Required skills

Required skills include

determining HVACR system parameters from plans specifications and site inspections

reviewing features and functions of HVACR system components

investigating sustainability implications of HVACR systems

identifying relevant thermodynamic principles and techniques

testing and measuring system and component performance parameters

evaluating system thermal loads and relationship to and implications for component sizes and system performance

selecting and using appropriate calculations techniques and software for analysis and simulations

validating software and software techniques required for thermal load evaluations

reporting and documenting processes results and recommendations

Required knowledge

Required knowledge includes

WHS and regulatory requirements codes of practice standards risk management and registration requirements

sources of professional and technical assistance

current options and trends in performance analysis software including underpinning program techniques

thermal load measuring equipment and test apparatus

sustainability implications of HVAC systems including consideration of energy sources and energy efficiency

thermodynamic principles required by thermal loading analysis and HVACR management systems

thermodynamic concepts related to HVACR

properties process and state

mass conservation of mass specific volume and density specific volume relative density force weight pressure temperature Zeroth law absolute scales and International System of Units SI units

systems cycles and steady state

energy forms

effects of heating of solids and liquids

heat transfer conduction convection and radiation

property tables for conductivity convection and radiation coefficients

Fourier law of conduction and conductivity of materials

convection

mechanism of convection

convection heat transfer coefficient and factors affecting the coefficient

fluid flow characteristics geometry of convection surfaces natural and forced convection and flow regime

units kinematic viscosity and dynamic viscosity

convective heat transfer coefficients for conduit and annular flow hydraulic diameter

heat exchangers types efficiency and measurements

radiators

emission absorption and reflection properties and measurements

Wiens displacement law

Kirchhoffs law

solar energy heating and power generation

radiant energy on surfaces

variations such as Azimuth and zenith angles path length cloud cover and water vapour and shade factors for windows

combined heat transfer

conduction plus convection heat exchangers using air and water as transfer mediums

conduction convection and radiation qualitative

cooling fins

heat flow electrical analogy graphical solution techniques and qualitative understanding of numerical methods

vapour compression refrigeration

vapourcompression cycle for refrigeration

system components including throttling valves and capillary tubes as throttling devices

performance criteria for refrigeration system evaluation

types of refrigerant

refrigerant properties and ph diagrams

ideal vapour compression cycle on the ph diagram

energy balance and heat transfers in compressor evaporator and condenser

variation of actual cycles from the ideal

vapourcompression cycle with suction superheating liquid subcooling and pressure drop in system components

mechanical components of vapour compression refrigeration and HVAC systems

refrigeration enclosures cabinets cold rooms and freezer rooms

factors affecting refrigeration heat transfer

building thermal performance survey procedures

standard thermal values in relation to a commercialindustrial building

equipment size for constant and variable volume systems and central refrigeration and boiler capacities

thermal properties of buildings and building materials

people loads

cost implications of air conditioning and heating designs

heat loads

thermal lag

occupant comfort and safety factors

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package

Overview of assessment

A person who demonstrates competency in this unit must be able to evaluate the thermal loads for a commercial refrigeration system and for a multiple zone commercial or industrial building

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Assessors must be satisfied that the candidate can competently and consistently

determine HVACR system parameters

investigate sustainability implications of HVACR systems

identify relevant thermodynamic principles and techniques for particular HVACR system thermal load evaluations

review features and functions of HVACR systems and components

test and measure HVACR systems and component performance parameters

evaluate system and component performance with tabulated and software generated data

apply and validate software for analysis and simulation

report and document results

Context of and specific resources for assessment

This unit may be assessed on the job off the job or a combination of both on and off the job Where assessment occurs off the job then a simulated working environment must be used where the range of conditions reflects realistic workplace situations

The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team

Where applicable reasonable adjustment must be made to work environments and training situations to accommodate ethnicity age gender demographics and disability

Access must be provided to appropriate learning andor assessment support when required Where applicable physical resources should include equipment modified for people with disabilities

Method of assessment

Assessment must satisfy the endorsed Assessment Guidelines of the MEM Metal and Engineering Training Package

Assessment must satisfy the endorsed Assessment Guidelines of the MEM05 Metal and Engineering Training Package.

Assessment methods must confirm consistency and accuracy of performance over time and in a range of workplace relevant contexts together with application of underpinning knowledge

Assessment methods must be by direct observation of tasks and include questioning on underpinning knowledge to ensure correct interpretation and application

Assessment may be applied under projectrelated conditions real or simulated and require evidence of process

Assessment must confirm a reasonable inference that competency is not only able to be satisfied under the particular circumstance but is able to be transferred to other circumstances

Assessment may be in conjunction with assessment of other units of competency where required

Guidance information for assessment

Assessment processes and techniques must be culturally appropriate and appropriate to the language and literacy capacity of the candidate and the work being performed

Sustainability

Appropriate technical and professional assistance

Standards and codes

Commercial refrigeration cabinets

Miscellaneous heat

Relevant documentation