22 September 2011
In 2003, Trondheim Energi Fjernvarme AS started to deliver district cooling at St. Olavs Hospital, which is a new University hospital in Mid Norway. Stage one of the district cooling plant consists of one 3 MW absorption chiller and two compressor chillers. The total cooling capacity is 7 MW.
In 2007, the new hospital buildings covered 100 000 m2 floor area. The annual cooling load was 6 600 MWh, where 67% was covered by “free cooling” from river water, and 30% was
covered by the absorption chiller. During this summer, the compressor chillers covered only 3% of the cooling demand. Hence, this is a cooling system with little environmental impact.
In 2009, the new hospital buildings approached 200 000 m2 floor area, and during the warmest summer days the chiller plant operated at 100% capacity. The annual cooling load had increased to 10 000 MWh. About 70% of the cooling was covered by “free cooling”, while the absorption chiller covered about 20% and the compressor chillers 10% of the cooling demand.
In order to reduce the use of the electrically driven compressor chillers, a new 3 MW absorption chiller will be installed prior to the 2011 summer cooling season.