Air Conditioning

The building is largely cooled by chilled water from a district cooling plant and in some areas by electrical driven split units. The chilled water supply is turned off during non-operational hours. Technical installations that require 24-hour cooling are cooled by electrical driven air-conditioning split units (ACSU) with manual temperature set-point.

The chiller plant is calculated to have a coefficient of performance of 4.8. The total cooling demand is the sum of the metered readings of the chilled water energy meter and a number of sub-meters for the air handling units, the air conditioning split units, and the fan coil units.



Energy Consumption for Air-conditioning in 2005

Breakdown of the cooling demand indicates that a high percentage of 32% is caused by the use of air conditioning split units and fan coil units, ACSU+FCU. This is attributed to the large number of electrical installations in the building, namely IT, telecommunication and office equipment, similar to most modern office buildings today, that require 24 hours cooling.

Breakdown of Total Cooling Demand

ACSU = Air-condition split unit
AHU = Air handling unit
CHW = Chilled water
FCU = Fan coil unit