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Evidence Guide: UEERA0038 - 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

 

UEERA0038 - 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 system

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

WHS/OHS risk control measures and workplace procedures are followed in preparation for refrigeration and air conditioning system work

Completed
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Refrigeration and air conditioning system operating conditions are obtained from documentation or work supervisor to determine the scope of work to be undertaken

Completed
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Advice is sought from the work supervisor to ensure refrigeration and air conditioning system work is coordinated effectively with others

Completed
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Tools, equipment and testing devices needed to determine the refrigeration and air conditioning system operating conditions are obtained and checked for correct operation and safety

Completed
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Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine thermodynamic parameters of refrigeration and air conditioning system

  1. WHS/OHS risk control measures and workplace procedures for carrying out refrigeration and air conditioning system work are followed
WHS/OHS risk control measures and workplace procedures for carrying out refrigeration and air conditioning system work are followed

Completed
Date:

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Measurement of thermodynamic system operating parameters is conducted in accordance with WHS/OHS requirements and workplace safety procedures

Completed
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System is checked and isolated in accordance with WHS/OHS requirements and workplace procedures

Completed
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Actual and specified range of thermodynamic parameters are determined from measured and calculated values as they apply to refrigeration or air conditioning system in accordance to workplace procedures

Completed
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Unexpected situations are discussed with appropriate person/s, responded to in accordance with workplace procedures and documented in a manner that minimises risk to personnel and equipment

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

Completed
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Document thermodynamic parameters

  1. WHS/OHS work completion risk control measures and workplace procedures are followed
WHS/OHS work completion risk control measures and workplace procedures are followed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Worksite and equipment are cleaned and made safe in accordance with workplace procedures

Completed
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Thermodynamic parameters are documented, including identification of any parameter that is not within the specified range for the refrigeration and air conditioning system

Completed
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Work supervisor is notified of work completion in accordance with workplace procedures

Completed
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Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

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:

selecting and using appropriate measuring devices correctly

interpreting measurements

using calculation methods accurately

identifying parameters not within the specified range

documenting thermodynamic parameters correctly

dealing with unplanned events

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

applying sustainable energy principles and practices

planning to determine thermodynamic parameters of refrigeration and air conditioning system.

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:

thermodynamic parameters of refrigeration and air conditioning systems, engineering mathematics fundamentals and refrigeration science, including:

arithmetic:

rational and irrational numbers, surds

International System of Units (SI) units and conversion using unity brackets

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

estimations, errors and approximations, and significant figures

algebra:

substitution

+, -, x on simple polynomials and simple indices

expanding brackets

factorising quadratics, common factors and difference of two squares

simplifying algebraic fractions

transposition of engineering formulae

solving one variable equations

simple algebraic division

geometry:

Pythagoras Theorem

angles: degrees, radians and parallel lines cut by a transverse

triangles: sum of angles, and 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 and circle theorems

area and perimeter mensuration on above figures

coordinate geometry:

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

graph of linear function, y = ax + b and functional notation, y = f(x)

straight line given slope and one point or given two points

linear equations: solving algebraically and geometrically

solving two linear functions simultaneously, algebraically and geometrically

line segment: length and mid-point

engineering mechanics:

mass/density

weight

forces

specific gravity

equilibrium

momentum

friction loss

velocity and speed

energy in all forms

mechanical advantage

efficiency

pressure/stress

molecular theory:

changes of state

sublimation

expansion and contraction

electron flow

state of aggregation

internal potential energy

phase change diagrams

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

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

vapour compression:

pressure/enthalpy relationship

entropy

characteristics of evaporation and 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 superheating

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace documentation

relevant workplace policies and procedures.

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 thermodynamic parameters of refrigeration and air conditioning systems must include at least the following:

using measurement and calculation methods of a refrigeration or air conditioning system, including:

temperature

pressure

relative humidity

enthalpy