Effect of a superheating and sub-cooling heat exchanger to the performance(7)

1002K.Bakirci,D.Colak/Energy44(2012)996e1004

a

654COP

321008:00

654COP

321008:00

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16:0018:00

b

654COPS

COPS

6

54321008:00

321008:00

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With (Jan. 20) and without (Jan. 23) SHCHE With (Feb. 05) and without (Feb. 03) SHCHE

Fig.5.Performancecoef cientsversustimeofdayforthesystemswithandwithoutSHCHE,fora)Heatpumpandb)Overallsystem.

Fig.5showsthevaluesoftheperformancecoef cientoftheheatpump(COP)andoverallsystem(COPS)versustimeofdayforthesystemswithandwithoutSHCHE.AsshowninFig.5,thevaluesoftheCOPforthesystemswithandwithoutSHCHEvaryfrom2.1to2.7andfrom2.4to2.6inJanuary,whiletheychangefrom2.6to3.3andfrom2.7to3.3inFebruary,respectively.Additionally,thevaluesoftheCOPSforthesystemswithandwithoutSHCHEvaryfrom1.9to2.5andfrom2.1to2.3inJanuary,whiletheychangefrom2.4to3.1andfrom2.5to3.1inFebruary,respectively.TheaveragevaluesoftheCOPforthesystemswithandwithoutSHCHEarecalculatedtobe2.31and2.47inJanuary,whiletheyarecalculatedtobe2.73and2.81inFebruary,respectively.TheaveragevaluesoftheCOPSforthesystemswithandwithoutSHCHEarealsocalculatedtobe2.07and2.19inJanuary,whiletheyarecalculatedtobe2.55and2.62inFebruary,respectively.Thevariationsintheinlet-outlettemperaturedifferences(TeaiÀTeao)oftheantifreeze-watersolutiontotheGHEunitwithtimeofdayforthesystemswithandwithoutSHCHEaregiveninFig.6.

ThedailyaveragevaluesofthemeasureddataandcalculatedresultsaregiveninTable4.Thesevaluesconsistoftheaveragevaluesofthemeasurementsof21recordedfrom8.00a.m.to18.00p.m.withanintervalof30min.AsseeninTable4,thecondensationpressuresinaverageareabout15barand,thisvalueisveryreasonablebecausethemaximumdischargepressurelimitofthecompressoris29bar.

8

8

6Teai-Teao (°C)

6Teai-Teao (°C)

44

2

2

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Time of day

With(Jan. 20)andwithout (Jan. 23)SHCHEWith(Feb. 05)andwithout(Feb. 03)SHCHE

Fig.6.Variationsininlet-outlettemperaturedifferences(TeaiÀTeao)oftheantifreeze-watersolutiontotheGHEunitwithtimeofdayforthesystemswithandwithoutSHCHE.

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