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National Curriculum

1. Module details

Module name Heat Load Estimating (Commercial Refrigeration)

Module duration One Module (36-40hrs)

Module code EA139.1

Discipline code TBA

2. Module purpose To enable students to carry out a Heat Load Estimate fora Commercial or Industrial Refrigeration System

3. Prerequisites

4. Relationship to

competencystandards

NES 404e, NES503e, NES303e

5. Content 1. Heat Transfer

Factors affecting heat transferInsulation material characteristicsVapour barriers(seals)Ambient conditionsComposite walls (heat flows)Types of common insulationThermal conductivityFilm factors

2. Air change loadRoom volumesRoom usage (average, medium, heavy)Heat removed from cooling air torefrigerated conditionsAir curtainsTemperature differencesDoor opening sizes

3. Product loadSensible heatLatent heatHeat of respirationStorage temperaturesUnit running timesHumidityAir flowsStacking of products

4. Miscellaneous loadsElectrical

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National Curriculum

HumanDefrostMachinery

5. Total freezer/cool room loads

Wall loadAir change loadProduct loadMiscellaneousTotal load, safety factor and unit running times

6. Process cooling loadsCooling chemical reactionsEnergy balance methodsSensible & latent cooling of gasesSensible & latent cooling of water vapour in gas

streams

7. Computer programs

8. Cabinet construction and designDeep freeze caseMeat caseDairy caseFruit and vegetable caseDrink cabinets

6. Assessment strategy

Assessment methods Short Answer Questions/Assignment

Practical sessions

Conditions of

assessment

7. Learning outcome

details

Learning outcome 1 Calculate a cool / freezer room wall heat load usingheat transfer formulae.

1.1 Determine room conditions from specifications andtables

1.2 Calculate heat transfer through a wall using C, U,and R factors

Assessment criteria

1.3 Calculate the heat transfer through a given freezer/ cool room using varying thicknesses and

conditions

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National Curriculum

Learning outcome 2 Calculate the air change loads for a given room usingrelevant tables

2.1 Calculate the volume of a given room

2.2 Estimate the number of air changes per room

volume

Assessment criteria

2.3 Calculate the air change load for a given room andconditions

Learning outcome 3 Calculate the product load of a freezer / cool roomusing data from relevant tables

3.1 Calculate sensible, latent and respiration productheat load

Assessment criteria

3.2 Calculate loads for products above and below

freezing

Learning outcome 4Calculate the miscellaneous heat loads of a freezer/cool room

Assessment criteria 4.1 Calculate the heat added to a room via:

electrical load

human load

defrost load

machinery load

Learning outcome 5Calculate a detailed load estimate for a commercialrefrigeration system using relevant tables

Assessment criteria 5.1 Complete all performance criteria as for learningoutcomes 1.4 and complete a detailed loadestimate including total load, safety factor and unitrunning times

Learning outcome 6Complete a detailed load estimate for a commercial

refrigeration system using a computer softwareprogram.

Assessment criteria 6.1 Complete a heat load survey using an acceptedcomputer software program to determine the heatload of a cool / freezer room

Learning outcome 7Describe the operating characteristics of selectedcommercial refrigeration cabinets

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Assessment criteria 7.1 Identify the different types of cabinets and explainthe operating characteristics of each

defrost systems / heat

temperature control

air flows (refrigeration)

air screens (refrigerated, ambient, store)

types of evaporators

lighting

8. Delivery of the

module

Delivery strategy Class room , on site , by assignment

Resource requirements Physical resourcesAccess to a IBM compatible computer is desirable.

Texts/references

Australian Refrigeration and Air ConditioningVolumes I & II A CR & D PROJECT TRUSTPUBLICATION

Dossat, RJ: Principles of Refrigeration, Second Edition,SI Version, John Wiley and Sons, New York

Occupational health

and safety requirements

Students should be made aware of occupational healthand safety issues in all situations and be expected todemonstrate safe-working practices at all times.