R290 chillers and R600a heat pumps replacing a R22 system in a hospital

The case study presents findings of a project for the Åarhus University Hospital, Skejby where the first hydrocarbon chillers were installed in 2003. As the hospital has been expanding over time, new R290 units have subsequently been added. The latest installation in November 2010 also included two heat pumps based on iso-butane (R-600a). In addition to the 9 chillers, special application chillers have been working at different temperature levels. In total, 15 chillers are currently operating on site. All systems were supplied by Johnson Controls. The chillers were installed in a separate courtyard with no access for the public and unauthorised personnel.