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: 

Calculate the cooling requirements for cold and freezer rooms for short term and long term storage of consumables 
SAQA US ID UNIT STANDARD TITLE
9460  Calculate the cooling requirements for cold and freezer rooms for short term and long term storage of consumables 
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  6 
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 
Determine the cooling capacity for refrigeration plants for cold and freezer rooms for short and long-term storage of consumables for locations in South Africa. Determining the operating parameters of a refrigeration system. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Determine the properties of air from a psychrometric chart and carry out basic calculations involving heat and mass transfer.
  • Plot air-cooling processes on a psychrometric chart and determine plant-operating parameters. 
    		•

    UNIT STANDARD RANGE 
    Cold and freezer rooms with a volume up to 120 m 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Determine areas of heat transfer surfaces. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. All measurements are determined correctly from architectural drawings and/or site measurements. 

    ASSESSMENT CRITERION 2 
    2. The areas of the heat transfer surfaces are calculated correctly. 

    SPECIFIC OUTCOME 2 
    Select the correct internal plant operating conditions. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The correct conditions to be maintained inside the cold or freezer room are selected. 

    ASSESSMENT CRITERION 2 
    2. The consequences of selecting too high or too low conditions are stated and explained. 

    ASSESSMENT CRITERION 3 
    3. Design conditions are confirmed with client. 

    SPECIFIC OUTCOME 3 
    Select the correct external plant operating conditions. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The correct ambient conditions are selected. 

    ASSESSMENT CRITERION 2 
    2. The correct barometric pressure is selected. 

    ASSESSMENT CRITERION 3 
    3. The consequences of selecting too high or too low conditions are stated and explained. 

    ASSESSMENT CRITERION 4 
    4. Design conditions are confirmed with client. 

    SPECIFIC OUTCOME 4 
    Determine the refrigeration capacity required for a cold room. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Information required for a heat load calculation for a cold room is determined or obtained and is correct. 

    ASSESSMENT CRITERION 2 
    2. Calculations required are carried out correctly. 

    ASSESSMENT CRITERION 3 
    3. The plant capacity is calculated correctly. 

    ASSESSMENT CRITERION 4 
    4. The plant operating parameters are specified correctly. 
    ASSESSMENT CRITERION RANGE 
    Plant capacity and running hours, Storage temperature and relative humidity and maximum temperature difference (TD) on coil.
     

    SPECIFIC OUTCOME 5 
    Determine the refrigeration capacity required for a freezer room. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Information required for a heat load calculation for a freezer room is determined or obtained and is correct. 

    ASSESSMENT CRITERION 2 
    2. Calculations are carried out correctly. 

    ASSESSMENT CRITERION 3 
    3. The plant operating parameters are specified correctly. 
    ASSESSMENT CRITERION RANGE 
    Plant capacity and running hours, Storage temperature and relative humidity and maximum temperature difference (TD) on coil. Ambient temperature.
     


    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 
  • Application of scales on drawings.
  • Calculation of areas and volumes.
  • Theory of heat transfer by means of refrigeration.
  • Effect of coil TD on room relative humidity.
  • Selection of maximum operating hours. 
    		•


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Apply drawing scales correctly 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organize and manage myself and my activities
  • Select measuring instruments 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyze, organize and critically evaluate information
  • Reading and interpreting architectural drawings 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • Present oral report to client 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • Determine operating parameters correctly 
    		•

    UNIT STANDARD NOTES 
  • A generally accepted heat load calculation method is to be used.
  • Cold rooms operate at temperatures above zero degrees Celsius.
  • Freezer rooms operate at temperatures below zero degrees Celsius. 
    		•

    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.