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Evidence Guide: UEENEEJ127A - Establish the thermodynamic parameters of refrigeration and air conditioning systems

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

UEENEEJ127A - Establish the thermodynamic parameters of refrigeration and air conditioning systems

What evidence can you provide to prove your understanding of each of the following citeria?

Prepare to determine thermodynamic parameters of refrigeration and air conditioning systems

  1. OHS procedures for a given work area are identified, identified, obtained and understood
  2. Established OHS risk control measures and procedures are followed in preparation for the work.
  3. The expected operating conditions are obtained from documentation or from work supervisor to establish the scope of work to be undertaken.
  4. Advice is sought from the work supervisor to ensure the work is coordinated effectively with others.
  5. Tools, equipment and testing devices needed to determine the basic operating conditions are obtained and checked for correct operation and safety
OHS procedures for a given work area are identified, identified, obtained and understood

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Established OHS risk control measures and procedures are followed in preparation for the work.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

The expected operating conditions are obtained from documentation or from work supervisor to establish the scope of work to be undertaken.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Advice is sought from the work supervisor to ensure the work is coordinated effectively with others.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Tools, equipment and testing devices needed to determine the basic operating conditions are obtained and checked for correct operation and safety

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

The expected operating conditions are obtained from documentation or from work supervisor to establish the scope of work to be undertaken.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine thermodynamic parameters of refrigeration and air conditioning systems

  1. Established OHS risk control measures and procedures for carrying out the work are followed.
  2. Measurement of thermodynamic system operating parameters is conducted in strict accordance with OHS requirements and established safety procedures
  3. System is checked and isolated where necessary, in strict accordance OHS requirements and procedures
  4. Established procedures are used to determine actual and specified range of thermodynamic parameters from measured and calculated values as they apply to particular refrigeration or air conditioning systems.
  5. Established methods for dealing with unexpected situations are discussed with appropriate person or persons and documented.
  6. Unexpected situations are dealt with safely and with the approval of an authorised person.
  7. Thermodynamic parameters are determined without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices.
Established OHS risk control measures and procedures for carrying out the work are followed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Measurement of thermodynamic system operating parameters is conducted in strict accordance with OHS requirements and established safety procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

System is checked and isolated where necessary, in strict accordance OHS requirements and procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Established procedures are used to determine actual and specified range of thermodynamic parameters from measured and calculated values as they apply to particular refrigeration or air conditioning systems.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Established methods for dealing with unexpected situations are discussed with appropriate person or persons and documented.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Unexpected situations are dealt with safely and with the approval of an authorised person.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Thermodynamic parameters are determined without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Document determined thermodynamic parameters

  1. OHS work completion risk control measures and procedures are followed.
  2. Work site and equipment is cleaned and made safe in accordance with established procedures.
  3. Thermodynamic parameters are documented including identification of any parameter that is not within the specified range for the system.
  4. Work supervisor is notified of the completion of the work in accordance with established procedures.
OHS work completion risk control measures and procedures are followed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Work site and equipment is cleaned and made safe in accordance with established procedures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Thermodynamic parameters are documented including identification of any parameter that is not within the specified range for the system.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Work supervisor is notified of the completion of the work in accordance with established procedures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

9) 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

9.1)

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 industry-preferred 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 substance/material 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 how/how 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

9.2)

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 - 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 8) 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

Context of and specific resources for assessment

9.3)

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 learning/assessment 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

9.4)

This unit shall be assessed by methods given in Volume 1, Part 3 '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 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

9.5)

There are no concurrent assessment recommendations for this unit.

Required Skills and Knowledge

7) 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.

KS01-EJ127A 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:

T1 Arithmetic

Rational and irrational numbers, surds

SI units, conversion using unity brackets

Laws of indices (base 10), scientific and engineering notation

Estimations, errors and approximations, significant figures

T2 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.

T3 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.

T4 Coordinate geometry

2D plane; x-y axes, s-t axes

Graph of linear function, y = ax + b. Functional notation, y = f(x)

Straight line given slope and one point or given two points

Linear equations: solving algebraically and geometrically

Solving 2 linear functions simultaneously, algebraically and geometrically

Line segment: length and mid point.

T5 Engineering mechanics

mass/density

weight

forces

specific gravity

equilibrium

momentum

friction loss

velocity and speed

energy in all forms

mechanical advantage

efficiency

pressure/stress

T6 Molecular theory

changes of state

sublimation

expansion and contraction

electron flow

state of aggregation

internal potential energy

phase change diagrams

T7 Thermodynamics

temperature scales

conservation of energy

specific heat

sensible, latent and super heat

properties of steam

enthalpy

heat energy/temperature relationship

heat balance on a body

heat transfer

conductivity

calorimetry

Peltier effect

1st and 2nd law of thermodynamics

T8 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

Bernoulli’s Equation

manometers

absorption refrigeration

centrifugal compression

external work of a liquid

pressure volume diagrams

isothermal and adiabatic processes

polytropic processes

Dalton’s law of partial pressure

T9 Vapour compression

pressure/enthalpy relationship

entropy

characteristics of the evaporation, condensation,

compression and pressure drop phases

co-efficient of performance

theoretical/practical cycles

characteristics of refrigerants

theoretical power input

pressure losses

heat exchange

effects of condensing condition changes

sub-cooling and super-heating

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.