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Corrosion-resistant active cooling unit

Intertec announces an innovative active cooling solution for small outdoor electronics and instrumentation equipment cabinets sited in hot climates. The company believes that MULTICOOL 1100 is the first to feature a GRP (glass reinforced polyester) housing that is inherently resistant to corrosion – most comparable products are contained in metal enclosures that are susceptible to this problem.

Offering 1100 watts of cooling power – enough to cool many types of high power field equipment – the MULTICOOL 1100 is a completely self-contained module that mounts directly on the outside wall of the equipment cabinet. It is especially suitable for cooling outdoor cabinets that are sited in hot and humid environments, and wherever atmospheric contaminants such as salt, sulphur or carbon dioxide exacerbate metal corrosion. Typical applications include temperature regulation of field-based sample conditioning and process analyzer instrumentation, and cooling the type of small distributed electronic control and monitoring systems used in many civil engineering projects.

A key feature of the MULTICOOL 1100 cooling unit is that there is no direct air path between the ambient environment and the inside of the equipment cabinet. The closed loop refrigeration system has two completely separate and thermally isolated compartments, one for its evaporator, the other for the condenser and compressor stages. The evaporator is the only part of the system that is connected to the inside of the cabinet, via air ducts that are hermetically sealed to the cabinet walls, and employs fan-assisted air recirculation to maximise cooling performance. Heat is extracted from the cabinet by air flow over the evaporator and transported to the condenser via refrigerant gas. The condenser is cooled by its own separate fan, with the hot air and waste heat from the compressor being exhausted direct to atmosphere.

This design approach has important advantages. Locating the entire cooling unit outside the cabinet means that it does not contribute to the amount of heat that needs to be removed from the interior, resulting in more efficient operation and lower running costs. And because it takes up no space inside the cabinet, the overall installation can be made smaller and more thermally efficient. Another key benefit is that the evaporator compartment is fully sealed against the ingress of dust and water.


  • Raffineriestraße 8, 93333 Neustadt an der Donau, Germany
  • INTERTEC-Hess GmbH