Effect of a superheating and sub-cooling heat exchanger to the performance(3)

998K.Bakirci,D.Colak/Energy44(2012)996e1004

7.Receiver8.Dryer

9. Sight glass 10. Solenoid valve 11. Expansion valve

18.Electroniccounter19.Controlpanel

20. NTC temperature indicator 21. Data acquisition card22. Computer and monitor

a

bc

Fig.1.a)Aschematicrepresentationofthesystem(withoutSHCHE)b)AschematicrepresentationoftheheatpumpwithSHCHEandc)Outsideviewsoftheheatpump.

groundsourceheatpumpsystemintheheatingperiodof2010.Themeasurementsweretakenfrom8.00a.m.to18.00p.m.withanintervalof30min.Thetemperaturesmeasuredbythethermo-couplesweremonitoredinacomputerandrecordedbyadata-acquisitioncardineachsecond,whichwaslaterusedforanalysis.

Theelectroniccounter(digitalpowermeter)wasusedtomeasurethepowerconsumptionofthecompressorand,thepowerconsumptionsofthepumpsweremeasuredbyawatt-meter.Allthemeasuringprocessesofthetemperaturesweremonitoredandcontrolledbyapersonalcomputer-baseddata-acquisitionsystem.

2.1.Uncertaintyanalysis

Experimentalerrorsanduncertaintiescanresultfrominstru-mentselection,instrumentcondition,instrumentcalibration,environment,observationandreadingandtestplanning.Theuncertaintyanalysisisneededtoprovetheaccuracyoftheexper-iments[22].AnuncertaintyanalysiswasperformedusingamethoddescribedbyHolman[23].

ThetotaluncertaintiesofthemeasurementsareestimatedtobeÆ1.01%forthewaterandtheantifreeze-watersolutiontempera-tures,Æ2.05%forpressures,Æ1.00%forpowerinputstothe

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