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

Demonstrate knowledge of the absorption refrigeration cycle 
SAQA US ID UNIT STANDARD TITLE
9468  Demonstrate knowledge of the absorption refrigeration cycle 
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 the principles of operation and application of absorption refrigeration systems and carry out basic design calculations. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Having a fundamental understanding of the thermodynamic principles and physical laws applicable to refrigeration. 

UNIT STANDARD RANGE 
Intermittent, continuous. Ammonia-water, lithium bromide-water systems.
Gas, steam, hot water, waste heat and electric operation 

Specific Outcomes and Assessment Criteria: 

SPECIFIC OUTCOME 1 
Explain and describe the operation of absorption refrigeration systems. 
OUTCOME RANGE 
Range : Water-Lithium Bromide and Water-Ammonia diagrams. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The difference between absorption and vapour compression refrigeration systems is described. 
ASSESSMENT CRITERION RANGE 
Range : Water-Lithium Bromide and Water-Ammonia diagrams.
 

ASSESSMENT CRITERION 2 
2. The various components of an absorption refrigeration system are identified and their operation explained. 

ASSESSMENT CRITERION 3 
3. The various types of refrigerants used in absorption refrigeration systems are listed and their merits and limitations explained. 

ASSESSMENT CRITERION 4 
4. The various controls used in absorption systems are identified and their operation explained. 

SPECIFIC OUTCOME 2 
Discuss the applications of the various types of absorption refrigeration systems. 
OUTCOME RANGE 
Domestic, commercial, industrial and air conditioning. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The various types of absorption refrigeration systems are listed and their application explained. 

ASSESSMENT CRITERION 2 
2. The advantages, disadvantages and limitations of the various systems are explained. 

SPECIFIC OUTCOME 3 
Carry out basic design calculations. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Cooling load requirements are calculated using appropriate tables and graphs. 
ASSESSMENT CRITERION RANGE 
Water-Lithium Bromide and Water-Ammonia diagrams.
 

ASSESSMENT CRITERION 2 
2. Thermodynamic calculations are carried out to correctly size the various components of the system. 
ASSESSMENT CRITERION RANGE 
Generator, rectifier, absorber, evaporator, heat exchanger, pump.
 

SPECIFIC OUTCOME 4 
Carry out component selection. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. Components are selected on the basis of specified and calculated performance data. 
ASSESSMENT CRITERION RANGE 
Available or calculated primary energy driving source.
 

ASSESSMENT CRITERION 2 
2. Unit sizes are determined from manufacturer's selection data. 
ASSESSMENT CRITERION RANGE 
Tabular or graphical form. Computerises data.
 

ASSESSMENT CRITERION 3 
3. Protective and control devices are determined and selected. 

SPECIFIC OUTCOME 5 
Demonstrate procedures for servicing and operating absorption refrigeration systems. 

ASSESSMENT CRITERIA 

ASSESSMENT CRITERION 1 
1. The procedures followed for trouble shooting absorption refrigeration installations is explained. 

ASSESSMENT CRITERION 2 
2. Safety procedures applicable to operation and servicing of absorption refrigeration systems are explained. 

ASSESSMENT CRITERION 3 
3. The importance in adhering to the manufacturer's instructions regarding corrosion control is explained and discussed. 

ASSESSMENT CRITERION 4 
4. The importance of purging systems 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 
  • Thermodynamics properties of refrigerants used in absorption systems.
  • Principles of absorption refrigeration systems. 
    		•


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Identifying applications for absorption refrigeration 
    		•

    UNIT STANDARD CCFO WORKING 
    Work effectively with others
  • Work as part of a design and/or servicing team 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage myself and my activities responsibly and effectively
  • Selecting required component and accessory 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • Preparing design and/or servicing report 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • By understanding the absorption process and using thermo dynamical and fluid mechanical principles during design 
    		•

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems
  • Be aware of the effect of leakage of refrigerants on the environment 
    		•

    UNIT STANDARD CCFO CONTRIBUTING 
    Learner and societal development
  • By learning how an absorption refrigeration system operates 
    		•

    UNIT STANDARD NOTES 
    Specific requirements are contained in one or more of the following documents
  • Manufacturer`s instructions and technical information regarding the design and selection of absorption systems and components.
  • Operating and users instructions from manufacturers and suppliers.
  • Occupation 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.
     
    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.