Course Description : About this Course : ‘Oil in Refrigeration and AC Systems’ is a free online course that begins by introducing you to the safety devices on refrigeration plants and compressors, the single-stage vapour-compression refrigeration cycle, as well as fluorocarbon refrigerants based on methane and ethane. The types of leak tests (such as using soap, fluorescent dye and nitrogen) as well as electronic leak detectors (like ultrasonic, heated diode, heated electrolyte, infrared and corona discharge) are also vital to your knowledge. LEARNING OUTCOMES : Describe the ventilation systems used onboard Analyze the difference between natural and mechanical ventilation Describe the basic layout of a direct expansion system Discuss the principle of direct and indirect expansion systems Describe the working principle of an air-conditioning (AC) system