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 the basic operating conditions of vapour compression systems

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

KSEJA Basic operating conditions of vapour compression systems

Evidence shall show an understanding of basic operating conditions of vapour compression systems applying safe working practices and relevant Standards Codes and Regulations to an extent indicated by the following aspects

T Refrigeration Industry

The history of the refrigeration industry note that AC is covered in another unit

Applications classifications and equipment used in the refrigeration industry

T Introduction to the Vapour Compression System

Basic Operation

Major Components

T Heat

Matter atoms molecules energy and its different forms

Heat energy definition unit of measurement

Enthalpy definition unit of measurement

Heat flow hot to cold

Heat transfer

methods conduction convection radiation

requirements

effects

T Temperature and relative humidity

Temperature

Scale types imperial metric absolute and their units of measurement

Conversion tofrom absolute values

Temperature differencechange td t unit of measurement

Relative humidity

Thermometer types and applications digital stem dial maxmin noncontact data loggers

Relative Humidity measurement devices and applications dry bulbwet bulb sling digital

Hazards and related safe working practices working near rotating machinery fans pulleys belts etc

Care and maintenance bending stems overheating removing batteries after use uncoiling capillary

Calibration boiling water iced water send to a specialist etc

Appropriate and safe methods of use

Typical locations on a system

Fitting temperature and relative humidity instruments

T Sensible and Latent Heat

Definition of specific heat capacity latent heat and sensible heat including units of measurement

Types of latent heat

Heat calculations

T Pressure

Define

Scale types imperial metric absolute and their units of measurement

Vacuum scales Pascals microns

Conversion tofrom absolute values

The basic Gas Laws Boyles Charles and Daltons excl combined or general gas law

Pressure gauge types and applications pressure compound vacuum manometer magnehelic barometer

Hazards and related safe working practices dangerous system pressures

Care and maintenance ingress of oil and contaminants dirt avoiding needle bounce esp HP etc

Calibration atmospheric pressure send to a specialist etc

Appropriate and safe methods of use

Typical locations

T Refrigerant conditions

Saturation temperature

Saturated liquid saturated vapour

Superheated vapour

Subcooled liquid

Pressure temperature relationships

PT charts

Enthalpy

T The vapour compression cycle

Primary system components

High and low pressure sides

Basic system operation

T Working safely with refrigeration vapour compression systems

Risk management principles and processes

Hazards and risk control measures associated with

refrigeration vapour compression systems and components

refrigerants

measuring and testing equipment

T Leak detectors

Detector types and applications electronic halide bubble ultra violet

Hazards and related safe working practices working around rotating machinery open flame ultra violet light etc

Care and maintenance delicate electronic equipment changing sensor tip filters changing gas cartridges etc

Calibration auto calibrating send to a specialist etc

Leak detection procedures

T Service gauges

Service Gauges

Types dial gauges or electronic manifolds with additional vacuum and charging ports amp sight glasses

Typical uses for service gauges high amp low side pressure readings charging evacuating

Care and maintenance oil and contaminants dirt in hoses avoiding needle bounce changing hose seals

Calibration hoses open to atmosphere adjusting screw etc

Hose shutoff valves and adaptors access control valves kwik couplers Hansen lines etc

System Access Fittings

Types Schrader piercing service valve post valve quick couplers etc

Typical applications for each

Hazards and related safe working practices oil or liquid spray keeping clean leaks etc

Care and maintenance gland nuts loosenedtightened seal caps fitted regulations on piercing valves

Using Service Gauges

Service gauge manifold hose fitting

Purging

Pressure readings

Service gauge manifold hose removal

Pressure to temperature conversion

T Refrigeration Compressors

Function of the compressor

Compressor styles open drive semihermetic hermetic

Types construction and their applications reciprocating rotary centrifugal screw scroll

Basic types of compressor oil Mineral Polyolester POE Alkyl Benzene Polyalkylene Glycols PAG brief overview covered in more detail in J

Methods of lubrication splash forced

Safe handling MSDS POEs PAGs Mineral ABs Residual acids in used oil

T Condensers and related components

Function of the condenser

Types construction and their applications static forced draught water cooled

Function of a cooling tower

Types construction and their applications natural induced forced evaporative

Function of water pumps

Basic Types and their applications

Function of liquid receivers

Types construction and their applications horizontal vertical combined condenserreceivers

T Evaporators and related components

Function of the evaporator

Evaporator styles direct expansion flooded

Types construction and their applications static forced draught water cooling

Refrigerantairwater flow paths forcedinduced draft parallelcounter flow

Need for water treatment in water systems

Methods used to provide water treatment brief overview

Regulations governing water treatment brief overview

Secondary refrigerants brief overview

Properties amp applications of secondary refrigerants water sodiumcalcium chloride ethylenepropylene glycol

Hazards associated with their use MSDS

T Common Refrigerant Metering Devices

Function of a refrigerant metering device

Overview of common types and their applications capillary tube and TX Valve

T Basic Operating Conditions

Ambient conditions

Common climate values highest max temp lowest min temp mean daily temp mean highestlowest

Typical climates for various common localities

Evaporator Td

Effect of changes in Evap Td and typical industry reference values for water cooled forced draught and static coils

Condenser Td

Effect of changes in Cond Td and typical industry reference values for water cooled forced draught and static coils

Typical storage conditions temp amp RH for common products dairy produce meat and frozen food rooms

Typical high and low side system operating values pressures and temperatures allowing K equivalent PD

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 the basic operating conditions of vapour compression systems as described in and including

A

Selecting and using appropriate measuring devices correctly

B

Recording measurements

C

Using calculation methods accurately

D

Identifying the conditions of a refrigerant at various locations in the vapour compression system

E

Documenting operating conditions 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

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 the basic operating conditions of vapour compression 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

Concurrent assessment and relationship with other units

There are no concurrent assessment recommendations for this unit