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Draw the T-s and p-h plots of actual vapour compression refrigeration cycle and
highlight its differences from a simple vapour compression refrigeration cycle.
With a neat sketch, describe the principle of working of vortex tube
refrigeration.

PART 13
Answer any three full questions, each carries 10 marks.

With schematic and T-S diagrams explain the working of cascade vapour
compression refrigeration system.
Explain the selection criteria of refrigerants for different applications.
With the help of schematic and p-h diagrams explain the working of a two stage
compression vapour compression refrigeration system with flash inter-cooling.
With the support of a schematic diagram, describe the working of a simple
Ammonia-Water vapour absorption refrigeration system.
How frost formation affects the working of a domestic refrigerator. Describe the
working of any frost free refrigerator?
Describe the working of any two types of compressors used in refrigeration
systems using neat diagrams.
With a neat sketch explain the construction and working of an automatic
expansion valve.
Explain the principle, working and application of a cooling tower.
PART C

Answer any four full questions, each carries 10 marks.
Find out the relative humidity, dew point temperature, density and enthalpy of
atmospheric air when dry bulb temperature is 35°C and wet bulb temperature is
23°C. Show the properties on a representative psychrometric chart.
What you meant by adiabatic dehumidification process? Show the process on a
representative psychrometric chart.
What is an air washer; show in a representative psychrometric chart the various
psychrometric processes that can be performed using an air washer.
An air conditioner is handling 2.5 m°/s of air at 40°C with specific volume of
0.862 2205 d.a. Find out the rate at which sensible heat must be added or
removed to cool the air to 13°C?
What are the major factors that influence human comfort? What is the

difference between ventilation load and infiltration load in air conditioning?

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