A complete chiller range can now use non-flammable HFC/HFO azeotrope R-513A as an alternative to HFC-134a. The GWP of 631 is less than half that of HFC-134a and has the same A1 refrigerant safety classification. The chillers use the same compressor types, and achieve almost the same refrigeration capacity and energy efficiency as with R-134a. The chiller range can also use HFO-1234zeE, which has a A2L safety classification (mildly flammable) and a GWP of <1 (AR5 value) and this refrigerant has been used for what is claimed to be the world’s largest fleet of chillers with a total refrigeration capacity of 10 megawatts, installed at a major hospital in Australia.
The chillers for the hospital were adapted to their specific environment and provided optimal integration into the existing hydraulic system. The chillers are characterised by their soft start-up (low start-up currents), low noise and vibration operation. The use of state-of-the-art electrical filter technology supports operational reliability and safeguards highly sensitive hospital equipment against electrical faults. The multiple compressor configuration in each chiller ensures high availability at all times. The oil-free and magnetic bearing compressor technology incorporated is characterised by hardwearing operation.
Source: Cooling Post & manufacturer’s information