basic commercial refrigeration system equipment, components, accessories selection, piping selection, safe working practices and relevant standards, codes and regulations, including: calculation of capacity in heat exchangers: Q = UA (LMTD) Q = mc∆t Q = m ∆h evaporators: commercial types and applications coil bypass factor effects of evaporator TD on space humidity effects of air circulation on product conditions selection criteria and selection tables condensers: commercial types and applications effects of ambient conditions condenser control heat rejection factor condenser TD selection criteria and selection tables compressors: types and applications capacity displacement volume flow rate theoretical capacity total volumetric efficiency effect of operating conditions, including suction pressure drop and superheating actual capacity power theoretical requirement effects of operating conditions actual requirements post defrost loads pull down torque requirements, high, medium and low back pressure compressors selection tables, motor selection refrigerant flow controls: types, operation and applications effects from sub-cooling distributor types, operation and applications selection tables system load balance point: graphical representation line sizing and design: quick selection tables velocity tables pressure drop in lines and fittings oil migration stabilisation refrigerant velocity effect of varying system capacity oil traps risers liquid migration automatic controls: fin spacing, suction temp to evaporator suction hot-gas bypass valves electronic control of valves programmable logic controller (PLC) control refrigerant regulating valves solenoid valves condenser pressure regulating valves evaporator pressure regulating valves crankcase pressure regulating valves cycling controls pressure-stats thermostats defrost controls monitoring and alarm controls refrigeration automation systems control strategies control modes relevant industry standards, including industry practices and technologies relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures. |