Importance

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Abstract

An uninterruptible power supply (UPS) system (3) is to be inserted between a alternating current (AC) power supply (4), interruptions of which are to be compensated for, and at least one load (5), which is to be supplied with alternating current (AC) or direct current (DC). The system comprises a housing (6); at least one electrical or electronic component (14-16), located within the housing (6), electric energy being partially transformed into heat energy upon a power current flowing through said electrical or electronic component (14-16); cooling air transport means (20) for sucking cooling air (21) into the housing (6), for circulating the cooling air (21) within the housing (6) and for blowing the cooling air (21) out of said housing (6) to remove the heat energy; a passive heat exchanger (7) for withdrawing the heat energy from the cooling air (21) being blown out of said housing (6) and for transferring the heat energy into another cooling medium; and control means (17) switching the UPS system (3) from a first operation mode into a second operation mode, when a temperature sensor (22) at the heat exchanger (7) detects a temperature which is above a predetermined threshold value. In the first operation mode of the UPS system (3), the cooling air (21) blown out of said housing (6) enters said passive heat exchanger (7), and is then sucked out of the heat exchanger back (7) into the housing (6); said housing (6), said heat exchanger (7) and any pipes (8) inserted there between being sealed against the surroundings (28) in the first operation mode. And in the second operation mode of the UPS system (3) the cooling air (21) is blown out of the housing (6) into the surroundings (28) of the housing (6) and then being sucked out of the surroundings (28) of the housing (6) back into the housing (6). According to the invention said housing (6) and said heat exchanger (7) are located within an inner room (1) of a building, the surroundings (28) of the housing (6) being limited to the volume of the inner room (1), and said heat exchanger (7) is connected to a standard heat removal system of the building (8-10).

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First Claim