Patent ID: 7775061

Claim:
A unit arrangement having a receiving housing or a switchgear cabinet ( 30 ), in an interior of which electrical units ( 31 ) are accommodated and having a cooling unit ( 10 ) in air-conducting communication with the interior via at least one air inlet ( 14 ) and at least one blower aperture ( 13 ), and a cooling operation monitoring device, the unit arrangement comprising: the cooling operation monitoring device having an inlet temperature sensor ( 40 ) measuring a temperature of air to be cooled which is supplied to the cooling unit ( 10 ) via the at least one air inlet ( 14 ), an outlet temperature sensor measuring a second temperature of cooled air supplied to the interior via the at least one blower aperture ( 13 ), and a computing unit of the cooling operation monitoring device determining a temperature difference measured between the inlet temperature sensor and the outlet temperature sensor, a cooling medium supplied via a pilot line ( 44 ) to a cooling module ( 20 ) and discharged from the cooling module ( 20 ) via a return line ( 46 ), and a flow of the cooling medium controlled by a solenoid valve ( 45 ) as a function of an outlet temperature signal determined by the outlet temperature sensor ( 41 ).