An energy-efficient ventilation concept

Adiabatic cooling saves CO₂

Refrigeration is rarely perceived as a field of action to increase energy efficiency. This despite the fact that it often harbours significant cost reduction potential. In collaboration with agiplan, KROHNE realised an innovative cooling and ventilation system that requires very little additional power.

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Joachim Frey

Joachim Frey Project Lead Architecture

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agiplan's services

  • Supply analysis
  • Concept for ventilation of production halls
  • Planning an economical and energy-efficient ventilation system with adiabatic cooling
  • Implementation support

KROHNE is a worldwide leading manufacturer and supplier of industrial process instrumentation. The measurement systems are deployed in such diverse industries as oil and gas, food and beverages, mining and maritime shipping.

Since its foundation in 1921, the company has continuously developed and today operates internationally with more than 3,500 employees. In 2012, KROHNE required better ventilation for two older production halls at its Duisburg headquarters and commissioned agiplan with designing and implementing an energy-efficient ventilation system.

No way in for dirt and heat

Up to now, exhaust fans were turned on whenever the temperature rose in the production halls of the 70s. However, the vacuum let air flow in uncontrollably through doors and windows, and brought dirt and heat into the production facility.

"The supply air needed to be cooled," says agiplan's Arno Ostwald. "But given that traditional compressor refrigeration systems are expensive and harmful to the environment, we found another solution."

Adiabatic cooling: cooling without power

The solution consisted of two air supply systems with adiabatic cooling. Water is brought to evaporate, thereby generating refrigeration. Unlike conventional air-conditioning systems, no additional power is required for this process. The evaporative cooling effect improves the indoor climate - entirely without electrical energy. The benefits: Low operating costs and annual savings of several tons of CO2.

Production manager Matthias Schultheis is satisfied: "In addition to significantly lower operating costs, the system also promises to reduce emissions by several tonnes of CO? per year. This allows us to contribute to climate protection."


employees at facility
m² plain
months runtime
EUR investment
Industrial Consulting - KROHNE




Joachim Frey

Joachim Frey

Project Lead Architecture