SAQA

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SOUTH AFRICAN QUALIFICATIONS AUTHORITY

REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE:

Carry out elementary airflow measurements and calculations

SAQA US ID	UNIT STANDARD TITLE
9540	Carry out elementary airflow measurements and calculations
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 3	NQF Level 03	4
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 is replaced by:

US ID	Unit Standard Title	Pre-2009 NQF Level	NQF Level	Credits	Replacement Status
116698	Carry out elementary airflow measurements and calculations	Level 3	NQF Level 03	4

PURPOSE OF THE UNIT STANDARD

Carry out calculations involving the dimensions of and the velocity in ducts. Measure the static, velocity and total pressure in a duct and explain their significance. Determine the pressures and the air quantity flowing in a duct.

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING

Carry out multiplication and division and calculate square roots. Manipulate simple formulas.

UNIT STANDARD RANGE

Commonly used pressure-measuring instruments, water gauge, incline gauge, electronic instruments.
Velocities and pressures as found in the average air-conditioning and ventilation systems.

Specific Outcomes and Assessment Criteria:

SPECIFIC OUTCOME 1

Carry out calculations involving sizes and areas of square and round ducts.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The area of a square and round ducts is calculated correctly.

ASSESSMENT CRITERION 2

2. Given the area the possible sizes of a square or rectangular duct are correctly calculated.

ASSESSMENT CRITERION 3

3. Given the area, the diameter of a round duct is correctly calculated.

ASSESSMENT CRITERION 4

4. Conversions from meters to millimeters and vice-versa are done correctly.

ASSESSMENT CRITERION 5

5. Correct SI units and symbols are used.

SPECIFIC OUTCOME 2

Carry out elementary airflow calculations.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Given the area and velocity in a duct, the volume flowing is correctly calculated.

ASSESSMENT CRITERION 2

2. Given the volume and the area, the velocity is correctly calculated.

ASSESSMENT CRITERION 3

3. The velocity pressure of the air is calculated correctly.

ASSESSMENT CRITERION 4

4. The velocity of the air is calculated correctly from the velocity pressure.

ASSESSMENT CRITERION 5

5. The correct SI units and symbols are used.

ASSESSMENT CRITERION 6

6. All units, where required, are converted correctly.

SPECIFIC OUTCOME 3

Prepare for measuring the air pressure in a duct.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The correct instrumentation is selected and checked for suitability.

ASSESSMENT CRITERION 2

2. The most suitable measuring points are selected.

ASSESSMENT CRITERION 3

3. Measuring instruments are checked for calibration (where applicable).

ASSESSMENT CRITERION 4

4. The correct measuring range is selected (where applicable).

SPECIFIC OUTCOME 4

Measure air pressures in a duct.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Instrumentation is handled with due care.

ASSESSMENT CRITERION 2

2. Pressures are correctly measured.

ASSESSMENT CRITERION 3

3. Positive and negative pressures are correctly identified.

ASSESSMENT CRITERION 4

4. The relationship between and the effect of the different pressures is explained.

SPECIFIC OUTCOME 5

Evaluate results.

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The effect of density on the pressures is explained.

ASSESSMENT CRITERION 2

2. The effect of friction in the duct on the pressures is explained.

ASSESSMENT CRITERION 3

3. The normal range of pressures in a duct is indicated.

ASSESSMENT CRITERION 4

4. The significance of the pressures is stated and explained.

ASSESSMENT CRITERION 5

5. The common instruments used for measuring duct pressures are listed and their uses discussed.

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

The importance of airflow in air-conditioning, refrigeration and ventilation systems
The importance of selecting the correct position and instrument to measure the pressure
The effect of altitude on air volumes and air pressures required.

Critical Cross-field Outcomes (CCFO):

UNIT STANDARD CCFO IDENTIFYING

Identify and solve problems

Selection of instruments to carry out particular measurements

UNIT STANDARD CCFO ORGANISING

Organize and manage myself and my activities

Select correct instrument and decide on correct usage

UNIT STANDARD CCFO COLLECTING

Collect, analyze, organize and critically evaluate information

Interpretation of results

UNIT STANDARD CCFO SCIENCE

Use science and technology effectively and critically

Appropriate use of instrumentation

By understanding the processes involved

UNIT STANDARD NOTES

This unit standard has been replaced by unit standard 116698, which is "Carry out elementary airflow measurements and calculations", Level 3, 4 credits.

QUALIFICATIONS UTILISING THIS UNIT STANDARD:

	ID	QUALIFICATION TITLE	PRE-2009 NQF LEVEL	NQF LEVEL	STATUS	END DATE	PRIMARY OR DELEGATED QA FUNCTIONARY
Core	20720	National Certificate: Air-Conditioning, Refrigeration and Ventilation	Level 3	NQF Level 03	Passed the End Date - Status was "Registered"	2004-06-13	Was MERSETA until Last Date for Achievement

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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