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Elements and Performance Criteria

  1. Prepare to determine thermodynamic parameters of refrigeration and air conditioning systems
  2. Determine thermodynamic parameters of refrigeration and air conditioning systems
  3. Document determined thermodynamic parameters

Required Skills

This describes the essential skills and knowledge and their level required for this unit

Evidence shall show that knowledge has been acquired of safe working practices and determining thermodynamic parameters of refrigeration and air conditioning systems

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSEJA Thermodynamic parameters of refrigeration and air conditioning systems

Evidence shall show an understanding of engineering mathematics fundamentals and refrigeration science to an extent indicated by the following aspects

T Arithmetic

Rational and irrational numbers surds

SI units conversion using unity brackets

Laws of indices base scientific and engineering notation

Estimations errors and approximations significant figures

T Algebra

Substitution

x on simple polynomials Simple indices

Expanding brackets

Factorising quadratics Common factors difference of two squares

Simplifying algebraic fractions

Transposition of engineering formulae

Solving one variable equations

Simple algebraic division

T Geometry

Pythagoras Theorem

Angles degrees radians Parallel lines cut by a transverse

Triangles sum of angles properties of equilateral and isosceles triangles

Congruent triangles

Similar triangles ratio of corresponding sides

Sin cos tan ratios of a right angled triangle

Sine and cosine rules

Circles circumference arcs chords tangents circle theorems

Area and perimeter mensuration on above figures

T Coordinate geometry

D plane xy axes st axes

Graph of linear function y ax b Functional notation y fx

Straight line given slope and one point or given two points

Linear equations solving algebraically and geometrically

Solving linear functions simultaneously algebraically and geometrically

Line segment length and mid point

T Engineering mechanics

massdensity

weight

forces

specific gravity

equilibrium

momentum

friction loss

velocity and speed

energy in all forms

mechanical advantage

efficiency

pressurestress

T Molecular theory

changes of state

sublimation

expansion and contraction

electron flow

state of aggregation

internal potential energy

phase change diagrams

T Thermodynamics

temperature scales

conservation of energy

specific heat

sensible latent and super heat

properties of steam

enthalpy

heat energytemperature relationship

heat balance on a body

heat transfer

conductivity

calorimetry

Peltier effect

st and nd law of thermodynamics

T Gas laws and liquids

pressure

Boyles law

Charles law

Volumetric relationship

psychrometrics

latent heat of vaporisation

relative humidity

air conditioning processes

dynamic pressure loss

velocity and static pressure

bourdon tubes

density and relative density

Archimedes principle

Bernoullis Equation

manometers

absorption refrigeration

centrifugal compression

external work of a liquid

pressure volume diagrams

isothermal and adiabatic processes

polytropic processes

Daltons law of partial pressure

T Vapour compression

pressureenthalpy relationship

entropy

characteristics of the evaporation condensation

compression and pressure drop phases

coefficient of performance

theoreticalpractical cycles

characteristics of refrigerants

theoretical power input

pressure losses

heat exchange

effects of condensing condition changes

subcooling and superheating

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria Required Skills and Knowledge the Range Statement and the Assessment Guidelines for this Training Package

The Evidence Guide forms an integral part of this Unit It must be used in conjunction with all parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the industrypreferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment In some circumstances assessment in part or full can occur outside the workplace However it must be in accordance with industry and regulatory policy

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety nature of working with electricity electrical equipment gas or any other hazardous substancematerial carries risk in deeming a person competent Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal everyday work influence decisions about howhow much the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites must be met

Evidence for competence in this unit shall be considered holistically Each Element and associated performance criteria shall be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence shall also comprise

Evidence for competence in this unit shall be considered holistically. Each Element and associated performance criteria shall be demonstrated on at least two occasions in accordance with the 'Assessment Guidelines - UEE07 '. Evidence shall also comprise:

A representative body of work performance demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this shall incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below

Determine thermodynamic parameters of refrigeration and air conditioning systems as described in and including

A

Selecting and using appropriate measuring devices correctly

B

Interpreting measurements

C

Using calculation methods accurately

D

Identifying parameters not within the specified range

E

Documenting thermodynamic parameters correctly

F

Dealing with unplanned events by drawing on essential knowledge and skills to provide appropriate solutions incorporated in the holistic assessment with the above listed items

Note Successful completion of relevant vendor training may be used to contribute to evidence on which competency is deemed In these cases the alignment of outcomes of vendor training with performance criteria and critical aspects of evidence shall be clearly identified

Note:
Successful completion of relevant vendor training may be used to contribute to evidence on which competency is deemed. In these cases the alignment of outcomes of vendor training with performance criteria and critical aspects of evidence shall be clearly identified

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual work as prescribed by this unit

These should be part of the formal learningassessment environment

Note

Where simulation is considered a suitable strategy for assessment conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy

Evidence should show demonstrated competency in determining thermodynamic parameters of refrigeration and air conditioning systems

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note Competent performance with inherent safe working practices is expected in the Industry to which this unit applies This requires assessment in a structured environment which is intended primarily for learningassessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit

Note:
Competent performance with inherent safe working practices is expected in the Industry to which this unit applies. This requires assessment in a structured environment which is intended primarily for learning/assessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit.

Concurrent assessment and relationship with other units

There are no concurrent assessment recommendations for this unit


Range Statement

8) This relates to the unit as a whole providing the range of contexts and conditions to which the performance criteria apply. It allows for different work environments and situations that will affect performance.

This unit must be demonstrated in relation to determining thermodynamic parameters using measurement and calculation methods of a refrigeration or air conditioning system, including temperature, pressure, relative humidity and enthalpy.

Generic terms used throughout this Vocational Standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms that apply are given in Volume 2, Part 2.1.