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Level 6
Credits 15
Purpose This unit standard is intended for use in diploma courses in mechanical engineering, and covers knowledge and design of refrigeration systems for industrial applications.
People credited with this unit standard are able to: demonstrate knowledge of industrial refrigeration systems; and design, select components for, and prepare design documents for industrial refrigeration systems.
Subfield Mechanical Engineering
Domain
Status
Status date
Date version published
Planned review date
Entry information
Applied Principles of Mechanical Engineering
Registered
14 December 2007
19 March 2010
31 December 2015
Recommended: Unit 11385, Demonstrate and apply knowledge of fluid mechanics in mechanical engineering ; and Unit 21781, Explain and apply laws of thermodynamics in mechanical engineering; or demonstrate equivalent knowledge and skills.
Replacement information
Accreditation
This unit standard replaced unit standard 3827.
Evaluation of documentation and visit by NZQA and industry.
Standard setting body (SSB) Competenz
Accreditation and Moderation Action Plan (AMAP) reference 0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do
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New Zealand Qualifications Authority 2020

24535 version 2
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Special notes
1 References
Building Act 2004.
Building Code code .
. Available from http://www.dbh.govt.nz/bcl-get-a-copy-of-building-
Department of Building and Housing compliance documents for the New Zealand
Building Code (compliance documents). Available at http://www.dbh.govt.nz/building-code-compliance-documents .
2 Definition
Industry practice – the application of relevant legislation, regulations, standards, codes, and safe and sound practices, generally accepted by competent practitioners within the refrigeration and air conditioning industry .
3 Range a The performance of elements 2, 3, and 4 must reflect compliance with relevant legislation, regulations, standards, and codes of practice. b Industrial refrigeration systems – refrigeration systems using ammonia and halocarbon refrigerants, and serving large facilities such as freezing works, fish processing plants, breweries, food processing plants, chilled and frozen product stores, and cargo ships.
Evidence of two different systems is required.
Element 1
Demonstrate knowledge of industrial refrigeration systems.
Performance criteria
1.1 The principles of industrial refrigeration systems are explained with reference to components, operation, and system parameters.
Range system parameters – heat transfer, refrigerant circulation, pressures, temperatures, phase changes, refrigerants, compressor protection, oil management, non-condensibles management, capacity control, pressure control, temperature control, insulation, energy use, corrosion control, health and safety.
1.2 Components used in industrial refrigeration systems are described with reference to operation, construction, and capacity.
Range components may include – refrigerants, compressors, condensers, evaporators, receivers, oil separators, suction accumulators, pumps, pipes and associated fittings, insulation, pressure control valves, capacity control devices, defrosting devices, protective devices.
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Element 2
Design industrial refrigeration systems.
Performance criteria
2.1 Design provides a viable solution to the given requirements in accordance with industry practice.
2.2 Relevant parameters are determined in accordance with industry practice.
Range parameters – load estimation, operating temperatures, refrigerant flow rate, refrigerant pressure, heat rejection, refrigerant charge, control authority, energy use.
2.3 Design demonstrates sound methodology of analysis and use of relevant source data, in accordance with industry practice.
Range source data – building data; refrigerated product data; thermophysical data for refrigerants, air, and water; performance data for system components; units of measurement; regulations; standards; codes of practice.
Element 3
Select components for industrial refrigeration systems.
Range components may include
– refrigerants, compressors, condensers, evaporators, receivers, oil separators, suction accumulators, oil rectifiers, air purgers, pumps, pipes and associated fittings, insulation, refrigerant pressure control valves, capacity control devices, defrosting devices, protective devices.
Performance criteria
3.1 Component ratings are appropriate for the loads imposed on them in accordance with industry practice.
Range ratings
– refrigerant flow rate, working pressures, working temperatures, heat transfer capacity, maximum pressure, maximum temperature.
3.2 Selected components are suitable for the application in accordance with industry practice.
Range suitability may include consideration of
– function, durability, noise level, reliability, efficiency, ability to fit within available space, ability to be maintained.
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Element 4
Prepare design documents for industrial refrigeration systems.
Performance criteria
4.1 Documentation includes sketch plans showing the physical location of all components within the building in accordance with industry practice.
4.2 Documentation includes schematic drawings showing the interconnection of all components in accordance with industry practice.
4.3 Documentation includes specification of all components in accordance with industry practice.
4.4 Documentation includes operating description of the overall system and its components, includes a pressure/enthalpy diagram and prediction of energy use, and indicates key parameters and how they are measured in accordance with industry practice.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated authority for quality assurance, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact Competenz info@competenz.org.nz
if you wish to suggest changes to the content of this unit standard.
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New Zealand Qualifications Authority 2020