M.Tech I Year II Semester (R17)
Compressors-Types : constructional details of reciprocating compressors - volumetric efficiency- factors affecting volumetric efficiency-effects of evaporator and condenser pressures- centrifugal compressor - constructional details, applications : Comparison with reciprocating compressors - screw compressors, working principle, single screw and double screw compressor, lubricating oils- rotary compressor-single vane and multi vane compressor surging-Electric motors and control circuits.
Condensers: types-water cooled & air cooled condensers-evaporative type, thermal design of compressor-temperature distribution and heat flow in a condenser, pressure drop, fouling factor-LMTD correction factor. (No problems) Cooling Towers: Classification-performance of cooling towers-analysis of counter flow cooling towers-enthalpy-temperature diagram of air and water. Cooling ponds: types-cross flow cooling towers-procedure for calibration of outlet conditions.
Evaporators: types-flooded & dry evaporators-natural & forced convection type-shell &tube, shell & coil, plate type-secondary evaporators-temperature distribution and heat flow in evaporators-pressure drop, fouling correction factor, (no problems)
Expansion Devices - Capillary tube, thermostatic expansion valve, float valve, automatic expansion valve, solenoid control valve— pipe design-general-water piping, refrigerant piping & steam piping- water treatment-corrosion control, scale formation control-Refrigerant flow controls.
Installation of Vapor Compression Refrigeration System: evaluation & dehydration-testing for leakages-charging-adding oil defrosting-methods-material, automatic, periodic defrosting-solid & liquid adsorbents; water defrosting - defrosting by reversing the cycle, automatic hot gas defrosting-thermo balance defrosting, electric control defrosting (no problems)
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