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Evidence Guide: UEERA0022 - Design heating, ventilation and air conditioning (HVAC) 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!

From the Wiki University

 

UEERA0022 - Design heating, ventilation and air conditioning (HVAC) systems and select components

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

Prepare to design HVAC 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
Date:

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

Completed
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Safety and systems 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

  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
Date:

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Relevant refrigeration and food storage technology, refrigeration system 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 design

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 are 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 the design brief and relevant industry standards

Completed
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System design is documented and submitted 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 HVAC design

  1. System design is presented and explained to customer and/or relevant person/s
System design is presented and explained to customer and/or relevant person/s

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

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 (WHS/OHS) requirements, including using risk control measures

designing heating, ventilation and air conditioning (HVAC) systems

preparing to design HVAC 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 HVAC system design, safe working practices and relevant standards, codes and regulations, including:

design parameters for single-storey buildings (e.g. offices, restaurants, hotels and bars):

customer and objective

customer concept of environment desired

economics

client brief

relevant design criteria:

building purpose, location, orientation and shape

external environment ambient conditions

internal load diversity

thermal capacity behaviour

thermal load (full and partial)

zoning and building usage:

space and building

occupancies, single purpose and multi-purpose

system selection criteria:

economics

environment

control requirements

existing structures

new structures

system components

space for equipment and system

selection of appropriate system, equipment, ductwork and components

systems and applications:

design features, engineering and selection procedures for direct expansion air conditioning systems:

air conditioning split systems and package units

free blow and ducted fan coil units

cooling, heat pump and electric heating

air conditioning system components and piping selection

air conditioning 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

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 and motor selection

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 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

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 HVAC systems must include at least the following:

two different HVAC systems, including at least one of the following:

condenser

compressor

evaporator

associated components and controls