UC Merced Solar Cooling Demonstra4on Project XCPC Array Driving Double Effect Absorp4on Chiller XCPC-External Compound Parabolic Concentrator §A pair of trough parabolic reflector with evacuated tube receiver that converts solar radia7on into heat. §XCPCs can accept incoming radia7on over wide angles without tracking required. Also can collect diffused sunlight(cloudy days). Cx from 1.15 to 1.55. §~50% thermal efficiency at 200°C.Rugged and tolerant to dus7ng. Seasonal 7lt adjustment is not required. Vapor Absorp4on Cooling Technology Thermally driven cooling cycle, No moving parts(No compressor). The refrigerant takes heat from the cooled space, turns into vapor, gets absorbed in the absorbent salt. This solu7on again heated by the heat source(Solar) to separate each other, passed to condenser to condense the refrigerant & this cycle repeats. Typical Performance η col ~ 0.38 Solar COP ~ 0.4 Dirty Performance η col ~ 0.32 Solar COP ~ 0.33 Cloudy Performance η col ~ 0.35 Solar COP ~ 0.36 Yogesh Bhusal, Benne. Widyolar, Roland Winston System Schema4c & Specifica4ons Collector Array N-S E-W Aperture Area 53.3m 2 45m 2 Inclina7on Angle 20 37 Concentra7on 1.15 1.4 # of Troughs 160 60 Capacity@200 o C 20 kW 18 kW Cooling Capacity 6.6 tons,23kW CW Storage 500 gallons COP 1.1 Broad Double Effect LiBr Absorp4on Chiller § Dual Fired (natural gas backup) § LiBr(absorbant) + H 2 0 (refrigerant ) pair § Double effect (2 stage) requires 140 °C § COP ~ 1.1 (cooling provided per heat) This project has been opera4ng for 6 years now &coun4ng. Contact: [email protected] Recently, solar cooling has regained the research interest due to development of solar collectors and the availability of hot water driven chillers which well match for sta7onary solar collectors with temperature range 80-160 o C. Triple effect chillers, which can poten7ally reach a COP of 1.7 with driving temperatures above 160 °C, are s7ll under development.

UC Merced Solar Cooling Demonstra4on Project

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Page 1: UC Merced Solar Cooling Demonstra4on Project

UCMercedSolarCoolingDemonstra4onProjectXCPCArrayDrivingDoubleEffectAbsorp4onChiller

XCPC-ExternalCompoundParabolicConcentrator§ A pair of trough parabolic reflector with evacuated tubereceiverthatconvertssolarradia7onintoheat.§ XCPCscanacceptincomingradia7onoverwideangleswithouttracking required. Also can collect diffused sunlight(cloudydays).Cxfrom1.15to1.55.§ ~50% thermal efficiency at 200°C.Rugged and tolerant todus7ng.Seasonal7ltadjustmentisnotrequired.

VaporAbsorp4onCoolingTechnologyThermallydrivencoolingcycle,Nomovingparts(Nocompressor). The refrigerant takes heat from thecooledspace,turnsintovapor,getsabsorbedintheabsorbentsalt.Thissolu7onagainheatedbytheheatsource(Solar)to separate each other, passed to condenser tocondensetherefrigerant&thiscyclerepeats.

TypicalPerformanceηcol~0.38

SolarCOP~0.4

DirtyPerformanceηcol~0.32

SolarCOP~0.33

CloudyPerformanceηcol~0.35

SolarCOP~0.36

YogeshBhusal,Benne.Widyolar,RolandWinston

SystemSchema4c&Specifica4ons

CollectorArray N-S E-W

ApertureArea 53.3m2 45m2

Inclina7onAngle 20 37

Concentra7on 1.15 1.4

#ofTroughs 160 60

Capacity@200oC 20kW 18kW

CoolingCapacity 6.6tons,23kW

CWStorage 500gallons

COP 1.1

BroadDoubleEffectLiBrAbsorp4onChiller§  DualFired(naturalgasbackup)§  LiBr(absorbant)+H20(refrigerant)pair§  Doubleeffect(2stage)requires140°C§  COP~1.1(coolingprovidedperheat)

This project has beenopera4ng for 6 yearsnow&coun4ng.Contact:[email protected]

Recently, solar cooling has regainedthe research interest due todevelopment of solar collectors andthe availability of hot water drivenchi l lers which wel l match forsta7onary solar collectors withtemperature range 80-160oC. Tripleeffect chillers, which can poten7allyreach a COP of 1.7 with drivingtemperatures above 160 °C, are s7llunderdevelopment.