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 complex air conditioning systems as described in 8) and including:

A

Developing outlines of alternative designs

B

Developing the design within the safety, regulatory, 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 complex air conditioning 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.

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 complex air conditioning systems.

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

KS01-EJ143A Complex HVAC system design

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

T1 HVAC load estimating of multiple zone and multi-storey buildings

System design parameters

human comfort

system requirements in accordance with AS1668

heat transfer calculations for complex structures and building components

heat and radiation transfer calculations through complex glass structures including various internal and external shading devices

indoor air quality

olfs and decipols

Complex shading

solar data, azimuth and altitude angles

shading from adjacent structures

Computer software

heat load estimating

building thermal performance analysis and simulation software

T2 Advanced Psychrometrics

Complex psychrometric processes

revise sensible cooling and heating and evaporative (adiabatic) cooling

cooling and dehumidification

cooling and dehumidification with high latent load

cooling and dehumidification all out door air

cooling and dehumidification all out door air with dehumidified air requirements less than supply air

cooling with evaporative humidification

cooling with near isothermal humidification

spray process to include cooling and dehumidification, cooling and humidification with heated spray water, heating and humidification.

partial load processes

reheat

bypass of, RA only and mix of RA & OA

variable air volume

variable coil effective surface temperature

split coil, horizontal, vertical and intertwined.

System performance

saturation efficiency of sprayers

system capacity calculated from air quantity and enthalpy change

Required plant capacity and airflow rates

effects of coil bypass factor and ADP

calculation of dehumidified air quantity, using both TSH and ERSH methods.

Recap on psychrometrics formulae and charts

properties of air

gas constants

derivation of air constants

combined gas laws

Dalton’s law of partial pressures

Carrier’s equation

psychrometric property tables

psychrometric charts

air mixing equations

air quantity equations

indirect evaporative coolers

analysis of cooling coil selection and performance

psychrometric analysis of:

air conditioning in tropics

all outdoor air

LCV/HWF systems

psychrometric analysis using equations and tables

T3 Air conditioning system design

Design parameters for multi-storey building

customer and objective

customer concept of environment desired

economic

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, multi-purpose

System selection criteria

economics

environment

control requirements

existing structures

new structures

system components

space for equipment and system

selection of appropriate system

System and applications

design features, engineering procedures and controls for:

direct expansion - self contained room/zone, heat pump, multi-zone fan-coils, central station

all water - room fan-coil

all-air - constant volume variable temperature, face and bypass, reheat, constant temp variable volume, constant volume induction, dual-duct, dual-conduit

air water - induction unit, primary air fan- coil

HVAC energy conversation techniques

heat recovery systems

night cycle

optimum stop/start

purge cycles

chiller/boiler/cooling tower sequencing

economy cycles (based on temperature or enthalpy)

supply air reset

supply water reset

condenser water temperature reset

power demand control

load limiting

load shedding

set point relaxation

ventilation cycles

plant - fixed OA to economy, boiler to electric reheat, constant volume to VAV etc.

cost-benefit (payback)

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 a complex air conditioning system incorporating multiple major components (i.e. air handling plant, compressors, condenser or evaporators) circuits or systems 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.