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10000ME405122101

Explain the working of hermitically sealed reciprocating compressor used in
VCRS.
Explain how Ozone Depletion Potential and Global Warming Potential affect
the selection of refrigerant?
Write a short note on R-134a.
How refrigerant leakage can be detected?
Explain quick freezing method.
What is flooded evaporator and what are its advantages?
Describe, with neat sketches, any three controllers used in refrigeration
systems.
PART C

Answer any four full questions, each carries 10 marks.

Given that DBT = 25 °C and DPT = 17.5 °C, find the condition of air (a) WBT

(b) Relative Humidity (c) specific volume (d) enthalpy

Write a short note on Comfort chart and Bypass factor.

In an air conditioning system, the inside and outside conditions are dry bulb
temperature 25 °C, relative humidity 50 % and dry bulb temperature 40 °C, wet
bulb temperature 27 °C respectively. The room sensible heat factor is 0.8. 50 %
of the room air is rejected to atmosphere and an equal quantity of fresh air
added before air enters the air conditioning apparatus. If the fresh air added is
100 m*/min, determine: (a) room sensible and latent heat load (b) sensible and
latent heat load due to fresh air (c) apparatus dew point (d) humidity ratio and
dry bulb temperature of air entering air conditioning apparatus. Assume by-pass
factor as 0, density of air as 1.2 kg/m? at a total pressure of 1.01325 bar.

Using psychrometric schematic, show how to calculate ADP if RSHF is given.
Explain DPT and ERSHF line in psychrometric chart.

Explain the working of Year-round Air Conditioning system with schematic.
Explain the equal friction loss method in air conditioning design?

What are the air conditioning design requirements in designing an operation
theatre in hospital?

How can we calculate the internal and external cooling loads of a room?

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