Climate control for critical infrastructure using air-to-air heat exchangers

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In industrial applications, reliable cooling of electronic components is essential for ensuring functionality and operational availability. The Delta-IDL company – a name known for innovative solutions for heat dissipation and flow simulation—offers state-of-the-art products for this purpose. The air-to-air heat exchangers are designed to protect hardware in control cabinets under demanding climatic conditions. The operating principle is based on the exchange of thermal energy between two separate air streams to create an optimal thermal environment and maintain a stable temperature.

Function and Heat Transfer of Air Heat Exchangers

The function of these air heat exchangers is based on highly efficient heat transfer. The strict physical separation of the circuits effectively prevents the ingress of contaminants, dust, and ambient aerosols into the interior—in accordance with the respective protection class. Each unit achieves its rated capacity at a defined temperature difference. This ensures reliable results and long-term system stability in all cases.

Funktion und Wärmeübertragung der Luft-Wärmetauscher
Konzeptioneller Temperaturausgleich durch getrennte Luftführungen

Conceptual Temperature Equalization via Separate Air Channels

The temperature balancing concept is based on compressorless cooling using forced convection to dissipate power loss. The heated medium (the enclosure air or exhaust air) and the cooling outside air (as fresh air from the environment) circulate through powerful fans in separate systems. Direct contact between the media is consistently avoided. Optionally, a special filter can be used to additionally clean the outside air of coarse contaminants before it enters the external circuit.

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Modular Selection: Design, Types, and Scalability

Depending on the specific application, the spatial conditions at the installation site, and the amount of heat to be removed, the selection of different types of heat exchangers allows for a system design that precisely meets the requirements. All available performance classes offer an optimal solution for various industrial requirements:

SCS 949 175

SCS 19-949
Designed for outdoor use in confined spaces. The internal circuit provides reliable protection against dust and splashing water in accordance with IP54; higher protection levels are available upon customer request.
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SCS 755 175 WD

For noise-sensitive environments. A flow-optimized duct and blade design reduces air-side pressure drop and operates extremely quietly.
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SCS 2Kplus 190 & SCS 3Kplus 190 V

Designed for medium to high packing densities. In other high-performance applications, these models offer a specific cooling capacity of 120 W/K or more.
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Design and Materials for Harsh Conditions

The mechanical design meets the most stringent requirements for system stability. The enclosures are made of corrosion-resistant materials (such as aluminum, stainless steel, and plastics), ensuring structural integrity even in marine or chemically aggressive environments.

In terms of thermal management, the system offers a significant advantage: Since the internal temperature is always physically higher than the ambient temperature, the risk of condensation is minimized compared to active cooling units. Should the temperature nevertheless fall below the dew point under extreme transient conditions, condensation accumulates in a controlled manner inside the heat exchanger—and not on the sensitive electronics.

Konstruktion und Material für raue Bedingungen
Wirtschaftlichkeit und CO₂-Bilanz

Cost-Effectiveness and Carbon Footprint

This technology is characterized by high cost-effectiveness and low energy costs. Since no active refrigerant compressors are required, the system reduces energy consumption to the power needed to drive the fans. In addition, the use of refrigerants is eliminated (GWP = 0), which significantly improves the environmental footprint of the entire system and further reduces costs.

FAQ: Frequently Asked Questions About Air-to-Air Heat Exchangers

1. What is the main difference between this system and an active air conditioning system?
An air-to-air heat exchanger cools without a compressor. It utilizes the temperature difference between the warm air inside the enclosure and the cooler ambient air via forced convection (fans). A conventional air conditioning system, on the other hand, uses a refrigerant and a compressor to cool the enclosure to temperatures even below ambient, which, however, consumes significantly more energy.
2. In which environments is the use of stainless steel enclosures absolutely necessary?
Stainless steel (particularly alloys such as V4A) is required when the device is exposed to highly corrosive environments. These include, among others, offshore facilities (salty sea air), the food industry (aggressive cleaning agents), and the chemical industry.
3. How is the protection rating (e.g., IP54 and higher) maintained despite air circulation?
The system operates with two completely separate air circuits. Ambient air is directed through the heat exchanger but never enters the interior of the control cabinet directly. Heat transfer occurs exclusively via the thermally conductive partition walls (according to the counterflow principle) inside the unit.
4. Does condensation form during use?
The risk is minimal, as the air inside the cabinet is not cooled down below the ambient temperature.
5. Cross-flow vs. counter-flow principle: What are the differences?
We prefer the counter-flow principle due to its higher efficiency and more compact design. The main difference between the two principles lies in the direction of flow, which significantly determines the system’s efficiency:

In the counterflow principle, the media (e.g., exhaust and supply air) flow parallel to each other but in opposite directions. This enables highly efficient heat transfer with efficiencies often exceeding 90%, combined with a very compact design. The disadvantages, on the other hand, typically include higher initial costs and greater pressure loss. This principle is primarily used in modern residential ventilation systems with heat recovery.

In the cross-flow principle, the air streams meet at a right angle. Since the temperatures equalize more quickly, heat recovery is lower and the efficiency is below that of the counterflow principle. However, this variant offers a simpler design and lower pressure losses. However, a larger installation area is required to achieve the same performance. Typical applications include large ventilation systems with high airflow rates.

For further information and precise technical specifications regarding design tailored to your requirements, we recommend consulting our detailed data sheets.

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