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Elements and Performance Criteria

1. Prepare to determine heat loads for commercial refrigeration and/or air conditioning applications
   • Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures for a given work area are identified and applied
2. WHS/OHS risk control measures and workplace procedures are followed in preparation for commercial refrigeration/air conditioning work
3. Extent of heat load analysis is determined from project specifications and discussions with appropriate person/s
4. Activities are planned to meet scheduled timelines in consultation with other person/s involved in commercial refrigeration/air conditioning work
5. Effective strategies are determined to ensure solution development and implementation is carried out efficiently in accordance with workplace procedures
6. Determine heat loads for commercial refrigeration and/or air conditioning applications
   • WHS/OHS risk control measures and workplace procedures for carrying out commercial refrigeration/air conditioning work is followed
7. Specifications of commercial refrigeration and/or air conditioning system operating parameters are applied when performing heat load estimations
8. Parameters, specifications and performance requirements in relation to commercial refrigeration and/or air conditioning system are set in accordance with workplace procedures
9. Appropriate approaches to determine the heat loads are carried out to provide most effective solutions
10. Unplanned events are dealt with safely and effectively consistent with regulatory requirements and workplace procedures in a manner that minimises risk to personnel and equipment
11. Work quality is monitored in accordance with performance agreement and/or workplace or industry standards
12. Complete and report heat loads for commercial refrigeration and /or air conditioning applications
    • Heat load estimations are documented, including details of findings, calculations and assumptions, in accordance with workplace procedures
13. Completed heat loads are submitted to appropriate person/s to be checked for accuracy and compliance with project specifications and evaluated to determine whether performance requirements are met
14. Heat load estimations are reported to relevant person/s to determine appropriate action to be taken based on findings

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.
Determining heat loads for commercial refrigeration and/or air conditioning applications must include at least the following:	one quick selection short-form paper and/or one computer-based method for a refrigeration and/or air conditioning system

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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:

establishing system parameters for heat load selecting appropriate head load calculation tools identifying heat loads accurately using calculation methods accurately documenting heat loads correctly dealing with unplanned events applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures and practices requirements, including using risk control measures applying sustainable energy principles and practices determining heat loads for commercial refrigeration and air conditioning applications planning to determine heat loads for commercial refrigeration/air conditioning applications.

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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 heat load estimating commercial refrigeration applications, safe working practices and relevant standards, codes and regulations, including: heat transfer: factors affecting heat transfer insulation material characteristics vapour barriers (seals) ambient conditions composite walls (heat flows) types of common insulation thermal conductivity film factors cabinet construction and design: deep freeze case meat case dairy case fruit and vegetable case drink cabinets air change load: room volumes room usage (average, medium and heavy) heat removed from cooling air to refrigerated conditions air curtains temperature differences door opening sizes Tamm’s equation product load: sensible heat latent heat heat of respiration storage temperatures unit running times humidity air flows stacking of products freeze, chill and thaw times total freezer/cool room loads: wall load air change load product load miscellaneous total load, safety factor and unit running times floor loads in cool rooms door opening loads (ASHRAE and RADS methods) door opening loads (for trucks) process cooling loads cooling chemical reactions energy balance methods sensible and latent cooling of gases sensible and latent cooling of water vapour in gas streams computer programs commercial air conditioning heat load estimating heat load estimating for commercial air conditioning applications, safe working practices and relevant standards, codes and regulations, including: heat flow in buildings: conduction convection radiation heat paths thermal storage different methods of calculations: ASHRAE carrier finite difference U values film coefficients solar heat: direct diffuse sol air temperature sun position calculations design conditions: outdoor monthly/daily corrections comfort/critical indoor effective temperature thermal comfort space characteristics equipment location zoning internal loads: lighting equipment people load profiles internal partitions fresh air/AS 1668 The use of ventilation and air conditioning in buildings calculation of fabric loads: walls roofs floors windows: glass types and factors shade factors internal and external shading shading from adjacent structures air quantity calculation: psychrometrics by-pass factor coil load variable air volume (VAV) air quantities piping and other losses refrigeration plant load computer software: responsible use relevant commercial refrigeration and air conditioning manufacturer specifications relevant job safety assessments or risk mitigation processes relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures.

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