Test Bank For Refrigeration and Air Conditioning Technology - 9th - 2021 All Chapters - 9780357122273

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REFRIGERATION AND AIRC
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ONDITIONING




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, B.TECH. DEGREE COURSE
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SCHEMEGANDGSYLLABI

(2002-03GADMISSIONGONWARDS)

MAHATMAGGANDHIGUNIVERSITY

KOTTAYAM,KERALA


REFRIGERATIONgANDgAIRgCONDITIONING
Mg703ggggggggggggg
2+1+0
Moduleg1

Principlesgofgrefrigeration:gThermodynamicsgofgrefrigerationg-
gCarnotgcycle,greversedgcarnotgcycle,gheatgpump,gandgrefrigeratinggmachine-

gcoefficientgofgperformanceg-gunitgofgrefrigerationg-grefrigerationgmethods-

gconventionalgrefrigerationgsystems.gAirgrefrigerationgsystem-

gBellgColemangcycleg-

gC.O.P.gcapacitygworkgandgrefrigerantgflowgrequirementsgingBellg-

gColemangcycle.




Moduleg2

Vapourgcompressiongsystem:gsimplegcycleg-comparisongwithgCarnotgcycleg-
gtheoretical,gactualgandgreactiveg-

gCOPgeffectgofgoperatinggparametersgongCOPg-

gwet,gdrygandgsuperheatedgcompressiong-gundergcoolingg-

gactualgcyclegrepresentationgongTSgandgPHgdiagramsgsimplegproblems.gAdva

ncedgvapourgcompressiongsystemsg-
gmultistagegvapourgcompressiongsystemsg-

gflashgchambergmultiplegcompressiongandgevaporationgsystemsgcascadingg-

gsimplegproblems.




Moduleg3

Vapourgabsorptiongsystems:gsimple,gcyclesg-gactualgcycleg-
gammoniagwatergandglithiumgbromidegwatergsystemsg-gCOPg-
gelectroluxgsystem.gRefrigerantgandgtheirgproperties:gNomenclatureg-




2

, gsuitabilitygofgrefrigerantsgforgvariousgapplicationsg-
gunconventionalgrefrigerationgmethods-gVortexgtube,gsteam-
jet,gmagneticg(cryogenics)grefrigerationgandgthermoelectricgrefrigerationg-
gappliedgrefrigerationghousegholdgrefrigeratorsg-
gunitgairgconditionersgandgwatergcoolersg-gicegplantgcoldgstorage.



Moduleg4

Refrigerationgsystemgcomponents:gcondensersg-
gwatergandgairgcooledgcondensersg-gevaporativegcondensersg-

gexpansiongdevisesg-gcapillarygtube-gconstantgpressuregexpansiongvalveg-

gthermostaticgexpansiongvalveg-gfloatgvalvegandgsolenoidgvalveg-

gevaporatorsg-gnaturalgconvectiongcoilsg-gfloodedgevaporatorsg-

gdirectgexpansiongcoils.gReciprocatinggcompressors:gsinglegstagegandgmultista

gegcompressorsg-gworkgdonegoptimumgpressuregratio-geffectgofginterfoldingg-
gvolumetricgefficiencyg-effectgofgclearanceg-

gisothermalgandgadiabaticgefficiencyg-

gcompressedgairgmotors.gRotodynamicgcompressors:gScrewgandgvanegtypegco

mpressorsg-gprinciplegofgoperationg-
ghermetic,gsemihermeticgandgopengtypegrefrigerationgcompressors.




Moduleg5

Principlesgofgairgconditioning:gPsychrometrygandgpsychrometricgchartgthermo
dynamicsgofghumangcomfortg-geffectivegtemperatureg-
gcomfortgchartgappliedgpsychrometryg-gsensiblegheatgfactorg-
gpsychometricgprocess-
problems.gWintergairgconditioning:gheatinggloadgcalculationsghumidifiersgand
ghumidistat.gSummergairgconditioning:gcoolinggloadgcalculationsg-
gyeargroundgairgconditioningg-gunitarygandgcentralgsystemsg-
gprinciplesgofgairgdistributiong-gdesigngofgairgductgsystems.




References


1. Refrigerationgandgairgconditioningg -g BallaneygP.gL.
2. Refrigerationgandgairgconditioningg -g StockergW.gF.
3. Refrigerationgandgairgconditioning -g JordangandgProtester
4. PrinciplesgofgRefrigeration -g RoygJ.gDossat




3

, MODULEg– gI
AirgRefrigerationgCycles
1.1 g Introduction
Ingangairgrefrigerationgcycle,gthegairgisgusedgasgagrefrigerant.gIngoldengdays,ga
irgwasgwidelygusedgingcommercialgapplicationsgbecausegofgitsgavailabilitygatgfreegofgc
ost.gSincegairgdoesgnotgchangegitsgphasegi.e.gremainsggaseousgthroughoutgthegcycle,gth
ereforegthegheatgcarryinggcapacitygpergkggofgairgisgverygsmallgasgcomparedgtogvapourg
absorbinggsystems.gThegair-
cyclegrefrigerationgsystems,gasgoriginallygdesignedgandginstalled,garegnowgpracticallyg
obsoletegbecausegofgtheirglowgcoefficientgofgperformancegandghighgpowergrequireme
nts.gHowever,gthisgsystemgcontinuesgtogbegfavouredgforgairgrefrigerationgbecausegofgt
heglowgweightgandgvolumegofgthegequipment.gThegbasicgelementsgofgangairgcyclegrefr
igerationgsystemgaregthegcompressor,gthegcoolergorgheatgexchanger,gthegexpandergand
thegrefrigerator.
g


Beforegdiscussinggthegairgrefrigerationgcycles,gwegshouldgfirstgknowgaboutgt
hegunitgofgrefrigeration,gcoefficientgofgperformancegofgagrefrigeratorgandgthegdifferen
cegbetweengthegheatgengine,gagrefrigeratorgandgagheatgpump.

1.2 UnitsgofgRefrigeration
Thegpracticalgunitgofgrefrigerationgisgexpressedgingtermsgofg‘ tonnegofgrefrig
eration’ g(brieflygwrittengasgTR).gAgtonnegofgrefrigerationgisgdefinedgasgthegamountgo
fgrefrigerationgeffectgproducedgbygtheguniformgmeltinggofgonegtonneg(1000gkg)gofgice
fromgandgatg0oCging24ghours.
g


Sincegtheglatentgheatgofgicegisg335gkJ/kg,gthereforegonegtonnegofgrefrigeratio
n,




4