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Experience from PV system performance (including comparison of on-roof and façade systems in Prague)

Experience from PV system performance (including comparison of on-roof and façade systems in Prague). V i t e zslav Benda, Zdenek Machacek CTU Prague, Faculty of Electrical Engineering. radiation. temperature. datalogger.

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Experience from PV system performance (including comparison of on-roof and façade systems in Prague)

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  1. Experience from PV system performance (including comparison of on-roof and façade systems in Prague) Vitezslav Benda, Zdenek Machacek CTU Prague, Faculty of Electrical Engineering

  2. radiation temperature datalogger In the year 2001, a 3kWp demonstration, on-grid connected photovoltaic system has been built at the Czech Technical University in Prague on the roof of the Faculty of Electrical Engineering.

  3. In the year 2001, a 3kWp demonstration, on-grid connected photovoltaic system has been built at the Czech Technical University in Prague on the roof of the Faculty of Electrical Engineering.

  4. Installed peak power: 3320 Wp Total module area:26 m2 Number of modules:30 (3 fields of 10) Latitude: 50.07 °N Altitude: 205 m http://k313.feld.cvut.cz/solarsys/

  5. Parameters of PV modules at radiation power 1000W/m2, spectrum AM 1,5 and temperature 25°C Parameters of individual PV fields

  6. Parameters of Sunrise inverters

  7. A comparison of estimated and measured energy production in period from January 2002 to December 2005

  8. Energy produced by individual PV fields in period from January 2002 to December 2005

  9. Temperature dependence of energy conversion efficiency This gives the efficiency decrease of about 0.6% per 1K, which is higher than supposed decrease of cell efficiency (about 0.4% per 1K). It means that an increase of losses with increasing temperature in other parts of system cannot be neglected.

  10. August January

  11. Temperature distribution over the PV field areas June, ambient temperature 32 °C Tilt angle: 45° roof Tilt angle: 90° facade

  12. Temperature distribution over the PV field areas December, ambient temperature -6 °C roof

  13. Shadowing effect PV field 1 PV field 2

  14. Conclusions • Facade PV system applications can produce about 66% of electrical energy produced by the roof (45° tilted) one • Efficiency of PV systems is strongly influenced by temperature • PV field constructions should allow an effective cooling of PV modules

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