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THERMAL ENGINEERING


UNIT I - GAS POWER CYCLES (15 hours)
Air standard cycles - Assumptions - Otto, Diesel, Dual - Air standard efficiency - Mean effective pressure and power; Brayton cycle - Reheat and regeneration.


UNIT II - VAPOUR POWER CYCLES (15 hours)
Rankine cycle - Performance - Comparison between Rankine cycle and Carnot cycle- Simple, reheat and regenerative cycle - Introduction to binary vapour cycle -Combined cycle.


UNIT III - AIR COMPRESSORS (15 hours)
Reciprocating air compressors - Types - Compression without clearance - Effect of clearance - multistage compression - Optimum intermediate pressure for perfect intercooling- Compressor efficiencies and mean effective pressure. Rotary compressors- Vane compressor, roots blower - Comparison between reciprocating compressors and rotary compressors.


UNIT IV - REFRIGERATION SYSTEMS (15 hours)
Vapour compression systems - Working principle, refrigerants - Classifications -Properties - Eco friendly refrigerants. Analysis of vapour compression refrigeration cycle, use of P-h chart, effect of sub cooling and superheating - Calculations of COP.Vapour absorption systems - types - Working principle, comparison.


UNIT V - PSYCHROMETRY AND AIR CONDITIONING (15 hours)
Properties of atmospheric air - Psychrometric chart, relations. Psychrometric processes - Sensible heating and cooling, cooling and dehumidification, heating and humidification, adiabatic mixing of two air streams. Air conditioning - Classifications -summer, winter, year round air conditioning system, window, split and centralized -Introduction to heat load calculations.
TOTAL : 75


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