Abstract: The invention relates to a method for regulating a cooling system for cooling electrical built-in devices housed in control panels or racks by means of cooling units assigned thereto, through which a liquid cooling medium, cooled down from a return temperature to a flow temperature by means of a cooling apparatus of the cooling system flows, wherein a cooling power for cooling the built-in devices can be regulated by a primary reference variable according to specification. Energy-efficient cooling is achieved in that the flow temperature is variably adjusted according to a cooling power demand in the region of the built-in devices, wherein the primary reference variable is formed from the cooling power demand in the region of the built-in devices.

Abstract: The invention relates to a method for controlling an air conditioning system for a data processing facility that comprises at least one row of server switch cabinets, wherein the row of server switch cabinets bounds a cold aisle that is sealed off from a hot aisle facing away from the cold aisle side, wherein hot air is drawn in, cooled, and blown into the cold aisle by at least one air conditioner, and wherein cold air is drawn out of the cold aisle and fed into the hot aisle or into the surrounding space by at least one of the server switch cabinets. The invention further relates to a corresponding device for performing the method. According to the invention, the control of the air supply rate of the air conditioner is performed by means of a pressure controller, wherein a measured pressure difference between a pressure sensor in the cold aisle or in the hot aisle and a pressure sensor in the surrounding space outside the cold aisle or the hot aisle is used as an input variable of the pressure controller.