complex commercial refrigeration system design, safe working practices and relevant standards, codes and regulations, including: commercial refrigeration system types: medium and low temperature applications operating conditions system operating and service requirements refrigerant types components multiple evaporator systems multiple temperature systems multiple compressor (rack) systems two stage compressors multiplex systems defrost requirements and methods electric defrost systems hot gas defrost systems cool gas defrost systems manufacturer's data: rating tables selection tables catalogues operating characteristics: effects of temperature glide with blended refrigerants pH charts refrigerating effect heat of compression heat rejected on high side of the system required mass flowrate of refrigerant volume flowrate at various points in system theoretical compressor power required condenser capacity refrigerant flow controls: refrigerant regulating valves solenoid valves expansion valves pressure regulating valves automatic systems controls: cycling controls pressure-stats thermo-stats defrost controls monitoring and alarm controls energy management systems refrigeration automation system control strategies control modes system design: required cooling capacity per day running time and required system cooling capacity system capacity control for peak and low load refrigeration system diagrams refrigerant, equipment, major component, controls, piping and accessory selection problem-solving techniques relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace budget, quality, policies and procedures relevant workplace documentation. |