24532 version 2
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Demonstrate and apply knowledge of air handling system design for
HVAC applications
Level
6
Credits
15
Purpose
This unit standard is intended for use in diploma courses in mechanical
engineering, and covers knowledge and design of air handling systems for
heating, ventilating, and air conditioning (HVAC) applications.
People credited with this unit standard are able to: demonstrate knowledge
of, design, select components for, and prepare design documents for air
handling systems.
Subfield
Mechanical Engineering
Domain
Applied Principles of Mechanical Engineering
Status
Registered
Status date
14 December 2007
Date version published
19 March 2010
Planned review date
31 December 2015
Entry information
Recommended: Unit 11385, Demonstrate and apply
knowledge of fluid mechanics in mechanical
engineering; and Unit 21781, Explain and apply laws of
thermodynamics in mechanical engineering; or
demonstrate equivalent knowledge and skills.
Replacement information
This unit standard replaced unit standard 3210 and unit
standard 3211.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Competenz
Accreditation and Moderation Action Plan (AMAP) reference
0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
 New Zealand Qualifications Authority 2016
24532 version 2
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Special notes
1
References
Building Act 2004.
Building Code. Available from http://www.dbh.govt.nz/bcl-get-a-copy-of-buildingcode.
Department of Building and Housing compliance documents for the New Zealand
Building Code (compliance documents). Available at
http://www.dbh.govt.nz/building-code-compliance-documents.
2
Definition
Industry practice – the application of relevant legislation, regulations, standards,
codes, and safe and sound practices, generally accepted by competent practitioners
within the mechanical building services industry.
3
Range
a The performance of elements 2, 3, and 4 must reflect compliance with relevant
legislation, regulations, standards, and codes of practice.
b Air handling systems – ventilation systems, ducted constant-flow rate and
variable-flow rate air conditioning systems, packaged and split air conditioning
units, air handling aspects of refrigeration systems.
Elements and performance criteria
Element 1
Demonstrate knowledge of air handling systems.
Performance criteria
1.1
The operating principles of air handling systems are explained with reference to
components, operation, and system parameters.
Range
1.2
parameters – air filtration, heating, cooling, de-humidification, and
humidification, heat flow rate, moisture flow rate, air flow rate,
pressures, temperatures, relative humidity, air distribution,
condensate drainage, insulation, human comfort, noise control,
product processing and storage, heat transfer, capacity control,
pressure control, temperature control, energy use, corrosion
control, air quality, health and safety.
The operating principles of components used in air handling systems are
described with reference to operation, construction, and capacity.
Range
components may include – fans, filters, air handling units,
dampers, economisers, silencers, ductwork, variable air volume
(VAV) boxes, grilles and diffusers, packaged air conditioning units,
evaporators, heat recovery units, pressure controls, temperature
controls, safety devices.
 New Zealand Qualifications Authority 2016
24532 version 2
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Element 2
Design air handling systems.
Range
evidence of design of a variable-flow rate air conditioning systems and one
other type of system is required.
Performance criteria
2.1
Design provides a viable solution to the given requirements.
2.2
Relevant parameters are determined in accordance with industry practice.
Range
2.3
parameters may include – load estimation, air filtration, heating,
cooling, de-humidification, and humidification, heat flow rate,
moisture flow rate, air flow rate, pressures, temperatures, relative
humidity, air distribution, condensate drainage, insulation, human
comfort, noise control, product processing and storage, heat
transfer, capacity control, pressure control, temperature control,
energy use, corrosion control, air quality, health and safety.
Design demonstrates sound methodology of analysis and use of relevant
source data, in accordance with industry practice.
Range
source data – building data, thermo-physical data for air and
water, information on comfort and product storage conditions,
performance data for system components, units of measurement,
regulations, standards, codes of practice.
Element 3
Select components for air handling systems.
Range
components may include – fans, filters, air handling units, dampers,
economisers, humidifiers, silencers, ductwork, VAV boxes, grilles and diffusers,
packaged air conditioning units, evaporators, heat recovery units, pressure
controls, temperature controls, safety devices;
selection of components for two different types of air handling systems is
required.
Performance criteria
3.1
Component ratings are appropriate for the loads imposed on them.
Range
ratings – flow rate, working pressure, working temperature,
working relative humidity, heat transfer capacity, maximum
pressure, maximum temperature, noise level.
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24532 version 2
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3.2
Selected components are suitable for the applications and in accordance with
industry practice.
Range
suitability may include consideration of – function, durability, noise
level, reliability, efficiency, ability to fit within available space,
ability to be maintained, comfort, storage conditions.
Element 4
Prepare design documents for air handling systems.
Range
documentation for two different types of systems is required.
Performance criteria
4.1
Documentation includes sketch plans showing the physical location of all
components within the building in accordance with industry practice.
4.2
Documentation includes schematic drawings showing the interconnection of all
components in accordance with industry practice.
4.3
Documentation includes specification of all components in accordance with
industry practice.
4.4
Documentation includes operating description of the overall system and its
components, prediction of energy use, and indicates key parameters and how
they are measured in accordance with industry practice.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact Competenz info@competenz.org.nz if you wish to suggest changes to the
content of this unit standard.
 New Zealand Qualifications Authority 2016