Comparison of different bifacial systems - nPV...

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Comparison of different bifacial systems Design parameters influence analysis Prof. Naftali Eisenberg Dr. Lev Kreinin BIFI Workshop KONSTANZ October 2017

Transcript of Comparison of different bifacial systems - nPV...

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Comparison of different bifacial systems

Design parameters influence analysis

Prof. Naftali Eisenberg

Dr. Lev Kreinin

BIFI Workshop KONSTANZ October 2017

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OUTLINE

1. Introduction-Definitions

2. Bifacial Space Systems

3. Design Factors for Terrestrial Bifacial Arrays

4. Experimental Analysis of Design Factors

5. System Test Results

6. Conclusions

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1. Introduction-Definitions

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MODULE GAIN, BIFACIAL FACTOR AND EQUIVALENT EFFICIENCY

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2. Bifacial Space Systems

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BIFACIAL SYSTEMS in SPACE

Bifacial Factor: 75 %

DESIGN PARAMETERS: HEIGHT OF ORBIT ORBIT INCLINATION RELATIVE TO EQUATORIAL PLANE

EARTH ALBEDO MODULE ORIENTATION

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BIFACIAL SYSTEMS in SPACE

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3. Design Factors For Terrestrial Bifacial Arrays

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1. ILLUMINATION CONDITIONS

Sun elevation

Diffused/global radiation ratio

2. MODULE AND SYSTEM PARAMETERS

Bifaciality Factor

Module inclination (tilt)

Distance between rows

Module elevation above underlying surface

Distance between modules in the row

Albedo of underlying surface

DESIGN FACTORS AFFECTING THE BACK CONTRIBUTION IN TERRESTRIAL BIFACIAL SYSTEMS

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4. Experimental Analysis of Design Factors

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Measured back side irradiance for a 30o tilted stand alone module

Albedo: 0.55

Global Irradiation: 1006 W/m2

Diffuse Irradiation: 111 W/m2

Panel size: 80x160 cm2

NON UNIFORMITY OF BACK IRRADIANCE VS. PANEL ELEVATION

INFLUENCE OF PANEL ELEVATION ON BACK IRRADIANCE

Elevation 108 cm Elevation 8 cm

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INFLUENCE OF PANEL ELEVATION ON GAIN

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INFLUENCE OF WEATHER CONDITIONS ON GAIN

HOURLY DEPENDANCE OF ENERGY OUTPUT FOR MONO AND BIFACIAL MODULES IN A FIELD

Monitoring for sunny day with diffused/global radiation ratio: 11 % at noon

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INFLUENCE OF WEATHER CONDITIONS ON GAIN HOURLY DEPENDANCE OF ENERGY OUTPUT FOR MONO AND BIFACIAL MODULES IN A FIELD

Monitoring for cloudy day with diffused/global radiation ratio: 88 % at noon

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INFLUENCE OF ALBEDO AND WEATHER ON BACK IRRADIANCE

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5. System Test Results

Annual Bifacial Gain and Equivalent Cell Efficiency for various Field Designs Simulated vs. Measured Results

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Test field monitored by Fraunhofer ISE

ROOFTOP TEST FIELD IN GEILENKIRCHEN/GERMANY

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TEST FIELD LAYOUTS

ROOFTOP TEST FIELD IN GEILENKIRCHEN/GERMANY

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ROOFTOP TEST FIELD IN GEILENKIRCHEN/GERMANY

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Confidential & Proprietary

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ROOFTOP TEST FIELD IN GEILENKIRCHEN/GERMANY

Electric Gain and Equivalent Efficiency Simulation North Germany

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Confidential & Proprietary 21

ROOFTOP TEST IN JERUSALEM/ISRAEL

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ROOFTOP TEST IN JERUSALEM/ISRAEL

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ROOFTOP TEST IN JERUSALEM/ISRAEL

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6. CONCLUSIONS

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THE MOST IMPORTANT PARAMETERS UNDER CONTROL ARE: Module Bifaciality Factor

Albedo of underlying surface The Height of the module is a critical factor too

CONCLUSIONS

CAREFUL DESIGN AND PARAMETERS CHOICE OF BOTH MODULES AND FIELD INSTALLATION WILL INSURE BIFACIALITY GAIN OF 30-40 %

BIFACIALITY GAIN PROVIDE ENERGY GENERATED DENSITY NOT ACHIEVABLE BY HIGHEST EFFICIENT MONO-FACIAL SILICON CELLS

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Prof. Naftali Eisenberg, CTO [email protected] Mobile: +972 54 7343468

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