Installations in the field of heating and refrigeration, namely installations for generating energy, cold, heat, compressed air, and for distributing these media, included in this class; trigeneration installations; apparatus and instruments for refrigerating, heating and transmitting heat; heating and cooling systems; apparatus and instruments for processing gas, namely for dehumidifying and drying using cold; auxiliary units for gas engines and combined heat and power plants; refrigeration machines, including electric refrigeration machines; cryo-refrigeration machines; refrigerating apparatus; refrigerating and air conditioning installations and/or apparatus; refrigerating machines; refrigerated cabinets; walk-in coolers; heat pumps; heat regenerators; heat accumulators; heat exchangers