Thursday, October 20, 2016
REFRIGERATION AND AIR CONDITIONING
6th Exami/Mech/5306/
Duration:3Hrs. Max.
Marks: 75
Note: Attempt any five questions. O. No. 1 is compulsory.
01 Write short note on any five: 5x3
1. Differentiate between COP & efficiency.
ii. Explain the meaning of refrigeration effect.
iii. Give units of following terms: unit of
refrigeration, relative humidity, C.O.P., entropy, enthalpy, refrigeration
effect
iv. Name any three methods of refrigeration.
v. Define the following terms: psychrometry, sensible
heat, specific humidity
vi. Explain briefly what you understand by "by pass
factor“.
Q2 a. Describe the principle and functions of main parts
of a vapour compression system.
b. Discuss effect of sub cooling and superheating in a
vapour compression system.
Q3 a: Give classification of refrigerants and name any
five of them most commonly used and their one application each.
b. Describe briefly properties of an ideal refrigerant.
Q4 a. Give advantages and disadvantages of air
refrigerant system over vapour compression system.
b. Explain working of Bell Coleman cycle and give
expressions for mass flow rate, work done and GOP.
Q7 a. Describe a refrigeration system working of solar
power.
b. Explain the working of domestic Electrolux
refrigerator.
08 a. Describe the functions and working of any one
compressor of a refrigerator.
b. What is the purpose of a condenser? Give a comparison
of water-cooled and air-cooled condenser.
Q7 a. Define the following terms and give their
importance in an air conditioning system- DBT,
WET, DPT, degree of saturation total enthalpy of air.
b. Explain the significance of various lines on a
psychrometric chart. 10,5
Q8 a. Enumerate various heat sources for calculation of
heat load in an air conditioning system and factors affecting them.
b. Differentiate between room sensible heat factor,
effective room sensible heat factor and grand sensible heat factor.
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