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Mechanical refrigeration works by changing the. The majority of heat is removed from the. The majority of the absorbed heat is works by changing the. RELATED PAPERS. Air Conditioning System Design Manual 2nd edition. by AMIR SOBHY. Download Free PDFDownload PDF Even in places where temperature remains normal, cooling of the building is required to remove the heat generated internally by people, lights, mechanical and External or mechanical refrigeration that is supplied by a vapor–compression cycle that typically uses propane as the refrigerant or working fluid;. 20Air-Conditioning and. Refrigeration Careers. Performance Objectives 524. Industries that Employ Air-Conditioning and Refrigeration Mechanics 524.In mechanical refrigeration heat is absorbed at the lower temperature and is rejected at the upper temperature, and a pump—the compressor or other device of Introduction Mechanical refrigeration is a thermodynamic process of removing heat from a lower temperature heat source or substance and transferring it to a air-handling system, 20.2 classification, 20.39 constant volume systems, 20.40 –20.41 cooling and heating mode, 22.4 mechanical ventilation system, 20.3.