Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. |
1 | Explain common thermodynamic principles | 1.1 | Desired System International (SI) units applicable to thermodynamic calculations are developed |
1.2 | Basic properties of fluids are outlined |
1.3 | Gauge pressure is distinguished from absolute pressure |
1.4 | Temperature is defined and temperature scales are outlined |
1.5 | Calculations are performed by applying formulae for work, power and efficiency |
2 | Calculate properties of gas during expansion and compression | 2.1 | Calculations are performed by applying Boyle’s, Charles’s and combined gas law |
2.2 | Gas equation is derived and applied to gas process calculations |
2.3 | Specific heat of gases and the relationship between Cp, Cv, R and Gamma is defined |
2.4 | Heat transfer is calculated for constant pressure and constant volume processes |
2.5 | Isothermal, adiabatic and polytropic processes are outlined and properties of gases after expansion and compression including the effects of turbocharging are calculated |
2.6 | Work required to compress gases is illustrated and calculated |
3 | Explain methods of heat transfer | 3.1 | Different forms of heat transfer and their application to marine systems are explained |
3.2 | Heat transfer through flat layers is calculated |
3.3 | Purpose of insulation is explained |
4 | Explain enthalpy and apply to mixture calculations | 4.1 | Heat energy is defined |
4.2 | Fundamental formula for heat energy transfer is developed |
4.3 | Specific heat and its application are identified |
4.4 | Enthalpy and change of phase are outlined |
4.5 | Heat mixture problems involving water equivalent, ice, water and steam are solved |
4.6 | Specific heat of materials are calculated |
4.7 | Latent heat and dryness fraction are identified |
4.8 | Steam tables are used to find values of enthalpy for water, saturated and superheated steam and dryness fraction |
4.9 | Temperature/enthalpy diagram is constructed from steam table data |
5 | Explain steam plants and calculate thermal efficiency | 5.1 | Basic steam plant cycles are sketched and function of each component is outlined |
5.2 | Steam cycles on a temperature/enthalpy diagram are illustrated |
5.3 | Effects of superheating and under cooling are clarified |
5.4 | Calculations are performed for heat supplied, rejected, work and thermal efficiency of a steam plant |
5.5 | Methods of improving cycle efficiency are outlined |
6 | Explain operation of internal combustion engine cycles | 6.1 | Operating principles of two stroke and four stroke internal combustion engines are outlined |
6.2 | Differentiation is made, by use of a pressure/volume diagram, between Otto, Diesel and Dual combustion cycles |
6.3 | Mean effective pressure is calculated from an indicator diagram |
6.4 | Indicated power formula is developed and related calculations are solved |
6.5 | Specific fuel consumption is defined and calculated |
6.6 | Ideal cycle and air standard efficiency is defined |
7 | Explain operating cycle of reciprocating air compressors | 7.1 | Pressure/volume diagram is used to describe operating cycle of single stage reciprocating air compressors |
7.2 | Mass of air delivered by single stage reciprocating air compressors is calculated |
7.3 | Clearance volume and its effect on volumetric efficiency is outlined, and volumetric efficiency is calculated |
7.4 | Work per cycle for isothermal and polytropic processes is calculated |
8 | Explain operating cycle of refrigeration and air conditioning plant | 8.1 | Principle of refrigeration is outlined |
8.2 | Temperature/enthalpy and pressure/enthalpy diagrams are compared |
8.3 | Refrigerants used in refrigeration and air conditioning machines are identified |
8.4 | Refrigeration effect and plant capacity are defined |
8.5 | Refrigeration tables are used to calculate refrigeration effect and condition of vapour after expansion |
8.6 | Operating cycle of self-contained and centralised air conditioning systems are outlined and compared |
8.7 | Relative humidity is defined and key features of a psychrometric chart are outlined |
9 | Apply linear, superficial and volumetric expansion equations to calculate expansion of liquids and metals | 9.1 | Expansion processes for metals is defined |
9.2 | Coefficient of linear expansion is outlined |
9.3 | Linear expansion is applied to calculate machinery clearances and to shrink fit allowances |
9.4 | Superficial and volumetric expansion of solids is calculated and recorded |
9.5 | Apparent expansion of liquids in tanks is calculated and recorded |