SAQA

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SOUTH AFRICAN QUALIFICATIONS AUTHORITY

REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE:

Demonstrate knowledge of noise control in air-conditioning, refrigeration and ventilation systems

SAQA US ID	UNIT STANDARD TITLE
13477	Demonstrate knowledge of noise control in air-conditioning, refrigeration and ventilation systems
ORIGINATOR
SGB Air-conditioning Refrigeration and Ventilation
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-
FIELD			SUBFIELD
Field 06 - Manufacturing, Engineering and Technology			Engineering and Related Design
ABET BAND	UNIT STANDARD TYPE	PRE-2009 NQF LEVEL	NQF LEVEL	CREDITS
Undefined	Regular	Level 5	Level TBA: Pre-2009 was L5	10
REGISTRATION STATUS		REGISTRATION START DATE	REGISTRATION END DATE	SAQA DECISION NUMBER
Passed the End Date - Status was "Registered"		2001-06-13	2004-06-13	SAQA 0836/01
LAST DATE FOR ENROLMENT		LAST DATE FOR ACHIEVEMENT
2005-06-13		2008-06-13

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.

This unit standard does not replace any other unit standard and is not replaced by any other unit standard.

PURPOSE OF THE UNIT STANDARD

Explain noise produced by equipment in air-conditioning, refrigeration and ventilation installations and propose measures to control and attenuate noise transmitted by this equipment into the building and environment.

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING

Basic knowledge of engineering science.
Thorough knowledge of noise producing equipment used in air-conditioning, refrigeration and ventilation installations.

UNIT STANDARD RANGE

Noise control systems as applicable to air-conditioning, refrigeration, and ventilation installations.

Specific Outcomes and Assessment Criteria:

SPECIFIC OUTCOME 1

Explain the principles of noise and its measurement.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The basic principles of noise generation are explained in terms of pressure variations with time, magnitude of pressure variations and their intensity.

ASSESSMENT CRITERION 2

2. The level of intensity is explained in terms of sound pressure level and sound power level.

ASSESSMENT CRITERION 3

3. The units of sound level are explained and the influence of audible frequency discussed.

ASSESSMENT CRITERION 4

4. The methods by which sound is measured is explained and demonstrated.

ASSESSMENT CRITERION RANGE

A-scale noise level, NC and NR curves.

ASSESSMENT CRITERION 5

5. The interaction between vibration and noise generation is explained.

SPECIFIC OUTCOME 2

Discuss and explain acoustical design criteria.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Typical sources of noise are listed and discussed.

ASSESSMENT CRITERION 2

2. Recommended noise design criteria for particular environments are discussed.

ASSESSMENT CRITERION 3

3. A typical system analysis is explained and demonstrated using catalogue or computerised methods.

ASSESSMENT CRITERION 4

4. The influence of absorptivity of various materials as well as room characteristics on the attenuation of sound is explained.

ASSESSMENT CRITERION 5

5. The transmission of fan and air noise in ducts is explained.

SPECIFIC OUTCOME 3

Specify requirements for sound attenuation equipment.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The information required to satisfactorily select sound equipment is listed and explained.

ASSESSMENT CRITERION 2

2. The consequences of the incorrect selection of sound attenuation equipment on the environment is explained.

SPECIFIC OUTCOME 4

Discuss sound control methods and procedures.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Advantages and limitations of various sound attenuation equipment for particular applications are discussed.

ASSESSMENT CRITERION 2

2. The various types of sound attenuation equipment are contrasted and explained.

ASSESSMENT CRITERION 3

3. Installation procedures of sound attenuation equipment are explained and the importance of the correct procedure discussed.

ASSESSMENT CRITERION 4

4. The construction of the various types of sound attenuation equipment is explained.

UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS

Any person wishing to be assessed against this unit standard may apply to an assessment agency, assessor or provider institution accredited by the relevant ETQA, who may appoint a moderator to be present at the assessment.

The assessor must have knowledge and experience of air-conditioning or refrigeration.

UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE

Knowledge of principles of noise generation.

Knowledge of various types of sound attenuation equipment.

Knowledge of properties of sound attenuation material.

Implications of incorrect sound control on people and environment.

Requirements of noise control in terms of Occupational Health and Safety Act

Critical Cross-field Outcomes (CCFO):

UNIT STANDARD CCFO IDENTIFYING

Identify and solve problems

Identify noise generation sources and their attenuation

UNIT STANDARD CCFO ORGANISING

Organise and manage myself and my activities responsibly and effectively

Establishing the correct procedures for the analysis of sound in systems and the correct selection of attenuation equipment

UNIT STANDARD CCFO COMMUNICATING

Communicate effectively

Oral and written reports to design engineers and erectors/artisans

UNIT STANDARD CCFO SCIENCE

Use science and technology effectively and critically

Using basic theory of acoustics to analyse noise generation in air-conditioning and refrigeration systems

UNIT STANDARD CCFO DEMONSTRATING

Demonstrate an understanding of the world as a set of related systems

Be aware of the impact of noise on people

UNIT STANDARD CCFO CONTRIBUTING

Learner and societal development

By learning how noise is generated and how it can be attenuated

UNIT STANDARD NOTES

Specific requirements are contained in one or more of the following documents:

Manufacturer`s recommendations and technical information regarding sound attenuation equipment.

Occupational Health and Safety Act.

QUALIFICATIONS UTILISING THIS UNIT STANDARD:

	ID	QUALIFICATION TITLE	PRE-2009 NQF LEVEL	NQF LEVEL	STATUS	END DATE	PRIMARY OR DELEGATED QA FUNCTIONARY
Elective	20722	National Diploma: Air Conditioning, Refrigeration and Ventilation	Level 5	Level TBA: Pre-2009 was L5	Passed the End Date - Status was "Registered"	2004-06-13	MERSETA

PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD:

This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.

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