NZQA registered unit standard
4829 version 6
Page 1 of 3
Title
Demonstrate knowledge of heat transfer and heat treatment in a dairy
processing operation
Level
3
Credits
Purpose
5
This theory-based entry-level unit standard is for people
carrying out milk processing functions in a dairy processing
operation.
People credited with this unit standard are able to demonstrate
knowledge of: heat transfer mechanisms and energy recovery;
heat transfer and heat exchange systems; and heat treatment
of milk, in a dairy processing operation.
Classification
Dairy Processing > Milk Processing
Available grade
Achieved
Explanatory notes
Legislation
Legislation relevant to this unit standard includes but is not limited to the Animal Products
Act 1999, Health and Safety in Employment Act 1992, and Animal Products (Dairy)
Regulations 2005.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of heat transfer mechanisms and energy recovery in a dairy
processing operation.
Evidence requirements
1.1
Mechanisms of heat transfer are described in terms of conduction and
convection.
1.2
Heat transfer is described in terms of factors influencing the rate of heat transfer
and operational limitations.
Range
1.3
factors include but are not limited to – temperature differential,
contact area, overall coefficient of heat transfer.
Heat transfer is described in terms of the use of regeneration for optimum
energy recovery.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
4829 version 6
Page 2 of 3
Outcome 2
Demonstrate knowledge of heat transfer and heat exchange systems used in a dairy
processing operation.
Evidence requirements
2.1
Direct and indirect forms of heat transfer are described in terms of their relative
advantages and disadvantages for heat treatment of milk.
Range
2.2
advantages and disadvantages include but are not limited to –
temperature-time profile, product denaturation, service media
dilution or contamination.
Indirect heat exchange systems are described in terms of dairy processing
applications including product characteristics and temperature.
Range
indirect systems include but are not limited to – tubular, plate,
scraped surface.
Outcome 3
Demonstrate knowledge of heat treatment of milk in a dairy processing operation.
Evidence requirements
3.1
Purposes of the heat treatment process are described in terms of product safety
and extension of the shelf life of milk products.
3.2
Categories of heat treatment of milk are described in terms of primary purpose
and typical time and temperature combinations.
Range
3.3
categories include but are not limited to – low temperature longtime, high temperature short-time, ultra-high temperature.
Effects of heat treatment of milk are described in terms of the end product and
the relationship between time and temperature in the heat treatment process.
Range
Planned review date
effects may include but are not limited to – protein denaturation,
texture, viscosity, microbial load;
evidence is required of two effects.
31 December 2020
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
4829 version 6
Page 3 of 3
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
22 June 1995
31 December 2014
Review
2
5 July 1999
31 December 2014
Review
3
26 August 2002
31 December 2014
Revision
4
13 June 2003
31 December 2014
Rollover and
Revision
5
17 July 2009
31 December 2016
Review
6
18 June 2015
N/A
Consent and Moderation Requirements (CMR) reference
0022
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMRs). The
CMR 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 the Primary Industry Training Organisation standards@primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016