REFRIGERATION – AIR CONDITIONING

General Info

• Course Title: Refrigeration – Air Conditioning
• Course Code: NAOME1247
• Semester: 7th
• Course Type: S.B.¹
• Weekly Teaching Hours: 4 (Lectures)
• Credits (ECTS): 4
• Offered to ERASMUS+ students: Yes
• Course Website: https://eclass.uniwa.gr/courses/NA208/
• Professors: D. Koubogiannis , A. Hatziapostolou

Course Content / Syllabus

Lectures: Introduction, definition, thermal comfort air conditioning, industrial refrigeration, applications in Marine Engineering, kinds of cooling machines, thermodynamics of cooling cycles, inverse Rankine and Brayton cycles. Trigeneration plants. Theoretical and real cooling vapor compression cycles, compressor isentropic efficiency, superheating of refrigerant vapor, subcooling of refrigerant condensate. Calculation and improvement of coefficient of performance (COP). Two-stage and multi-stage refrigeration systems. Heat pump and its operation in heating and cooling modes. Elements of refrigeration plants: compressors (various types), condensers (air-cooled, water-cooled) evaporators, expansion valves, control and safety systems. Performance calculations in refrigeration plants. Vapor absorption refrigeration plants (Η2Ο/LiBr and ΝΗ3/Η2Ο). Environmental impact of refrigerants, Ozone Depletion Potential (ODP), Global Warming Potential (GWP). Reference to liquefaction cycles (high-low pressure), cryogenic gases. Psychrometry, psychrometric chart, psychrometric processes, sensible and latentloads, the air conditioning problem. Thermal comfort, required ventilation, selection of indoor and outdoor design conditions, kinds of cooling loads, thermal inertia, time lag phenomena. Calculation of heating and cooling loads. Overview of an air conditioning system. Mechanical installations. Classification of air conditioning systems. Calculation of air conditioning systems on the psychrometric chart. Design of air conditioning system in case studies. Calculation of cooling coil, hydraulic network, duct sizing and pump selection. Mechanical ventilation, calculation of air ducts, fans and air diffusers. Air-to-air heat exchangers. Part-load operation, energy consumption estimation. Reference to control and energy conservation systems in air conditioning plants.

Course Outline