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Elements and Performance Criteria

1. Prepare to design CO² refrigeration systems
   • WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied
2. Scope of the refrigeration system is determined from design specifications and/or consultations with relevant person/s
3. Safety and system are identified, obtained and applied in accordance with relevant industry standards
4. Work supervisor and/or customer/s are consulted to determine functions and parameters of the system required in accordance with design specifications and workplace documentation
5. Design development work is planned in accordance with workplace procedures for timelines in consultation with others involved
6. Design CO² refrigeration systems
   • WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
7. Relevant CO² refrigeration system analysis, components and piping are applied to developing the system design in accordance with workplace procedures and relevant industry standards
8. Safety, functionality and budgetary considerations are incorporated in the installation specifications
9. Equipment required is selected in accordance with the design specifications and workplace procedures
10. Location of components is documented in accordance workplace procedures and operation of system functions
11. System design draft is checked for compliance in accordance with the design brief and relevant industry standards
12. System design is documented for submission to relevant person/s for approval
13. Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures
14. Obtain approval for 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 CO² refrigeration systems must include at least the following:	two of the following: two sub-critical or two trans-critical or one sub-critical and one trans-critical major components: cooler 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 negotiating design alteration requests successfully obtaining approval for final design dealing with unplanned events applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including using risk control measures designing carbon dioxide (CO²) refrigeration systems preparing to design CO² 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, and performance criteria and range of conditions and include knowledge of:

CO² refrigeration system design requirements, components and piping design requirements, safe working practices and relevant standards, codes and regulations, including: technical standards, regulations and codes for carbon dioxide refrigeration systems: standard philosophy and format standards, regulations and codes that apply to CO2 refrigeration systems equipment manufacturer's specifications CO² refrigeration system design requirements: possible areas of applications of CO2 refrigeration systems: mobile air conditioner heat pump water heater commercial refrigeration thermodynamic properties of CO2: CO2 phase diagram CO2 properties tables and chart conventional refrigeration cycle versus CO2 refrigeration cycle: T-s and pH diagram representations isentropic efficiency volumetric efficiency types of CO2 refrigeration system configurations: sub-critical operation trans-critical operation cascade systems performance analysis of CO2 refrigeration systems sub-critical cycle trans-critical cycle cascade systems CO² refrigeration system components and piping: design preliminaries: system operating parameters project specifications equipment selection criteria selection tables, charts and catalogues heat exchanger selection: selection of evaporators selection of condensers selection of coolers compressor selection liquid expansion devices selection system load balance point refrigeration line design and sizing automatic controls safety devices problem-solving techniques 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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