Lovely Professional University 2012 B.Tech Mechanical Engineering MEC303 Refrigeration and Air conditioning (Session : 2011 - 12 Term - II) - Question Paper
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Courae: MEC303::REFRIGERATlON AND AIR CONDfTfONING TVnt AJIowedidftrt Ite.Uarki: 100
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| Part A
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b) Wtmmm miimlaelwswntMJiijBifefof pressure <>op to Owctrt tSMsta}
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$VMts Grand SmtteHeU Factor (GSHF)? (2Mk$|
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, 02.B) Hw w can un Waellve lansMa heat factor to determine apparatus dw port? (S MaiM
b) Whtt are various faeiofa afTscsklog thermal comfort? [0 Marks]
6) feWaln tha noirianelatura of tha following refrigerants:
R22 i R121 R134 , Rl34a , R 717 . R744 ana R71S [i Mart"]
PartB
Q3. &9ttln Air Wur and Its various processes? [1ft Marks]
04. &9Wn various types of Air Refrigeration Systems used in aircrafts. ;15 Marks)
PftC
06. A email office haB of 25 persons capacity is provided with summer air conditioning system wtth following datt
& 1. OrtMe condilions = 34cC DBT and 28 WBT,
2. Inatte conditions 24C DBT end SOHRH.
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fehertbedinBwcoora - 1250001**
Mkadtoieinin = 42000 WctffeSMI?
Q8. In air condoning system air at a flow rale of 2 fcgfr enters the cooing coil at 2SC and 50% RH and
leewthecoofingcoUat 11Catd 90% RH.Theapparabdewpointof fre cooling col is 7 C. find a) The required cooing capacty of the coft,
b> Sensfete Heat factor forth process, and
c) By-pass factor of the cooling coi.
Aaaune the barometric pressui* to be 1 atm. Assume the condensate water to leave the col at ADP(hws
29.26 kJAtg) [15MarteJ
Q7.100 m* Of atmospheric air at 25C 06T and 12 C WBT is flowing per minute through the duet Dry saturated steam at 100C is Injected into the air stream wtt a rate of 1.2 kmit Calculate the temperature of the air after mixing the steam.
Take atmosphsrtc pressure = 1.033 bar (15 Marks]
Q8. (i) How does simple VCRS differs from Reversed Carnot Cycle?
(ti) In an ammonia vapor compression refrigeration system, the pressure in the evaporator is 2 bar. Ammonia at exit is 0.85 dry and at entry its dryness fraction is 019. During compression, the worlt done per Kg of ammonia is 150 KJ. Calculate the COP and the volume ti vapor entering the compressor per minute, if the rate of ammonia circulation is 4.6 kg/min . The latent heat and specific volume at 2 bar are 1325 KJfrg and 0.68 cubic metre per kg respectively 115 Maries]
- End of Question Paper -
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| Earning: Approval pending. |
