passive air conditioning offers significant advantages in terms of noise, maintenance and energy-saving.

The vent and semi-passive system allows an internal increased heat dissipation and, at the same time, reduced need of electrical energy.

Celantel is open to design and provide a unique and customizable solution allowing the most suitable thermal protection.

Main cabinet typologies available:

  • Passively cooled cabinet.
  • Underground cabinet.
  • Actively cooled cabinet.
Cabinet Celantel

The Passive cabinet

When the air conditioning does not depend on the energy supply – ZERO ENERGY.


  • Watertight internal room.
  • Absence of moving mechanical parts.
  • Absence of pressurized fluids.
  • Hydraulic circuit perfectly sealed (watertight).

The related application concerns remote stations, or any other without the possibility of maintenance.

Operating criteria – The Thermal Diode and the Thermal Condenser

In order to make the air conditioning independent from any energy source, it is unavoidable to draw the energy made available by the environmental climatic conditions.

The passive system uses the thermal energy available during the night, moving and collecting it inside and releasing it during 24 hours.

Celantel uses a patented device having two peculiarities: it is perfectly sealed so that it doesn’t need any replacement during the operational stage and it is modular type. A fluid is employed as thermal vector and store function.
Each passive cabinet is divided into:

  • The tank/Internal heat exchanger.
  • The external heat exchanger.

The first one controls the internal thermal energy and, thanks to a suitable accordion shape and a position, functional to the thermal flows, it allows the expected heat absorption. In some circumstances, the store function is integrated by adding specific products i.e. Phase Change Materials (PCM).
The second, therefore, is typically on the top of the cabinet so that it is easy to be cleaned and it is configured in order to maximize the heat exchange through the conduction to the environment and through the radiation to the outer space, introducing in this way nocturnal sub cooling effects.

The passively cooled cabinet follows the operational procedures of a diode (thermal), allowing the internal heat transfer towards the external and not vice versa.

thermal en
    The heat generated by the internal systems, added up to the contribution given by the environmental stress, is accumulated in the tank through the internal tank/exchanger, warming in this way the liquid stored inside.
    The fluid inside the external exchanger cools down, starting the circulation process in the closed circuit (natural convention), till its complete regeneration.

Project Criteria

The calculation method is essentially based on the difference between the minimum external night temperature and the maximum inside one allowed by the electronic devices.

This calculation uses a complex algorithm developed by Celantel.

Moreover, It could depend on the specific temperatures of the place taken into considerations, certified by the global databases, or on the project requirements, allowing an accurate evaluation of all the manufacturing parameters of the passively cooled cabinet and providing as well the graphics of the performance expectations.

Project Criteria

The active cabinet

When the air conditioning uses systems activated electrically and/or devices allowing the air inlet / outlet.


  • Temperature management fully controlled by air conditioning.
  • Ventilation with direct air input.
  • Possible split units installation, integrated or roof type.

The cabinet body is manufactured either with unframed composite panels (Fiberglass or Aluminum) or with framed type steel structures.

PUC – Passive Underground Cabinet

When design criteria ask for equipment housings that are temperature controlled, intrinsically protected against vandalism acts, reduced impact on landscape and  environment the solution is a Passive Underground Cabinet.

The design criteria adopted emphasizes the installation and operational aspects, both on the life cycle cost side and those related to the maintenance.

Technical Characteristics

The module is composed of two parts, one laid down in the precasted concrete and the cabinet inserted in it.

The latter can be easily erected by means of proper device and both consitute an unique assembly able to ensure:

  • temperature control with zero energy consumption and zero maintenance;
  • compact and functional housing for equipment and battery;
  • cabinet erection ensuring easy access to the operations required;
  • total tightness and extreme compactness;
  • zero impact on the environment both aesthetically and energy wise

Moreover, additional characteristics are the following:

  • the housing will be tailored based on the specific design requirements;
  • to fit the equipment in the cabinet the 19 inches rack can be utilized.

Thermal cycles and behaviour