Thursday, October 20, 2016
REFRIGERATNI'ON AND" AIR CONDITIONING
6th Exam/Tech/4453/May 10
Duration: 3 Hrs. Max-
Marks: 75
Note: Attempt any five questions. O. No. 1 is compulsory.
Q1 Fill in the blanks:
i. One tone of refrigeration is equal to _________kJ/minute-
ll. Usually GOP is one.
iii. The boiling point of ammonia is
iv. is a refrigerant, which is highly toxic and
inflammable.
v. For unsaturated air, the dew point temperature is wet
bulb temperature.
vi. The sensible heat factor for auditorium or cinema
hall is generally kept as
vii. Most thermostatic expansion valves are set for a
superheat of
viii. Flooded evaporator has to be fitted with
ix. For ammonia refrigeration system, the tube of a shell
and tube condenser are made of
x. An Electrolux refrigerator is called a fluids
absorption system.
02 a. Describe with neat diagrams the working principle
and functions of mam parts of vapour compression system.
b. Explain the effect of superheating-g on the
performance of vapor compression system.
03 a. Give classification of refrigerants and any five of
them most commonly used and their one application each.
b. Describe briefly properties of an ideal refrigerant.
04 a. State merits and demerits of air refrigeration
system.
b. How will you calculate mass flow rate work clone and COP
for Bell Coleman cycle?
Q5. Describes briefly with the help of diagram the vapour
absorption system of refrigeration. In What way this system is advantageous
over the vapour compression system?
06 a. Explain the advantages and disadvantages of flooded
type evaporator.
b.
Differentiate between free and forced condensers.
Q7 a. Define "the terms: specific humidity, relative
humidity, degree of saturation, wet bulb temperature (WEIT) and: total enthalpy
of air.
b. Explain the significance of various lines on a psychometric
chart.
Q8 Write short note on:
a. Function of a compressor
b. Heat load estimation Capillary tube
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