MARL039 — Apply advanced principles of marine engineering thermodynamics

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What an assessment for MARL039 must cover

193 assessable components: 15 elements (96 performance criteria), 9 performance evidence and 88 knowledge evidence requirements. An audit-defensible tool maps every question and task back to these — that mapping is the coverage matrix Auditori generates alongside the assessment.

Elements & performance criteria

1 Calculate heat mixtures involving water equivalent, change of phase and feed heating

1.1Key terms associated with heat transmission are explained
1.2Heat transfer is calculated between liquids and solids using water equivalent
1.3Flow is differentiated from non-flow heating and cooling processes
1.4Effects of superheating and sub-cooling on steam plant efficiency are outlined
1.5Enthalpy is applied to heat mixture calculations with or without phase change
1.6Enthalpy is applied to calculate resultant conditions of hot wells involving multiple returns
1.7Steam conditions in a system when using throttling devices and separators are calculated
1.8Entropy is distinguished from enthalpy
1.9Entropy values are determined from standard tables
1.10Mass balance throughout a steam plant cycle is constructed and effects of pressure and temperature on cycle efficiency are analysed

2 Determine fluid properties of steam

2.1Relationship between saturated and superheated steam, including dryness fraction, is explained
2.2Tables and/or diagrams are used to find enthalpy and entropy values for liquid, part liquid-part vapour and vapour states
2.3Carnot cycle is outlined
2.4Rankine cycle is outlined
2.5Isentropic efficiency is explained
2.6Problems are solved involving the efficiency of steam turbines operating in the Rankine cycle

3 Calculate boiler efficiency and boiler water density

3.1Concept of parts per million for density of boiler water is explained
3.2Changes in boiler water density due to contaminated feed are calculated
3.3How acceptable dissolved solids and water levels may be maintained in a boiler is shown

4 Apply Dalton’s Law of partial pressures to steam condensers

4.1Dalton’s Law is applied to calculate air and condensate extraction from condensers
4.2Problems are solved involving cooling water mass flow and cooling water pump work

5 Apply chemical equations for complete and incomplete combustion

5.1Atomic and molecular weights and kilogram-mole (kg-mol) are explained
5.2Elements and compounds present in fuel and the products of combustion are evaluated
5.3Calorific value of a fuel is calculated by chemical formula
5.4Mass of air required for stoichiometric combustion is calculated by gravimetric and volumetric analysis
5.5Chemical equations for combustion elements and compounds are developed and elements of combustion are analysed
5.6Air/fuel ratio, gravimetric and volumetric analysis are explained
5.7Air/fuel ratio is determined when supplied with composition of fuel and exhaust gas analysis
5.8Bomb calorimeter is used to find calorific value of a fuel

6 Calculate thermal expansion

6.1Coefficient of linear expansion and its significance to different materials is explained
6.2Clearances and shrunk fit allowances are calculated
6.3Stresses generated with restricted expansion are calculated
6.4Volumetric expansion of solid and liquids, and allowance required for fluid expansion in tanks and systems is calculated

7 Calculate gas conditions, work and thermal efficiency of internal combustion engines

7.1Compression and pressure ratio is explained and related to combined gas law equation
7.2Combined gas law equation is applied to constant volume and constant pressure processes
7.3Specific gas constant of a gas or mixture of gases is calculated
7.4Universal gas constant from Avogadro’s hypothesis is determined
7.5Differentiation is made between specific heat of gases, ratio of specific heats, work and change in internal energy
7.6Changes in internal energy associated with specific heat of gases, ratio of specific heats and work are calculated
7.7First law of thermodynamics is applied to thermodynamic processes in a closed system
7.8Second law of thermodynamics is applied to find thermal efficiency of Carnot cycle
7.9Mathematical formula is applied to solve problems related to ideal constant volume air standard cycle
7.10Mathematical formula is applied to solve problems related to diesel and dual cycles

8 Calculate performance of internal combustion and gas turbine engines

8.1Processes associated with expansion and compression of gases are explained
8.2Gas conditions and index of compression at end of each process are determined
8.3Work formula is derived for each process and derived formula is applied to calculate work and power per cycle
8.4Air standard cycle is applied to determine amount of fuel consumed and work produced by an internal combustion engine
8.5Differentiation is made between air standard efficiency and thermal efficiency
8.6Pressure/volume (P/V) and out-of-phase engine indicator diagrams are analysed
8.7Work, power, mean effective pressure and thermal efficiency of internal combustion engine cycles are calculated
8.8Heat transfer to jacket cooling systems is calculated
8.9Open and closed systems for gas turbines are outlined
8.10Temperature/entropy diagrams are applied to illustrate gas turbine cycles
8.11Power, isentropic efficiencies, thermal efficiency, work and fuel consumption for gas turbine cycles are calculated
8.12Methods to increase efficiency of gas turbines are specified
8.13Reheaters and intercoolers and how they improve efficiency is explained

9 Analyse air compressor performance

9.1Compressor types are classified
9.2P/V diagram is applied to describe operating cycle of reciprocating compressors
9.3Work done by constant pressure, isothermal processes and polytropic processes in reciprocating compressors is calculated
9.4Effect of clearance volume on efficiency of reciprocating compressors is explained
9.5Volumetric efficiency at free air conditions is explained
9.6Volume, mass flow and temperature are calculated at completion of each process in reciprocating compressors
9.7Intercooling and after-cooling effects on overall efficiency of reciprocating compressors is explained
9.8Heat transfer to air or cooling water from an air compressor is calculated
9.9Work is calculated for isothermal and adiabatic compression, and effect of clearance for reciprocating compressor
9.10Formula to calculate work and efficiency of centrifugal compressors is derived
9.11Pressure ratio for compressor types is analysed

10 Analyse vapour compression refrigeration cycles

10.1Design parameters for a vapour compression cycle are explained
10.2Pressure/enthalpy diagram is prepared for a refrigeration cycle
10.3Heat rejected, work done and coefficient of performance (COP) for a basic cycle is calculated
10.4Effect of subcooling and superheating is shown on a temperature/entropy diagram
10.5COP is calculated with evaporators operating at two different pressures
10.6Properties and hazards of refrigerants used in refrigeration and air conditioning (RAC) systems are identified
10.7Basic air conditioning cycles are explained

11 Apply psychrometric principles to solve air conditioning problems

11.1Comfort conditions for air conditioning systems are defined
11.2Key parameters used in defining air condition are illustrated on a psychrometric chart
11.3Cooling loads are calculated
11.4Problems associated with air delivering and distribution methods are analysed
11.5Methods of controlling noise and vibration in air conditioning systems are analysed

12 Analyse different methods of heat transfer

12.1Different forms of heat transfer are identified
12.2Heat flow through composite divisions is calculated
12.3Insulation dimensions and interface temperatures are determined
12.4Problems relating to radiated energy are solved by applying Stefan-Boltzmann Law
12.5Relative efficiency of contra-flow heat exchange is determined
12.6Problems in heat exchangers are solved by applying log mean temperature difference
12.7Radial conduction of heat through a thin cylinder is calculated

13 Perform calculations related to engine power and heat balances

13.1Formula is applied to solve problems related to indicated power of internal combustion engines
13.2Formula is applied to solve problems related to brake power of internal combustion engines
13.3Morse test is applied to determine the indicated power of internal combustion engines
13.4Tabular and graphical heat balance diagrams are applied to calculate mechanical, thermal and overall efficiencies of internal combustion engines

14 Determine steam velocity

14.1Principles and differences between pressure and velocity changes in reaction and impulse steam turbines are explained
14.2Velocity diagrams to calculate steam velocity at exit of nozzles and blades are applied
14.3Graphical and mathematical methods to determine blade angle, steam velocity, thrust, power, and efficiency of single stage impulse and reaction steam turbines are applied

15 Use nozzles

15.1Convergent nozzles are compared to convergent-divergent nozzles
15.2Steady flow equation is used to determine nozzle exit speed in terms of enthalpy
15.3Conditions for maximum mass flow through a nozzle are established

Performance evidence

assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices
communicating knowledge and ideas through verbal, written and visual means
explaining advanced principles of engineering thermodynamics
identifying and applying relevant mathematical formulas and techniques to solve advanced problems related to engineering thermodynamics
identifying and interpreting numerical and graphical information, and performing advanced mathematical calculations related to engineering thermodynamics, such as calculation of power, isentropic efficiencies, thermal efficiency, and work and fuel consumption for gas turbine cycles
identifying, collating and processing information required to perform advanced calculations related to engineering thermodynamics
reading and interpreting written information needed to perform complex calculations related to engineering thermodynamics
solving problems using appropriate laws and principles
using calculators to perform accurate, reliable and complex mathematical calculations

Knowledge evidence

air compressors, including: components
air compressors, including: faults and hazards
air compressors, including: first law of thermodynamics
air compressors, including: operating cycle of reciprocating air compressors
air compressors, including: performance characteristics
air compressors, including: property diagrams
air compressors, including: types
air compressors, including: uses
air compressors, including: working principles of reciprocating compressors
atomic and molecular weights and the kilogram-mole (kg-mol)
basic gas expansion and contraction, heat transfer
basic principles of engineering thermodynamics
Daltons Law of partial pressures
enthalpy
expansion and compression of gases
fluid properties, including: density
fluid properties, including: dryness faction
fluid properties, including: enthalpy of water
fluid properties, including: pressure
fluid properties, including: saturated steam
fluid properties, including: specific volume
fluid properties, including: superheated steam
fluid properties, including: temperature
gas laws
gas turbines
heat cycles, including: marine diesel engine
heat cycles, including: marine steam boiler and steam turbine
heat cycles, including: marine gas turbine
heat transfer, including: forms: conduction
heat transfer, including: forms: convection
heat transfer, including: forms: radiation
heat transfer, including: methods
heat transfer, including: principles
internal combustion engines, including: heat engine cycles
internal combustion engines, including: improvements
internal combustion engines, including: operating principles of two-stroke and four-stroke internal combustion engines
internal combustion engines, including: performance characteristics
internal combustion engines, including: second law of thermodynamics
internal combustion engine cycles
key terms, including: enthalpy of fusion
key terms, including: evaporation
key terms, including: sensible heat
key terms, including: transfer of heat energy
laws of thermodynamics
methods, including: duct attenuators
methods, including: duct lining
methods, including: lined duct splitters
methods, including: lined plenums
methods, including: natural attenuation
methods, including: sound absorbing materials/placement
methods, including: vibration isolators
methods, including: white noise
noise and vibration control, including: fundamentals of sound
noise and vibration control, including: noise and vibration problems
noise and vibration control, including: methods of control
operating cycle of reciprocating air compressors
operating principles of two-stroke and four-stroke internal combustion engines
parameters, including: adiabatic saturation or constant enthalpy
parameters, including: humidifying or dehumidifying
parameters, including: latent heat
parameters, including: sensible heat
principles of refrigeration, including: processes: adiabatic
principles of refrigeration, including: processes: isothermal
principles of refrigeration, including: processes: polytropic
principles of refrigeration, including: Rankine cycle
refrigeration and air conditioning (RAC) cycles and systems
steam plants
International System of Units (SI)
tables and/or diagrams, including: pressure-enthalpy
tables and/or diagrams, including: pressure-specific volume
tables and/or diagrams, including: specific enthalpy-specific entropy
tables and/or diagrams, including: temperature-pressure
tables and/or diagrams, including: temperature-specific enthalpy
tables and/or diagrams, including: temperature-specific entropy
thermodynamic and heat transmission, including: air conditioning combustion
thermodynamic and heat transmission, including: gas cycles/engine analysis
thermodynamic and heat transmission, including: heat transfer
thermodynamic and heat transmission, including: properties and vapours
thermodynamic and heat transmission, including: refrigeration
thermodynamic and heat transmission, including: steam cycles
thermodynamic principles
thermodynamic processes, including: adiabatic
thermodynamic processes, including: isobaric
thermodynamic processes, including: isochoric
thermodynamic processes, including: isothermal
thermodynamic processes, including: polytropic
thermal efficiency calculations
work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices

Unit content sourced from training.gov.au — © Commonwealth of Australia, licensed under CC BY 4.0. Auditori is not affiliated with the Department of Employment and Workplace Relations.

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Questions about assessing MARL039

What does an assessment tool for MARL039 need to cover?

To satisfy the Principles of Assessment and Rules of Evidence, an assessment for MARL039 needs to address all 193 unit components: 15 elements with 96 performance criteria, 9 performance evidence requirements, 88 knowledge evidence requirements, and the foundation skills. A coverage matrix mapping each question and task to these components is what an auditor looks for.

How does Auditori generate an assessment tool for MARL039?

Auditori pulls the current release of MARL039 from training.gov.au and generates a complete package: candidate assessment, assessor guide with model answers and observation criteria, and a coverage matrix mapping every component. A suitably qualified person then reviews and approves the draft in a built-in workflow — consistent with ASQA's guidance on AI use in VET — before export as branded PDF and editable Word.

Is the first assessment tool really free?

Yes. Every new account includes one free credit — enough to generate the complete assessment tool for MARL039 — with no card and no subscription required. After that it's pay-as-you-go per unit.

Can I check my existing MARL039 assessment instead of generating a new one?

Yes — upload your existing assessment or learner guide and Auditori maps it against every element, performance criterion, PE and KE of MARL039, showing exactly what's covered and what's missing. Mapping costs a quarter of a credit.

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