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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

List, define and discuss the characteristics of commonly used refrigerants used in the refrigeration industry 
SAQA US ID UNIT STANDARD TITLE
9515  List, define and discuss the characteristics of commonly used refrigerants used in the refrigeration industry 
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 4  NQF Level 04  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
116408  List, define and discuss the characteristics of commonly used refrigerants used in the refrigeration industry  Level 4  NQF Level 04  4   

PURPOSE OF THE UNIT STANDARD 
Motivate the selection of a commonly used refrigerant for a refrigeration system by stating and explaining its characteristics and properties.
Determine the properties from tables or the pressure-enthalpy diagram.
Plot the refrigeration cycle on the P-h diagram 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Explaining the operation of vapour compression refrigeration systems. 

UNIT STANDARD RANGE 
Commonly used refrigerants applied to single stage refrigeration systems. 

Specific Outcomes and Assessment Criteria: 

SPECIFIC OUTCOME 1 
List the commonly used refrigerants and name and discuss their characteristics. 
OUTCOME NOTES 
List the commonly used refrigerants and name and discuss their desirable and undesirable physical characteristics. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The commonly used refrigerants are listed. 

ASSESSMENT CRITERION 2 
2. All desirable and undesirable physical characteristics of the commonly used refrigerants are listed, defined and discussed. 
ASSESSMENT CRITERION RANGE 
Miscibility, toxicity, flammability, odour, glide, ozone depletion potential, global warming potential, moisture reaction and leak detection
 

SPECIFIC OUTCOME 2 
Name and define the thermodynamic properties of commonly used refrigerants. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The thermodynamic properties of refrigerants are listed, defined and discussed. 
ASSESSMENT CRITERION RANGE 
Working pressure, Saturation temperature and pressure, specific volume, density, enthalpy, entropy, refrigerating effect, mass flow, volume flow.
 

SPECIFIC OUTCOME 3 
Plot refrigeration cycle on Pressure-Enthalpy diagram and determine refrigerant properties. 
OUTCOME NOTES 
Plot the refrigeration cycle on the Pressure-Enthalpy diagram and determine the refrigerant properties. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The correct pressure-enthalpy diagram is selected. 

ASSESSMENT CRITERION 2 
2. All parameters are plotted correctly. 

ASSESSMENT CRITERION 3 
3. The refrigerant properties are determined correctly from the diagram or tables. 

ASSESSMENT CRITERION 4 
4. The correct SI units and symbols are used. 

SPECIFIC OUTCOME 4 
Motivate the selection of a refrigerant. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The characteristics and properties of the refrigerant to be considered when selecting a refrigerant for a particular application are listed, discussed and explained. 

ASSESSMENT CRITERION 2 
2. The consequences of selecting a non-suitable refrigerant are listed and explained. 

ASSESSMENT CRITERION 3 
3. A refrigerant is selected which is suitable for the application. 

SPECIFIC OUTCOME 5 
State and discuss typical applications for the commonly used refrigerants. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The typical applications of the different commonly used refrigerants are stated. 
ASSESSMENT CRITERION RANGE 
High, medium or low temperature applications.
 

ASSESSMENT CRITERION 2 
2. Reasons for the applications are stated and 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 
That not every refrigerant is suitable for every application
The effects of selecting the wrong refrigerant
Determining refrigerant properties. 


Critical Cross-field Outcomes (CCFO): 

UNIT STANDARD CCFO IDENTIFYING 
Identify and solve problems
  • Selection of refrigerants. 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information
  • Critically analyse all operating parameters of a refrigeration system. 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • By understanding the processes involved. 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems.
  • The effects of releasing refrigerants into the atmosphere are realized. 
    		•

    UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 116408, which is "List, define and discuss the characteristics of commonly used refrigerants used in the refrigeration industry", Level 4, 4 credits.

    Assessment of this unit standard could be in the form of a written test. 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  20721   National Certificate: Air Conditioning, Refrigeration and Ventilation  Level 4  NQF Level 04  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.
     
    NONE 


    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.