Jiwaji University 2006-1st Sem B.Tech Mechanical Engineering REFRIGERATION & AIR CONDITIONING IV Regular s, set 4 - Question Paper

Code No: RR410305 Set No. 4
IV B.Tech I Semester Regular Examinations, November 2006
REFRIGERATION & AIR CONDITIONING
(Mechanical Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1. (a) provide a brief description of an ideal cycle of air refrigeration. [6]
(b) A carnot refrigerator and a heat pump are supplied with equal amount of
work. The refrigerator operates ranging from 270C
and +270C and the heat pump
operates ranging from + 450 C and + 270C. The refrigerator absorbs 4000 kJ/ min
at 270C.
The heat pump absorbs all the heat rejected by the refrigerator and
supplies at 450C. calculate
(i) COP of refrigerator
(ii) COP of heat pump
(iii)heat available at + 450C and
(iv) work input to every unit. [10]
2. (a) define the use of liquid vapour regenerative heat exchanger in a vapour
compression system [6]
(b) A simple saturation ammonia compression system has a high pressure of 1.35
MN/m two and low pressure of 0.19 MN/m 2. obtain per 400,000kJ/h of refrigerating
capacity the power consumption of the compressor and COP of the cycle.
[10]
3. (a) discuss the working of a rotary screw compressor. [10]
(b) How the capacity control is achieved in refrigerant compressor? [6]
4. (a) discuss the working of an evaporative condenser.
[10]
(b) provide the comparison of flooded evaporators and dry evaporators.
[6]
5. (a) What is the effect of inert gas in 3 fluid refrigeration system.
[4]
(b) What is absorption refrigeration system and how it differs from convention
vapour compression system and discuss its working. [8]
(c) What is Carnot COP of absorption refrigeration system. How it is differ from
true COP. [4]
6. (a) With the help of a sketch of the processes on Mollier chart discuss how the
refrigeration is produced in steam jet refrigeration system. [10]
(b) What difference does it make when the steam jet refrigeration system operates
with a barometric condenser instead of a surface condenser? [6]
7. An auditorium of 100 seating capacity of conditioned for the provided specifications
Out door conditions 35
and 65% RH
needed air inlet conditions 15o
C and 40 RH.
The needed condition is achieved 1st by cooling and dehumidifying and then by
heating. obtain the subsequent
(a) The capacity of the cooling coil in tons of refrigeration
(b) Capacity of the heating coil in kW
(c) Bypass
factor of the heating coil if the surface temp of the coil is 22o C [16]
8. (a) describe the subsequent in relation to the conditioned supply air to room ‘Throw’,
‘Drop’ and ‘Spread’. [6]
(b) State the various kinds of supply air out lots.
(c) define the factors governing the selection and location of supply air outlets.
[4]
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Earning:   Approval pending.