Application
This unit involves the skills and knowledge required to design commercial refrigeration systems and select components. It includes applying processes and methods of refrigeration and food storage technology, refrigeration system components and piping, and safety and regulatory requirements. It also includes following design specifications and customer requirements, documenting system designs and obtaining approval for engineering computer applications design. The skills and knowledge described in this unit may, in some jurisdictions, require a licence or permit to practice in the workplace subject to regulations for undertaking refrigeration and air conditioning work. Practice in the workplace and during training is also subject to work health and safety (WHS)/occupational health and safety (OHS) regulations. No other licensing, legislative or certification requirements apply to this unit at the time of publication. |
Elements and Performance Criteria
Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. | ||
WHS/OHS procedures are identified, obtained and implemented in accordance with workplace procedures | |||
Scope of the refrigeration system is identified from design specifications | |||
System safety, regulatory and compliance requirements are identified and applied | |||
Work supervisor and/or customer/s are consulted to determine functions and parameters of the system in accordance with relevant documentation | |||
Design development work is planned in consultation with relevant person/s involved to meet scheduled timelines | |||
WHS/OHS risk control measures and procedures are followed in accordance with workplace procedures | |||
Relevant refrigeration, food storage, technology refrigeration system components, piping and performance standards are applied to the system design in accordance with relevant industry standards | |||
Safety, functionality and budgetary considerations are incorporated in the design specifications | |||
Equipment required is selected in accordance with design specifications and workplace procedures | |||
Location of components in the system is documented in accordance with workplace procedures and operation of system functions | |||
System design draft is checked for compliance in accordance with design brief and relevant industry standards | |||
System design is documented and submitted to relevant person/s for approval in accordance with workplace procedures | |||
Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures | |||
System design is presented to customer and/or relevant person/s in accordance with workplace procedures | |||
Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures | |||
Final design is documented and approval obtained from relevant person/s in accordance with workplace procedures | |||
Quality of work is monitored in accordance with workplace procedures and relevant industry standards | |||
Evidence of Performance
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. |
Evidence of Knowledge
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. |
Assessment Conditions
Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment. Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment. Assessment must occur in suitable workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated suitable workplace operational situations that replicate workplace conditions. Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate. Resources for assessment must include access to: a range of relevant exercises, case studies and/or simulations relevant and appropriate materials, tools, facilities and equipment currently used in industry applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals. |
Foundation Skills
Foundation skills essential to performance are explicit in the performance criteria of this unit of competency. |
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 |
Sectors
Electrotechnology |
Competency Field
Refrigeration and air-conditioning |