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Evidence Guide: UEERA0015 - Design carbon dioxide refrigerated 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

 

UEERA0015 - Design carbon dioxide refrigerated systems

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

Prepare to design CO² refrigeration systems

  1. WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied
WHS/OHS requirements and workplace procedures for a given work area are identified, obtained and applied

Completed
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Scope of the refrigeration system is determined from design specifications and/or consultations with relevant person/s

Completed
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Safety and system are identified, obtained and applied in accordance with relevant industry standards

Completed
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Work supervisor and/or customer/s are consulted to determine functions and parameters of the system required in accordance with design specifications and workplace documentation

Completed
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Design development work is planned in accordance with workplace procedures for timelines in consultation with others involved

Completed
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Design CO² refrigeration systems

  1. WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
WHS/OHS risk control measures and workplace procedures for carrying out the work are followed

Completed
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Relevant CO² refrigeration system analysis, components and piping are applied to developing the system design in accordance with workplace procedures and relevant industry standards

Completed
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Safety, functionality and budgetary considerations are incorporated in the installation specifications

Completed
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Equipment required is selected in accordance with the design specifications and workplace procedures

Completed
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Location of components is documented in accordance workplace procedures and operation of system functions

Completed
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System design draft is checked for compliance in accordance with the design brief and relevant industry standards

Completed
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System design is documented for submission to relevant person/s for approval

Completed
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Unplanned events are dealt with in accordance with problem-solving techniques and workplace procedures

Completed
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Obtain approval for design

  1. System design is presented to customer and/or relevant person/s in accordance with workplace procedures
System design is presented to customer and/or relevant person/s in accordance with workplace procedures

Completed
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Requests for alterations to the design are negotiated with relevant person/s in accordance with workplace procedures

Completed
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Final design is documented and approval obtained from relevant person/s in accordance with workplace procedures

Completed
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Quality of work is monitored in accordance with workplace procedures and relevant industry standards

Completed
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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:

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.

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.

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