Since 2008 we have been providing systems for waste heat recovery for transcritical CO2 refrigeration plants. Now with more than 750 systems installed with over 2,000 installed heat exchangers (as of March 2020), throughout Europe we are at the pinnacle of CO2 heat recovery solutions.
The DK evaporator for CO2; is now in its 5th year of manufacturer; and is becoming the Engineers first choice.

DK-Heat recovery systems for CO2 refrigeration plants

We were involved in the renaissance of carbon dioxide (R744) as a natural refrigerant at the beginning of the new millennium from the very beginning. After all, it was immediately clear: CO2 refrigerant is perfectly suited for heat recovery due to its high temperatures.

The demand for solutions for waste heat recovery from subcritical and transcritical CO2 refrigeration systems came from the supermarket sector. In February 2008 we therefore presented our heat recovery system with TÜV approval for a pressure of 130 bar at 150°C at the EuroShop supermarket trade fair in Düsseldorf. The interest was great and the first inquiry from a German supermarket reached us the following month.

Today, more than ten years later, we offer different systems for using waste heat to heat drinking water, heating water or to combine both in only one tank.

Further information about our systems can be found in the > Downloads or in



With internal, double walled heat exchangers - storage system

With internal, single walled heat exchangers and additional stainless steel heat exchanger - flow rate

With external, double walled heat exchangers - storage system

With internal, eingle walled heat exchangers

With internal, single walled heat exchangers and additional stainless steel heat exchanger - flow rate

Advantages of CO2-applications

DK-Shell-and-tube evaporator
for transcritical CO2-units

The DK chiller with CO2 evaporator installed in a DK storage tank is becoming increasingly popular. Several DK chillers are already in operation – for example, in a supermarket for cooling water recooling for plug-in water-cooled refrigerated cabinets or in bakeries in Austria and Belgium with CO2 chillers for dough water cooling.

Do you have any questions or are you interested?

Our experts will be happy to advise you on the subject of heat recovery for CO2-refrigeration systems. Based on your company, we go through the options for integration and promotion, as well as for savings. Contact us today and benefit from heat recovery. We look forward to your inquiry.

Martin Thier
inside sales

Non-binding offer request
Bernd Schröer