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Bill Nielsen |
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4. REFRIGERANTS, PROCESSES AND SYSTEMS: The candidate is expected to be able to state the application, list, explain, describe, and/or sketch the following: a. The Halocarbons, Organic/Inorganic Compounds and Azeotropes classes of refrigerants, types and applications. b. Refrigeration processes: dry ice, freezing mixtures, volatile mixtures. c. Refrigeration systems: steam-jet, air-cycle, absorption, hermetic design of centrifugal machine. 5. INDUSTRIAL SYSTEMS AND SYSTEMS OPERATION: The candidate is expected to be able to state the application, list, explain, describe, and/or sketch the following: a. Multi-stage and cascade refrigeration systems. b. Purge systems, oil stills. c. Liquid receivers, coolers. d. Operating troubles encountered by the following: I. oil, moisture or water in the system. II. condensers, evaporators and regulators. III. refrigerant content (high or low). IV. by high/low compressor discharge temperatures. e. The lubrication requirements and problems (that may be encountered) for plants using anhydrous ammonia, carbon dioxide and freon. 6. THERMODYNAMICS OF REFRIGERATION AND CALCULATIONS: The candidate is expected to be able to: a. Explain the thermodynamics of vapour compression, the reversed Carnot Cycle, the Pressure-Enthalpy Chart. b. Perform calculations to solve for: I. Coefficient of performance (COP) for heat engines, refrigerating machines and heat pumps. II. Refrigerating effect, mass of refrigerant circulated (flow rate). III. Piston displacement, theoretical power. IV. Heat removed and/or ice made in a given time period. V. Compressor capacity expressed as tonnes of refrigeration. Note: Since recommended text material is in SI units, the examination will be in SI. Candidate is allowed to convert from SI to Imperial units. CERTIFICATION & EXAMINATION INFORMATION Eligibility to Write Be in possession of either a Refrigeration Operator “B” or a 3rd Class Operating Engineer Certificate. Practical Time Requirements: (effective June 27, 2001, as per new OE Regulations) … You will be eligible to obtain the “A” certification after successfully completing the required examinations and obtaining a minimum of 12 months operating experience as an Refrigeration Operator Class ‘B’ or as a 3rd Class Operating Engineer in an attended plant Coded R9 or R14. Refer to Table 6 of the Operating Engineers Regulation for plant rating/capacity. ‘or’ … You will be eligible to obtain the “A” certification after successfully completing the required examinations and obtaining a minimum of 11 months operating experience as an Refrigeration Operator Class ‘B’ or a 3rd Class Operating Engineer in an attended plant Coded R9 or R14 and having successfully completed a Refrigeration Operator Class ‘A’ course of study at a training facility that has been TSSA ‘approved-for-time-reduction’.
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