Four HFC-134a chillers totaling 1.4 MW were installed in a British hospital to replace an outdated HCFC-22 screw compressors installation.
The new chillers provide cooling for the air-handling units that serve wards, administration areas and waiting rooms.
They are connected to the hospitals Building Management System, which controls chiller sequencing and runtime to equalize their operational hours in order to prolong their working life.
Remotely located air-cooled condensers require each chiller to be connected to its condenser by copper refrigerant pipework running beneath a road in a concrete-lined culvert. The piping, of an unusual length, is up to 75 m long and up to 92 mm diameter on the discharge and 67 mm on the liquid lines.
Source: MBS Modern Building Service-