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Elements and Performance Criteria

1. Prepare to design commercial refrigeration systems
   • WHS/OHS procedures are identified, obtained and implemented in accordance with workplace procedures
2. Scope of the refrigeration system is identified from design specifications
3. System safety, regulatory and compliance requirements are identified and applied
4. Work supervisor and/or customer/s are consulted to determine functions and parameters of the system in accordance with relevant documentation
5. Design development work is planned in consultation with relevant person/s involved to meet scheduled timelines
6. Design commercial refrigeration systems
   • WHS/OHS risk control measures and procedures are followed in accordance with workplace procedures
7. Relevant refrigeration, food storage, technology refrigeration system components, piping and performance standards are applied to the system design in accordance with relevant industry standards
8. Safety, functionality and budgetary considerations are incorporated in the design specifications
9. Equipment required is selected in accordance with design specifications and workplace procedures
10. Location of components in the system is documented in accordance with workplace procedures and operation of system functions
11. System design draft is checked for compliance in accordance with design brief and relevant industry standards
12. System design is documented and submitted to relevant person/s for approval in accordance with workplace procedures
13. Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures
14. Obtain approval for commercial refrigeration systems design
    • System design is presented to customer and/or relevant person/s in accordance with workplace procedures
15. Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures
16. Final design is documented and approval obtained from relevant person/s in accordance with workplace procedures
17. Quality of work is monitored in accordance with workplace procedures and relevant industry standards

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.
Designing commercial refrigeration systems must include at least the following:	two different commercial refrigeration systems with one of the following: condenser compressor evaporator associated components and controls

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

understanding required operating functions and parameters from the design specification developing the design within the safety, regulatory and functional requirements and budget limitations documenting and presenting design effectively successfully negotiating design alteration requests obtaining approval for final design dealing with unplanned events applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including using risk control measures designing commercial refrigeration systems preparing to design commercial refrigeration systems.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

commercial refrigeration system design, safe working practices and relevant standards, codes and regulations, including: food spoilage and possible causes: physical damage animal activity chemical breakdown enzyme activity microorganisms effects of temperature change effects of humidity change effects of freezing on fresh produce effects of slow freezing time effect of refreezing food preservation: removing or taking out a reactant removing or inactivating the catalyst reducing temperature changing the reaction system irradiation microorganisms: conditions for growth potentially hazardous foods cross-contamination identification of food spoilage: recognition and suggest possible cause physical damage animal activity chemical breakdown enzyme activity microorganisms types of heat processing techniques: heat processing using steam and water blanching pasteurisation sterilisation evaporation heat processing using hot air dehydration baking and roasting types of chilling processing techniques: chilling and controlled atmosphere storage freezing freeze drying and freeze concentration modified atmosphere combined with low temperature cryovac equipment manufactures specifications and practices refrigeration system components and piping selection, safe working practices and relevant standards, codes and regulations, including: relevant industry practices: AS/NZS 1677 Refrigerating systems SAA refrigeration code AS/NZS 3666 Air-handling and water systems of buildings ozone protection regulations IIAR ammonia data book ANSI/IIAR standards ANSI/ASHRAE mechanical refrigeration and IIAR bulletins and standards equipment manufacturer’s specifications and practices 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 and medium and low back pressure compressors selection tables, motor selection liquid expansion devices: 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 velocity tables pressure drop in lines and fittings oil migration stabilisation refrigerant velocity effect of varying system capacity oil traps risers double risers liquid migration design for parallel components and multiplex systems automatic controls: fin spacing, suction temp to evaporator suction hot-gas bypass valves electronic control of valves and programmable logic controllers (PLC) 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 job safety assessments or risk mitigation processes relevant WHS/OHS legislated requirements relevant workplace budget, quality, policies and procedures relevant workplace documentation.

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