Evidence shall show that knowledge has been acquired of safe working practices and analysing the thermodynamic performance of HVAC/R systems. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EJ193A Refrigeration systems Evidence shall show an understanding of introduction to refrigeration systems, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: T1. Major components, type and functions: evaporators compressors expansion devices ancillary components refrigerants T2. System operation and performance: thermodynamic properties of refrigerants pressure enthalpy charts refrigerant cycle refrigerant cycle represented on pH charts introduction to refrigerating effect, heat of compression, heat rejected on high side, co-efficient of performance, liquid sub-cooling suction superheating effects on performance of changing operating pressures, liquid sub-cooling, suction superheating T3. Application of refrigeration: introduction to industrial refrigeration, specific system component types and refrigerants applied. scope of commercial refrigeration, specific system component types and refrigerants applied T4. Refrigerated enclosures and cabinets: merchandising and display cabinets: deep freeze meat dairy fruit and vegetable multi-deck display single deck well type island cases glass door reach door reach in merchandisers defrosting methods cold rooms and freezer rooms types and construction insulation vapour barrier frost heave interior fittings location of equipment defrosting methods cold tracking trace heating storage conditions temperature relative humidity air velocity air patterns load limits KS02-EJ193A Air conditioning systems Evidence shall show an understanding of introduction to air conditioning systems, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: T1. Occupational health requirements: WH&S requirements BCA requirements AS1668 parts 1 & 2 AS3666 noise and vibration air quality sick building syndrome T2. Operating requirements: ventilation air distribution terminal velocity temperature relative humidity air quality noise basic psychrometrics T3. Operating modes ventilation evaporative cooling ventilation and cooling ventilation and heating dehumidification dehumidification dehumidification and reheat humidification T4. Operating terminology/characteristics: throw, drop primary and secondary air coanda effect T5. HVAC system components and functions: fans ducting registers dampers filters cooling coils heating coils induction units fan coil units terminal units humidifiers, pumps and sprayers hydronic systems and components T6. Applications and construction of air conditioning systems: applications residential, commercial, low and high rise, industrial ventilation and air conditioning packaged plant RACs, split systems (wall and floor console, ceiling fan coil), wall facia, roof top, reverse cycle option central station plant all air systems, constant volume variable temperature, constant temperature variable volume, air/water systems all water system, multi-zoning, thermal storage systems basic air conditioning system diagrams duct layout hydronic layout unit/conditioner drawings T7. HVAC control systems: basic principles terminology symbols and diagrams basic applications |