Assessor Resource

UEERA0015
Design carbon dioxide refrigerated systems

Assessment tool

Version 1.0
Issue Date: May 2024


This unit involves the skills and knowledge required to design carbon dioxide (CO²) refrigerated systems.

It includes applying refrigeration systems, safety and relevant industry standards; developing alternative design schemes based on a design brief and customer requirements; and documenting system design.

The skills and knowledge described in this unit may, in some jurisdictions, require a licence or permit to practice in the workplace subject to regulations for undertaking refrigeration and air conditioning work. Practice in the workplace and during training is also subject to work health and safety (WHS)/occupational health and safety (OHS) regulations.

No other licensing, legislative or certification requirements apply to this unit at the time of publication.

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


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.

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:

understanding required operating functions and parameters from the design specification

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

documenting and presenting design effectively

negotiating design alteration requests successfully

obtaining approval for final design

dealing with unplanned events

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including using risk control measures

designing carbon dioxide (CO²) refrigeration systems

preparing to design CO² refrigeration systems.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, and performance criteria and range of conditions and include knowledge of:

CO² refrigeration system design requirements, components and piping design requirements, safe working practices and relevant standards, codes and regulations, including:

technical standards, regulations and codes for carbon dioxide refrigeration systems:

standard philosophy and format

standards, regulations and codes that apply to CO2 refrigeration systems

equipment manufacturer's specifications

CO² refrigeration system design requirements:

possible areas of applications of CO2 refrigeration systems:

mobile air conditioner

heat pump water heater

commercial refrigeration

thermodynamic properties of CO2:

CO2 phase diagram

CO2 properties tables and chart

conventional refrigeration cycle versus CO2 refrigeration cycle:

T-s and pH diagram representations

isentropic efficiency

volumetric efficiency

types of CO2 refrigeration system configurations:

sub-critical operation

trans-critical operation

cascade systems

performance analysis of CO2 refrigeration systems

sub-critical cycle

trans-critical cycle

cascade systems

CO² refrigeration system components and piping:

design preliminaries:

system operating parameters

project specifications

equipment selection criteria

selection tables, charts and catalogues

heat exchanger selection:

selection of evaporators

selection of condensers

selection of coolers

compressor selection

liquid expansion devices selection

system load balance point

refrigeration line design and sizing

automatic controls

safety devices

problem-solving techniques

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace budget, quality, policies and procedures

relevant workplace documentation.

Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must occur in suitable workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated suitable workplace operational situations that replicate workplace conditions.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Resources for assessment must include access to:

a range of relevant exercises, case studies and/or simulations

relevant and appropriate materials, tools, facilities and equipment currently used in industry

applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals.

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.

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.

Designing CO² refrigeration systems must include at least the following:

two of the following:

two sub-critical or

two trans-critical or

one sub-critical and one trans-critical

major components:

cooler

condenser

compressor

evaporator

associated components and controls

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:

understanding required operating functions and parameters from the design specification

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

documenting and presenting design effectively

negotiating design alteration requests successfully

obtaining approval for final design

dealing with unplanned events

applying relevant work health and safety (WHS)/occupational health and safety (WHS/OHS) requirements, including using risk control measures

designing carbon dioxide (CO²) refrigeration systems

preparing to design CO² refrigeration systems.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, and performance criteria and range of conditions and include knowledge of:

CO² refrigeration system design requirements, components and piping design requirements, safe working practices and relevant standards, codes and regulations, including:

technical standards, regulations and codes for carbon dioxide refrigeration systems:

standard philosophy and format

standards, regulations and codes that apply to CO2 refrigeration systems

equipment manufacturer's specifications

CO² refrigeration system design requirements:

possible areas of applications of CO2 refrigeration systems:

mobile air conditioner

heat pump water heater

commercial refrigeration

thermodynamic properties of CO2:

CO2 phase diagram

CO2 properties tables and chart

conventional refrigeration cycle versus CO2 refrigeration cycle:

T-s and pH diagram representations

isentropic efficiency

volumetric efficiency

types of CO2 refrigeration system configurations:

sub-critical operation

trans-critical operation

cascade systems

performance analysis of CO2 refrigeration systems

sub-critical cycle

trans-critical cycle

cascade systems

CO² refrigeration system components and piping:

design preliminaries:

system operating parameters

project specifications

equipment selection criteria

selection tables, charts and catalogues

heat exchanger selection:

selection of evaporators

selection of condensers

selection of coolers

compressor selection

liquid expansion devices selection

system load balance point

refrigeration line design and sizing

automatic controls

safety devices

problem-solving techniques

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace budget, quality, policies and procedures

relevant workplace documentation.

Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must occur in suitable workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated suitable workplace operational situations that replicate workplace conditions.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Resources for assessment must include access to:

a range of relevant exercises, case studies and/or simulations

relevant and appropriate materials, tools, facilities and equipment currently used in industry

applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals.

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
WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied 
 
 
 
 
WHS/OHS risk control measures and workplace procedures for carrying out the work are followed 
 
 
 
 
 
 
 
System design is presented to customer and/or relevant person/s in accordance with workplace procedures 
 
 
 

Forms

Assessment Cover Sheet

UEERA0015 - Design carbon dioxide refrigerated systems
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

Feedback to student

 

 

 

 

 

 

 

 

Assessor name:

Signature:

Date:

Assessment Record Sheet

UEERA0015 - Design carbon dioxide refrigerated systems

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

Date: