Uninterruptible power supply (ups) system with primary air cooling

Abstract

An uninterruptible power supply (UPS) system ( ) is to be inserted between a alternating current (AC) power supply ( ), interruptions of which are to be compensated for, and at least one load ( ), which is to be supplied with alternating current (AC) or direct current (DC). The system comprises a housing ( ); at least one electrical or electronic component ( ), located within the housing ( ), electric energy being partially transformed into heat energy upon a power current flowing through said electrical or electronic component ( ); cooling air transport means ( ) for sucking cooling air ( ) into the housing ( ), for circulating the cooling air ( ) within the housing ( ) and for blowing the cooling air ( ) out of said housing ( ) to remove the heat energy; a passive heat exchanger ( ) for withdrawing the heat energy from the cooling air ( ) being blown out of said housing ( ) and for transferring the heat energy into another cooling medium; and control means ( ) switching the UPS system ( ) from a first operation mode into a second operation mode, when a temperature sensor ( ) at the heat exchanger ( ) detects a temperature which is above a predetermined threshold value. In the first operation mode of the UPS system ( ), the cooling air ( ) blown out of said housing ( ) enters said passive heat exchanger ( ), and is then sucked out of the heat exchanger back ( ) into the housing ( ); said housing ( ), said heat exchanger ( ) and any pipes ( ) inserted there between being sealed against the surroundings ( ) in the first operation mode. And in the second operation mode of the UPS system ( ) the cooling air ( ) is blown out of the housing ( ) into the surroundings ( ) of the housing ( ) and then being sucked out of the surroundings ( ) of the housing ( ) back into the housing ( ). According to the invention said housing ( ) and said heat exchanger ( ) are located within an inner room ( ) of a building, the surroundings ( ) of the housing ( ) being limited to the volume of the inner room ( ), and said heat exchanger ( ) is connected to a standard heat removal system of the building ( ).