Refrigeration and Air conditioning — Summer 2024

Enlist different types of refrigeration systems.

Enlist desirable properties of refrigerant and discuss anyone in detail.

Explain working of Bootstrap air refrigeration with neat sketch.

Enlist different types of air conditioning systems.

Discuss about future industrial refrigerants.

Write short note on cascade refrigeration system.

Write short note on practical H O- NH cycle.23

Arefrigeration cylce uses Freon-12 as the working fluid. The temperature of the refrigerant in the evaporator is –10°C. The condensing temperature is 40°C. The cooling load is 150 Wand the volumetric efficiency of the compressor is 80%. The speed of the compressor is 720 rpm. Calculate the mass flow rate of the refrigerant and the displacement volume of the compressor. Properties of Freon-12 below table. Temp. Sat. Pressure Enthalpy (kJ/kg) Sp. Volume (m3/kg) (°C) (MPa) Sat. Vapour -10 0.22 26.8 183.0 0.08 40 0.96 74.5 203.1 0.02

Enlist types of compressors and explain any one of them.

Explain evacuation and charging of refrigerants.

Explain layout of LiBr-H Osystems and its working.2

Write different expansion devices in VCR and explain any one of them.

Write short note on properties and classification of thermal insulation.

Enlist different factors governing effective temperature.

Discuss about selection of inside design conditions.

Write short note on load calculations for automobiles.

State different sensible heat load of buildings (any three)

Discuss effect of wall construction on cooling load.

Discuss flywheel effect of building material and its use in design.

State different factors affecting thermal comfort.

Explain economic factors influencing duct layout.

Write short note on requirements of air distribution system.

Explain difference between summer and winter air conditioning.

Explain split air conditioning system with neat sketch.

Write short note on packaged air conditioning plant.