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Elements and Performance Criteria

1. Prepare to design complex air conditioning systems
   • WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied
2. WHS/OHS risk control measures and workplace procedures are followed in preparation for the work
3. Scope of the refrigeration system is determined from the design brief and/or consultations with relevant person/s
4. Design development work is planned in accordance with workplace procedure for timelines in consultation with others involved
5. Design complex air conditioning systems
   • Relevant complex air conditioning processes and methods are applied to the design
6. Alternative concepts for design are evaluated in accordance with the design brief
7. Safety, functionality and budgetary considerations are incorporated in the design specifications
8. System design draft is checked for compliance in accordance with the design brief and relevant industry standards
9. System design is documented for submission to relevant person/s for approval
10. Unplanned events are dealt with in accordance with problem solving techniques and workplace procedures
11. Obtain approval for complex air conditioning systems design
    • System design is presented to customer and/or relevant person/s
12. Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures
13. Final design is documented and approval obtained from relevant person/s in accordance with workplace procedures
14. 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 a complex air conditioning system must include at least the following:	one major component, including: air handling plant compressors condenser evaporators circuits and/or systems 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:

developing outlines of alternative designs developing the design within the safety, regulatory, 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 (WHS/OHS) requirements, including using risk control measures designing complex commercial refrigeration system preparing to design complex air conditioning system.

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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:

complex heating, ventilation and air conditioning (HVAC) system design, safe working practices and relevant standards, codes and regulations, including: HVAC load estimating of multiple zone and multi-storey buildings: system design parameters: human comfort system requirements in accordance with AS 1668 The use of ventilation and air conditioning in buildings SAA refrigeration code heat transfer calculations for complex structures and building components heat and radiation transfer calculations through complex glass structures including various internal and external shading devices indoor air quality olfs and decipols complex shading: solar data, azimuth and altitude angles shading from adjacent structures computer software: heat load estimating building thermal performance analysis and simulation software advanced psychrometrics: complex psychrometric processes: revise sensible cooling and heating and evaporative (adiabatic) cooling cooling and dehumidification cooling and dehumidification with high latent load cooling and dehumidification all outdoor air cooling and dehumidification all outdoor air with dehumidified air requirements less than supply air cooling with evaporative humidification cooling with near isothermal humidification spray process to include cooling and dehumidification, cooling and humidification with heated spray water, heating and humidification partial load processes reheat bypass of, RA only and mix of RA and OA variable air volume variable coil effective surface temperature split coil, horizontal, vertical and intertwined system performance: saturation efficiency of sprayers system capacity calculated from air quantity and enthalpy change required plant capacity and airflow rates: effects of coil bypass factor and ADP calculation of dehumidified air quantity, using both TSH and ERSH methods recap on psychrometrics formulae and charts: properties of air gas constants derivation of air constants combined gas laws Dalton’s law of partial pressures carrier’s equation psychrometric property tables psychrometric charts air mixing equations air quantity equations indirect evaporative coolers analysis of cooling coil selection and performance psychrometric analysis of: air conditioning in tropics all outdoor air LCV/HWF systems psychrometric analysis using equations and tables air conditioning system design: design parameters for multi-storey building: customer and objective customer concept of environment desired economic client brief relevant design criteria: building purpose, location, orientation and shape external environment ambient conditions internal load diversity thermal capacity behaviour thermal load (full and partial) zoning and building usage: space and building occupancies, single purpose and multi-purpose system selection criteria: economics environment control requirements existing structures new structures system components space for equipment and system selection of appropriate system system and applications: design features, engineering procedures and controls direct expansion - self-contained room/zone, heat pump, multi-zone fan-coils and central station all water - room fan-coil all-air - constant volume variable temperature, face and bypass, reheat, constant temperature variable volume, constant volume induction, dual-duct and dual-conduit air water - induction unit and primary air fan-coil HVAC energy conversation techniques: heat recovery systems night cycle optimum stop/start purge cycles chiller/boiler/cooling tower sequencing economy cycles (based on temperature or enthalpy) supply air reset supply water reset condenser water temperature reset power demand control load limiting load shedding set point relaxation ventilation cycles plant - fixed OA to economy, boiler to electric reheat and constant volume to variable air volume (VAV) cost-benefit (payback) problem-solving techniques relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace budget, quality, policies and procedures relevant workplace documentation.

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