Assessor Resource

UEENEEJ132A
Design commercial refrigeration systems and select components

Assessment tool

Version 1.0
Issue Date: May 2024


4)

This unit is intended as an additional competency to relevant competencies previously acquired. It is suitable for employment-based programs under an approved contract of training or institutional based delivery at the aligned AQF 5 level.

1)

1.1)

This unit covers the design of commercial refrigeration systems. It encompasses applying knowledge of refrigeration and food storage technology, refrigeration system components and piping, safety and regulatory requirements, following design specifications and customer requirements and documenting system designs.

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)

Prerequisites

Prerequisite Unit(s)

2)

2.1) Competencies

Granting competency in this unit shall be made only after competency in the following unit(s) has/have been confirmed.

UEENEEJ129A Establish heat loads for commercial refrigeration and/or air conditioning applications

UEENEEJ165A : Evaluate thermodynamic and fluid parameters of refrigeration systems

UEENEEJ127A Establish the thermodynamic parameters of refrigeration and air conditioning systems

UEENEEJ164A Analyse the operation of HVAC air and hydronic systems

UEENEEJ192A Analyse the psychrometric performance of HVAC/R systems

and

UEENEEJ193A Analyse the thermodynamic performance of HVAC/R systems

or

UEENEEJ109A Verify functionality and compliance of refrigeration and air conditioning installations

UEENEEE101A Apply Occupational Health and Safety regulations, codes and practices in the workplace

UEENEEE102A Fabricate, assemble and dismantle utilities industry components

UEENEEE003B Solve problems in extra-low voltage single path circuits

UEENEEE105A Fix and secure electrotechnology equipment

UEENEEE107A Use drawings, diagrams, schedules, standards, codes and specifications

UEENEEE137A Document and apply measures to control OHS risks associated with electrotechnology work

UEENEEJ102A Prepare and connect refrigerant tubing and fittings

UEENEEJ103A Establish the basic operating conditions of vapour compression systems

UEENEEJ104A Establish the basic operating conditions of air conditioning systems

UEENEEJ106A Install refrigerant pipe work, flow controls and accessories

UEENEEJ107A Install air conditioning and refrigeration systems, major components and associated equipment

UEENEEJ108A Recover, pressure test, evacuate, charge and leak test refrigerants

UEENEEJ110A Select refrigerant piping, accessories and associated controls

UEENEEJ111A Diagnose and rectify faults in air conditioning and refrigeration systems and components

UEENEEJ113A Commission air conditioning and refrigeration systems

UEENEEJ153A Find and rectify faults motors and associated controls in refrigeration and air conditioning systems

UEENEEJ170A Diagnose and rectify faults in air conditioning and refrigeration control systems

UEENEEJ194A Solve problems in low voltage refrigeration circuits

UEENEEP012A Disconnect / reconnect composite appliances connected to low voltage installation wiring

UEENEEP017A Locate and rectify faults in low voltage composite appliances using set procedures

UEENEEP024A Attach cords and plugs to electrical equipment for connection to a single phase 230 Volt supply

UEENEEP025A Attach cords, cables and plugs to electrical equipment for connection to 1000 Va.c. or 1500 Vd.c. supply

Employability Skills

3)

This unit contains Employability Skills

The required outcomes described in this unit of competency contain applicable facets of Employability Skills. The Employability Skills Summary of the qualification in which this unit of competency is packaged will assist in identifying Employability Skill requirements.



Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

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:

Design commercial refrigeration systems as described in 8) and including:

A

Understanding required operating functions and parameters from the design specification

B

Developing the design within the safety, regulatory and functional requirements and budget limitations

C

Documenting and presenting design effectively,

D

Successfully negotiating design alteration requests

E

Obtaining approval for final design

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 designing commercial refrigeration 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.

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

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 designing commercial refrigeration systems.

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

KS01-EJ132A Commercial refrigeration system design

Evidence shall show an understanding of commercial refrigeration system design, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects:

T1. Food spoilage and possible causes

physical damage

animal activity

chemical breakdown

enzyme activity

micro-organisms

effects of temperature change

effects of humidity change

effects of freezing on fresh produce

effects of slow freezing time

effect of refreezing

T2. Food preservation

removing or taking out a reactant

removing or inactivating the catalyst

reducing temperature

changing the reaction system

irradiation

T3. Micro-organisms

conditions for growth

potentially hazardous foods

cross contamination

T4. Identification of food spoilage

recognition and suggest possible cause

physical damage

animal activity

chemical breakdown

enzyme activity

micro - organisms

T5. Types of heat processing techniques

heat processing using steam and water

blanching

pasteurisation

sterilisation

evaporation

heat processing using hot air

dehydration

baking and roasting

T6. Types of chilling processing techniques

chilling and controlled atmosphere storage

freezing

freeze drying and freeze concentration

modified atmosphere combined with low temperature cryovac.

T7. Relevant Standards, Codes, Regulations and industry practices

Standards and Codes

Regulations

Equipment manufactures specifications and practices

KS02-EJ132A Refrigeration system components and piping selection

Evidence shall show an understanding of refrigeration system components and piping

selection, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects:

T1. Relevant Standards, Codes Regulations and industry practices

AS1677, detailed understanding

AS 3666, overview

ozone protection regulations

IIAR Ammonia Data Book

ANSI/IIAR standards

ANSI/ASHRAE Mechanical Refrigeration and IIAR

bulletins and standards

Equipment manufactures specifications and practices

T2. Calculation of capacity in heat exchangers

Q = UA (LMTD)

Q = mc∆t

Q = m ∆h

T3. Evaporators

commercial types and applications

coil bypass factor

effects of evaporator TD on space humidity

effects of air circulation on product conditions

selection criteria and selection tables

T4. Condensers

commercial types and applications

effects of ambient conditions

condenser control

heat rejection factor

condenser TD

selection criteria and selection tables

T5. Compressors

types and applications

capacity

displacement

volume flow rate

theoretical capacity

total volumetric efficiency

effect of operating conditions, including suction

pressure drop and superheating

actual capacity

power

theoretical requirement

effects of operating conditions

actual requirements

post defrost loads

pull down torque requirements, high, medium

and low back pressure compressors

selection tables, motor selection

T6. Liquid expansion devices

types, operation and applications

effects from sub-cooling

distributor types, operation and applications

selection tables

System load balance point encompassing:

graphical representation

Line sizing an design

velocity tables

pressure drop in lines and fittings

oil migration stabilisation

refrigerant velocity

effect of varying system capacity

oil traps

risers

double risers

liquid migration

design for parallel components and multiplex systems

T7. Automatic controls

fin spacing, suction temp to evaporator suction

hot-gas bypass valves

electronic control of valves PLC control

refrigerant regulating valves

solenoid valves

condenser pressure regulating valves

evaporator pressure regulating valves

crankcase pressure regulating valves

cycling controls

pressure-stats

thermostats,

defrost controls

monitoring and alarm controls

refrigeration automation systems

control strategies

control modes

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 designing at least two different commercial refrigeration systems encompassing only one of each major component (i.e. condenser, compressor and evaporator) and associated components and controls.

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.

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
OHS processes and procedures for a given work area are identified, obtained and understood 
The extent and nature of the refrigeration system is determined from design specifications. 
Safety and other regulatory requirements to which the system shall comply are identified, obtained and understood 
Work supervisor or customers are consulted to determine which functions of the system are to be use and the parameter of each and written confirmation sought. 
Design development work is planned to meet scheduled timelines in consultation with others involved on the work site. 
Established OHS risk control measures and procedures for carrying out the work are followed. 
Knowledge of refrigeration and food storage technology, refrigeration system components and piping, performance standards and compliance methods are applied to developing the system design 
Safety, functional and budgetary considerations are incorporated in the installation design. 
Equipment required for the system is selected in accordance with the design specifications and established requirements. 
Location of components of the system is documented to ensure correct operation of system functions. 
System design draft is checked for compliance with the design brief and regulatory requirements. 
System design is documented for submission to appropriate person(s) for approval. 
Solutions to unplanned situation are provided consistent with organisation's policy. 
System design is presented and explained to client representative and/or other relevant person(s). 
Requests for alterations to the design are negotiated with relevant person(s) within the constraints of organisation's policy. 
Final design is documented and approval obtained from appropriate person(s). 
Quality of work is monitored against personal performance agreement and/or established organizational or professional standards. 

Forms

Assessment Cover Sheet

UEENEEJ132A - Design commercial refrigeration systems and select components
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Assessment Record Sheet

UEENEEJ132A - Design commercial refrigeration systems and select components

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