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Evidence Guide: UEERA0016 - Design commercial refrigeration systems and select components

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!

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UEERA0016 - Design commercial refrigeration systems and select components

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

Prepare to design commercial refrigeration systems

  1. WHS/OHS procedures are identified, obtained and implemented in accordance with workplace procedures
WHS/OHS procedures are identified, obtained and implemented in accordance with workplace procedures

Completed
Date:

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Scope of the refrigeration system is identified from design specifications

Completed
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System safety, regulatory and compliance requirements are identified and applied

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

Completed
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Design development work is planned in consultation with relevant person/s involved to meet scheduled timelines

Completed
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Design commercial refrigeration systems

  1. WHS/OHS risk control measures and procedures are followed in accordance with workplace procedures
WHS/OHS risk control measures and procedures are followed in accordance with workplace procedures

Completed
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Relevant refrigeration, food storage, technology refrigeration system components, piping and performance standards are applied to the system design in accordance with relevant industry standards

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

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

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

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

Completed
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System design is documented and submitted to relevant person/s for approval in accordance with workplace procedures

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 commercial refrigeration systems 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

successfully negotiating design alteration requests

obtaining approval for final design

dealing with unplanned events

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

designing commercial refrigeration systems

preparing to design commercial refrigeration systems.

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:

commercial refrigeration system design, safe working practices and relevant standards, codes and regulations, including:

food spoilage and possible causes:

physical damage

animal activity

chemical breakdown

enzyme activity

microorganisms

effects of temperature change

effects of humidity change

effects of freezing on fresh produce

effects of slow freezing time

effect of refreezing

food preservation:

removing or taking out a reactant

removing or inactivating the catalyst

reducing temperature

changing the reaction system

irradiation

microorganisms:

conditions for growth

potentially hazardous foods

cross-contamination

identification of food spoilage:

recognition and suggest possible cause

physical damage

animal activity

chemical breakdown

enzyme activity

microorganisms

types of heat processing techniques:

heat processing using steam and water

blanching

pasteurisation

sterilisation

evaporation

heat processing using hot air

dehydration

baking and roasting

types of chilling processing techniques:

chilling and controlled atmosphere storage

freezing

freeze drying and freeze concentration

modified atmosphere combined with low temperature cryovac

equipment manufactures specifications and practices

refrigeration system components and piping selection, safe working practices and relevant standards, codes and regulations, including:

relevant industry practices:

AS/NZS 1677 Refrigerating systems SAA refrigeration code

AS/NZS 3666 Air-handling and water systems of buildings

ozone protection regulations

IIAR ammonia data book

ANSI/IIAR standards

ANSI/ASHRAE mechanical refrigeration and IIAR

bulletins and standards

equipment manufacturer’s specifications and practices

calculation of capacity in heat exchangers:

Q = UA (LMTD)

Q = mc∆t

Q = m ∆h

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

condensers:

commercial types and applications

effects of ambient conditions

condenser control

heat rejection factor

condenser TD

selection criteria and selection tables

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 and medium

and low back pressure compressors

selection tables, motor selection

liquid expansion devices:

types, operation and applications

effects from sub-cooling

distributor types, operation and applications

selection tables

system load balance point

graphical representation

line sizing and 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

automatic controls:

fin spacing, suction temp to evaporator suction

hot-gas bypass valves

electronic control of valves and programmable logic controllers (PLC)

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

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 commercial refrigeration systems must include at least the following:

two different commercial refrigeration systems with one of the following:

condenser

compressor

evaporator

associated components and controls