2025-07-29 HVAC/R
How KRIWAN masters the challenges of modern HVAC/R systems
The global trend toward natural refrigerants such as CO₂ and hydrocarbons poses new challenges for the HVAC/R industry - from icing in CO₂ systems to the flammability of propane and high compression temperatures. KRIWAN is responding with innovative solutions and a clear focus on safety, efficiency, and sustainability.
With its new level sensors for natural refrigerants, KRIWAN is specifically addressing the technical hurdles associated with these technologies. CO₂ systems in particular require a robust design – icing is difficult to simulate in the laboratory and poses real risks in the field. Thanks to decades of experience in the development of HVAC/R components, KRIWAN has been able to further develop its level sensors in a targeted manner.
Particular attention was paid to the selection of materials: the plastic compounds used and the geometric sensor design ensure optimum temperature gradients and reliably protect sensitive electronics – even at high discharge temperatures. At the same time, attention was paid to safe use with flammable refrigerants such as propane.
Europe plays a central role in the transition to natural refrigerants, but development has long been global. Companies around the world are investing in R&D projects related to low-GWP refrigerants. There are many reasons for this: longer service life of the systems, reduced operating costs, and regulatory pressure.
KRIWAN is seeing strong growth, particularly in sensors for heat pumps, air conditioning systems, and commercial refrigeration. The economic advantages are obvious—systems designed for natural refrigerants from the outset pay for themselves more quickly and are future-proof.
“Our many years of experience in refrigeration technology were crucial in developing robust solutions for CO₂ and propane systems. Extreme conditions in particular demonstrate how important it is to choose the right materials and conduct practical tes
– Dr. Christian Ellwein, CEO KRIWAN Industrie-Elektronik GmbH
A key area of development at KRIWAN is variable speed drives (VSDs), which are specially designed for rotating components such as compressors, pumps, and fans. The focus here is on operability at high ambient temperatures - a clear advantage in minimizing failure rates and maximizing equipment reliability.
Another trend is artificial intelligence in sensor technology. Increasing amounts of measurement data – such as vibrations or two-phase mixtures – require complex algorithms. KRIWAN relies on smart evaluation to further increase safety and efficiency in refrigeration and air conditioning technology.
One particularly innovative project is the new optical two-phase sensor, which is currently being developed in collaboration with a university. The aim is to detect liquid in the suction line and thus protect compressors from dangerous liquid slugging. At the same time, the sensor helps to optimize overheating – a key element in the efficiency of refrigeration systems. The prototypes are already undergoing field testing.
At Chillventa 2024, it became clear that natural refrigerants are no longer a niche product – they are the future. The industry is developing rapidly, and technical hurdles are gradually being overcome. The biggest challenge currently lies in the expertise of skilled workers: new technologies require new skills in handling systems, planning, maintenance, and safety.
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