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

Define and explain the principles of thermodynamics and carry out basic calculations involving heat 
SAQA US ID UNIT STANDARD TITLE
116236  Define and explain the principles of thermodynamics and carry out basic calculations involving heat 
ORIGINATOR
SGB Air-conditioning Refrigeration and Ventilation 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Manufacturing and Assembly 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 2  NQF Level 02  5 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 		 2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

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 
  • To make the learner aware of the definitions and terminology applicable to air conditioning and refrigeration.
  • To create an understanding of the basic principles of heat, energy and work as applied to air conditioning and refrigeration. 
    		•

    LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    Carry out simple calculations involving multiplications, divisions.
    Manipulating simple formulas. 

    UNIT STANDARD RANGE 
    Thermodynamics as applicable to air conditioning and refrigeration. 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Define and explain the relationship between force, work, power and energy. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The units of force, work, power and energy are correctly stated and defined. 

    ASSESSMENT CRITERION 2 
    The relationship between the units of force, work, power and energy is stated. 

    ASSESSMENT CRITERION 3 
    Basic calculations involving force, work, power and energy are carried out. 

    SPECIFIC OUTCOME 2 
    Define temperature and heat and explain the different forms of heat. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Temperature and heat are defined and the difference illustrated. 

    ASSESSMENT CRITERION 2 
    The difference between absolute and customary temperatures is explained. 

    ASSESSMENT CRITERION 3 
    Sensible heat and latent heat are defined and examples are given. 

    ASSESSMENT CRITERION 4 
    The three phases of matter are stated and the names for changes are listed. 

    ASSESSMENT CRITERION 5 
    Basic calculations involving sensible and latent heat are carried out. 

    SPECIFIC OUTCOME 3 
    Define pressure and explain the different pressures. 
    OUTCOME RANGE 
    Absolute pressure, barometric pressure, gauge pressure and vacuum. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The terms absolute pressure, barometric pressure, gauge pressure and vacuum are defined
    and explained. 

    ASSESSMENT CRITERION 2 
    The approximate barometric pressures at various altitudes are stated. 
    ASSESSMENT CRITERION RANGE 
    Sea level, 700, 1 400 and 1 700 metres altitude.
     

    ASSESSMENT CRITERION 3 
    Basic calculations involving absolute pressures, barometric pressures, gauge pressure and vacuum are carried out. 

    SPECIFIC OUTCOME 4 
    Define and explain the terms density, specific volume, airflow and mass flow. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The terms density, specific volume, airflow and mass flow are defined and explained. 

    ASSESSMENT CRITERION 2 
    Calculations involving density, specific volume, airflow and mass flow are carried out. 


    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 relationship between force, work and power.
    The understanding of heat in its different forms and how it is used in air conditioning and refrigeration.
    The understanding and significance of absolute pressure, pressure differences and vacuum.
    The difference between air volume flow and air mass flow. 

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Selecting the correct formula for the calculations. 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage myself and my activities responsibly and effectively.
  • Follow correct working procedures. 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Using formulas and doing manipulations correctly. 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems
  • Understanding the relevance of thermodynamics in many other subjects. 
    		•

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    Supplementary information:
    All terms and symbols used shall be strictly according to the SI system and as used in South Africa. 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  65449   National Certificate: Air-conditioning, Refrigeration and Ventilation  Level 2  NQF Level 02  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  MERSETA 
    Core  48959   National Certificate: Air-conditioning, Refrigeration and Ventilation  Level 2  NQF Level 02  Passed the End Date -
    Status was "Reregistered"     		 2009-03-12  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.