BASIC AIR CONDITIONING AND REFRIGERATION PRINCIPLES

UNIT – I REFRIGERATION 

- Introduction - Principle of refrigeration - Methods of refrigeration - Units of refrigeration - Coefficient of performance 

UNIT – II SIMPLE VAPOUR COMPRESSION REFRIGERATION SYSTEMS 

- Introduction - Components  of vapour compression refrigeration systems - Pressure-enthalpy (p-h) chart - Types of vapour compression cycles 

UNIT – III COMPOUND VAPOUR COMPRESSION REFRIGERATION 

- Introduction - Advantages of compound (or multi-stage) vapour compression with intercooler - Types of compound vapour compression with intercooler - Two stage compression with liquid intercooler - Two stage compression with water intercooler and liquid subcooler - Two stage compression with water intercooler, liquid subcooler and liquid flash chamber 

 UNIT – IV REFRIGERANTS - Introduction - Desirable properties of an ideal refrigerant - Classification of refrigerants - Designation system for refrigerants - Substitutes for chloral-fluoro-carbon (cfc) refrigerants - Comparison of refrigerants - Thermodynamic properties of refrigerants - Chemical properties of refrigerants - Physical properties of refrigerants