Especially in the automotive industry, sustainability plays an important role. Automotive companies give greater attention to topics like environmental protection and security. In order to fulfill their social responsibility, Volkswagen relies in its production process in Wolfsburg on air dryers of thermea.Energiesysteme equipped with transcritical GEA CO2 compressors.

Air-dryers with GEA compressors for dehumidifying of compressed air in the production process

Since 2013, Volkswagen uses air-dryers of thermea. Energiesysteme GmbH for dehumidifying of compressed air in the production process in Wolfsburg. The air-dryer uses the environmentally-friendly refrigerant R744 (CO2).

R744 is climate neutral and its Global Warming Potential (GWP) is 1300 times lower than the common fluorocarbon refrigerant R134a. Besides, the refrigerant R744 is non-flammable and poses only minimal security requirements (A1 safety classification).

The compressed air refrigeration dryers thermeco2 are equipped with four reciprocating transcritical HG34 CO2 T GEA compressors. In addition to a reliable dehumidifying of compressed air, the application also ensures cost advantages by using the benefits of heat recovery: The heat energy that is extracted from the compressor air during the condensation process can be won back on a high temperature level.

Through this heat recovery, which is possible through transcritical process management of the refrigerant CO2, supply temperatures of up to 90°C can be reached. Thus, operators have to expend less primary energy when generating heat for the production process. Thanks to the heat recovery, the air-dryers refinance themselves.