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Evidence Guide: MARL043 - Apply basic principles of marine engineering thermodynamics

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

MARL043 - Apply basic principles of marine engineering thermodynamics

What evidence can you provide to prove your understanding of each of the following citeria?

Explain common thermodynamic principles

  1. Desired International System of Units (SI) applicable to thermodynamic calculations are developed
Desired International System of Units (SI) applicable to thermodynamic calculations are developed

Completed
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Basic properties of fluids are outlined

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Gauge pressure is distinguished from absolute pressure

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Temperature is defined and temperature scales are outlined

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Calculations are performed by applying formulae for work, power and efficiency

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Calculate properties of gas during expansion and compression

  1. Calculations are performed by applying Boyle’s, Charles’s and combined gas laws
Calculations are performed by applying Boyle’s, Charles’s and combined gas laws

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Gas equation is derived and applied to gas process calculations

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Specific heat of gases and the relationship between constant pressure (Cp), constant volume (Cv), gas constant (R) and Gamma (G) are defined

Completed
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Heat transfer is calculated for Cp and Cv processes

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Isothermal, adiabatic and polytropic processes are outlined and properties of gases after expansion and compression, including the effects of turbocharging, are calculated

Completed
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Work required to compress gases is illustrated and calculated

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Explain methods of heat transfer

  1. Different forms of heat transfer and their application to marine systems are explained
Different forms of heat transfer and their application to marine systems are explained

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Heat transfer through flat layers is calculated

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Purpose of insulation is explained

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Explain enthalpy and apply to mixture calculations

  1. Heat energy is defined
Heat energy is defined

Completed
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Fundamental formula for heat energy transfer is developed

Completed
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Specific heat and its application are identified

Completed
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Enthalpy and change of phase are outlined

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Heat mixture problems involving water equivalent, ice, water and steam are solved

Completed
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Specific heat of materials are calculated

Completed
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Latent heat and dryness fraction are identified

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Steam tables are used to find values of enthalpy for water, saturated and superheated steam and dryness fraction

Completed
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Temperature/enthalpy diagram is constructed from steam table data

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Explain steam plants and calculate thermal efficiency

  1. Basic steam plant cycles are sketched and function of each component is outlined
Basic steam plant cycles are sketched and function of each component is outlined

Completed
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Steam cycles on a temperature/enthalpy diagram are illustrated

Completed
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Effects of superheating and under-cooling are clarified

Completed
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Calculations are performed for heat supplied, rejected, work and thermal efficiency of a steam plant

Completed
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Methods of improving cycle efficiency are outlined

Completed
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Explain operation of internal combustion engine cycles

  1. Operating principles of two-stroke and four-stroke internal combustion engines are outlined
Operating principles of two-stroke and four-stroke internal combustion engines are outlined

Completed
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Differentiation is made, by use of a pressure/volume diagram, between Otto, diesel and dual combustion cycles

Completed
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Mean effective pressure is calculated from an indicator diagram

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Indicated power formula is developed and related calculations are solved

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Specific fuel consumption is defined and calculated

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Ideal cycle and air standard efficiency is defined

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Explain operating cycle of reciprocating air compressors

  1. Pressure/volume diagram is used to describe operating cycle of single stage reciprocating air compressors
Pressure/volume diagram is used to describe operating cycle of single stage reciprocating air compressors

Completed
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Mass of air delivered by single stage reciprocating air compressors is calculated

Completed
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Clearance volume and its effect on volumetric efficiency is outlined, and volumetric efficiency is calculated

Completed
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Work per cycle for isothermal and polytropic processes is calculated

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Explain operating cycle of RAC plant

  1. Principle of refrigeration is outlined
Principle of refrigeration is outlined

Completed
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Temperature/enthalpy and pressure/enthalpy diagrams are compared

Completed
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Refrigerants used in RAC machines are identified

Completed
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Refrigeration effect and plant capacity are defined

Completed
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Refrigeration tables are used to calculate refrigeration effect and condition of vapour after expansion

Completed
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Operating cycle of self-contained and centralised air conditioning systems are outlined and compared

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Relative humidity is defined and key features of a psychrometric chart are outlined

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Apply linear, superficial and volumetric expansion equations to calculate expansion of liquids and metals

  1. Expansion processes for metals is defined
Expansion processes for metals is defined

Completed
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Coefficient of linear expansion is outlined

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Linear expansion is applied to calculate machinery clearances and to shrink fit allowances

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Superficial and volumetric expansion of solids is calculated and recorded

Completed
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Apparent expansion of liquids in tanks is calculated and recorded

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Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include:

identifying and applying relevant mathematical formulas and techniques to solve basic problems related to engineering thermodynamics

identifying and interpreting numerical and graphical information, and performing basic mathematical calculations related to engineering thermodynamics, such as gas expansion and contraction, heat transfer, thermal efficiency, and the expansion of liquids and solids

identifying, collating and processing information required to perform basic calculations related to engineering thermodynamics

maintaining knowledge of current codes, standards, regulations and industry practices

performing accurate and reliable mathematical calculations using a calculator

reading and interpreting written information needed to perform basic calculations related to engineering thermodynamics

solving problems using appropriate laws and principles.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

basic principles of engineering thermodynamics

enthalpy

expansion processes for metals (conduction, convection and radiation)

forms of heat transfer (conduction, convection and radiation)

gas laws

heat, including relationship between temperature, heat energy and heat transfer

internal combustion engine cycles

methods of heat transfer

operating cycle of reciprocating air compressors

operating principles of two-stroke and four-stroke internal combustion engines

principles of refrigeration

properties of fluids (density, mass, pressure, specific volume, temperature)

relationships between forms of energy, work and power

International System of Units (SI)

steam plants

thermodynamics, including:

energy change

heat transfer

ideal gases

thermodynamic energy

thermodynamic principles

thermodynamic processes

thermodynamic properties

thermodynamic systems

vapours

work transfer

thermal efficiency calculations.

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.