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Elements and Performance Criteria

1. Prepare to determine thermodynamic parameters of refrigeration and air conditioning system
   • Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures for a given work area are identified and applied
2. WHS/OHS risk control measures and workplace procedures are followed in preparation for refrigeration and air conditioning system work
3. Refrigeration and air conditioning system operating conditions are obtained from documentation or work supervisor to determine the scope of work to be undertaken
4. Advice is sought from the work supervisor to ensure refrigeration and air conditioning system work is coordinated effectively with others
5. Tools, equipment and testing devices needed to determine the refrigeration and air conditioning system operating conditions are obtained and checked for correct operation and safety
6. Determine thermodynamic parameters of refrigeration and air conditioning system
   • WHS/OHS risk control measures and workplace procedures for carrying out refrigeration and air conditioning system work are followed
7. Measurement of thermodynamic system operating parameters is conducted in accordance with WHS/OHS requirements and workplace safety procedures
8. System is checked and isolated in accordance with WHS/OHS requirements and workplace procedures
9. Actual and specified range of thermodynamic parameters are determined from measured and calculated values as they apply to refrigeration or air conditioning system in accordance to workplace procedures
10. Unexpected situations are discussed with appropriate person/s, responded to in accordance with workplace procedures and documented in a manner that minimises risk to personnel and equipment
11. Thermodynamic parameters are determined without damage to apparatus, circuits, the surrounding environment or services using sustainable energy practices
12. Document thermodynamic parameters
    • WHS/OHS work completion risk control measures and workplace procedures are followed
13. Worksite and equipment are cleaned and made safe in accordance with workplace procedures
14. Thermodynamic parameters are documented, including identification of any parameter that is not within the specified range for the refrigeration and air conditioning system
15. Work supervisor is notified of work completion in accordance with workplace procedures

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.
Determining thermodynamic parameters of refrigeration and air conditioning systems must include at least the following:	using measurement and calculation methods of a refrigeration or air conditioning system, including: temperature pressure relative humidity enthalpy

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Performance Evidence

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

selecting and using appropriate measuring devices correctly interpreting measurements using calculation methods accurately identifying parameters not within the specified range documenting thermodynamic parameters correctly dealing with unplanned events applying relevant work health and safety (WHS)/occupational health and safety (OHS) workplace procedures requirements, including the use of risk control measures applying sustainable energy principles and practices planning to determine thermodynamic parameters of refrigeration and air conditioning system.

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Knowledge Evidence

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

thermodynamic parameters of refrigeration and air conditioning systems, engineering mathematics fundamentals and refrigeration science, including: arithmetic: rational and irrational numbers, surds International System of Units (SI) units and conversion using unity brackets laws of indices (base 10), scientific and engineering notation estimations, errors and approximations, and significant figures algebra: substitution +, -, x on simple polynomials and simple indices expanding brackets factorising quadratics, common factors and difference of two squares simplifying algebraic fractions transposition of engineering formulae solving one variable equations simple algebraic division geometry: Pythagoras Theorem angles: degrees, radians and parallel lines cut by a transverse triangles: sum of angles, and properties of equilateral and isosceles triangles congruent triangles similar triangles: ratio of corresponding sides sin, cos, tan: ratios of a right-angled triangle sine and cosine rules circles: circumference, arcs, chords, tangents and circle theorems area and perimeter mensuration on above figures coordinate geometry: 2-D plane; x-y axes and s-t axes graph of linear function, y = ax + b and functional notation, y = f(x) straight line given slope and one point or given two points linear equations: solving algebraically and geometrically solving two linear functions simultaneously, algebraically and geometrically line segment: length and mid-point engineering mechanics: mass/density weight forces specific gravity equilibrium momentum friction loss velocity and speed energy in all forms mechanical advantage efficiency pressure/stress molecular theory: changes of state sublimation expansion and contraction electron flow state of aggregation internal potential energy phase change diagrams thermodynamics: temperature scales conservation of energy specific heat sensible, latent and super heat properties of steam enthalpy heat energy/temperature relationship heat balance on a body heat transfer conductivity calorimetry peltier effect 1st and 2nd law of thermodynamics gas laws and liquids: pressure Boyles law Charles law volumetric relationship psychrometrics latent heat of vaporisation relative humidity air conditioning processes dynamic pressure loss velocity and static pressure bourdon tubes density and relative density Archimedes principle Bernoulli’s equation manometers absorption refrigeration centrifugal compression external work of a liquid pressure volume diagrams isothermal and adiabatic processes polytropic processes Dalton’s law of partial pressure vapour compression: pressure/enthalpy relationship entropy characteristics of evaporation and condensation compression and pressure drop phases co-efficient of performance theoretical/practical cycles characteristics of refrigerants theoretical power input pressure losses heat exchange effects of condensing condition changes sub-cooling and superheating relevant job safety assessments or risk mitigation processes relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures.

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