This unit involves the skills and knowledge required to analyse the psychrometric performance of heating, ventilation and air conditioning/refrigeration (HVAC/R) systems.

It includes analysing HVAC/R system to provide solutions to psychrometric performance issues. It also includes working safely, gathering and analysing psychrometric performance data, applying problem-solving techniques, and developing and documenting results and solutions.

No licensing, legislative or certification requirements apply to this unit at the time of publication.

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Prepare to analyse psychrometric performance of HVAC/R system

1.1

Work health and safety (WHS)/occupational health and safety (OHS) processes and workplace procedures for a given work area are identified and applied

1.2

WHS/OHS risk control measures and workplace procedures are followed in preparation for HVAC/R work

1.3

Extent of the psychrometric issues are determined from performance specifications and situation reports and in consultation with relevant person/s

1.4

HVAC/R activities are planned to meet scheduled timelines in consultation with other person/s involved in the work

1.5

Strategies are formed to ensure HVAC/R analysis and solution implementation is carried out efficiently in accordance with workplace procedures

2

Analyse psychrometric performance of HVAC/R system

2.1

WHS/OHS risk control measures and workplace procedures for carrying out HVAC/R work are followed

2.2

Psychrometric principles are applied to analytical solutions to HVAC/R system

2.3

Parameters, specifications and performance requirements in relation to HVAC/R system are obtained in accordance with workplace procedures

2.4

Analysis of HVAC/R psychrometric parameters is carried out to provide effective solutions

2.5

Unplanned situations are responded to in accordance with regulatory requirements and workplace procedures in a manner that minimises risk to personnel and equipment

2.6

Quality of work is monitored against performance agreement and/or workplace procedures and industry standards

3

Document and report results of the HVAC/R psychrometric performance analysis and actions taken

3.1

Solution/s to HVAC/R psychrometric issues are evaluated to determine their effectiveness and modified, as required

3.2

HVAC/R analysis is documented and includes details of findings, calculations and assumptions

3.3

HVAC/R analysis is reported to appropriate person/s to determine appropriate action to be taken based on findings

3.4

Justification for findings and any actions to be undertaken in relation to the HVAC/R equipment is documented for inclusion in work/project or development records in accordance with industry standards and workplace procedures

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 the psychrometric performance issues

forming effective strategies for analysing refrigeration and air conditioning systems performance

obtaining psychrometric performance parameters, specifications and performance requirements appropriate to each situation

evaluating the results of the analysis

documenting analysis details of all findings, calculations and assumptions

documenting justification of actions to be implemented in accordance with professional standards

dealing with unplanned events

applying problem-solving techniques

applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures and practices, including using risk control measures

applying sustainable energy principles and practices.

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:

heating, ventilation and air conditioning/refrigeration (HVAC/R) psychometrics, safe working practices and relevant standards, codes and regulations, including:

fundamentals and terms:

sensible heat factor (conditioned space and grand total)

quantity of air

effective surface temperature

bypass factor

coil characteristics:

processes

sensible cooling

cooling and dehumidification

sensible heating

spray processes:

saturation efficiency

processes

adiabatic/evaporative cooling

cooling and humidification

sensible cooling

chemical dehumidification process: dehumidification and heating

cooling tower characteristics: humidification and cooling

indirect evaporative cooling process

system analysis:

partial load

reheat control

bypass control

volume control

dump back systems

low velocity coils

psychrometric 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

air mixing equations

air quantity equations

problem-solving techniques

psychrometric physical and thermodynamic properties of gas-vapor mixtures, including psychrometric principles

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace documentation

typical psychrometric performance issues.

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 workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated 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 other simulations

relevant and appropriate materials, tools, equipment and personal protective equipment (PPE) currently used in industry

applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals.

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

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.

analysing psychrometric parameters of HVAC/R systems must include at least the following:

two different refrigeration and air conditioning systems

Electrotechnology

Refrigeration and air-conditioning