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PV COOLING SYSTEMS

PV COOLING SYSTEMS. DESIGN, REALISATION, TESTS, COMPARATIVE ANALYSIS OF LOW ELECTRIC CONSUMPTION PV COOLING SYSTEMS COSTIC Comité Scientifique et Technique des Industries Climatiques Eric MICHEL Enerbuild Participant number : 37. PROJECT PARTNERS. COSTIC - France Technical co-ordinator

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PV COOLING SYSTEMS

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  1. PV COOLING SYSTEMS DESIGN, REALISATION, TESTS, COMPARATIVE ANALYSIS OF LOW ELECTRIC CONSUMPTION PV COOLING SYSTEMS COSTIC Comité Scientifique et Technique des Industries Climatiques Eric MICHEL Enerbuild Participant number : 37

  2. PROJECT PARTNERS COSTIC - France Technical co-ordinator EUREC - Belgium Administrative co-ordinator ALPES FROID - France Manufacturer of prototypes UNIVERSITY OF ATHENS - Greece Modelling and testing of the buried pipes prototype CIEMAT - Spain Modelling and testing of the evaporative air cooler prototype APEX - France Manufacturer of PV generator

  3. PROJECT OBJECTIVE To develop two low electric consumption cooling systems for small or medium buildings well adapted for photovoltaic with ratio of performance (Frigorific power/Electrical power) higher than 20 : • PV buried pipes system • PV evaporative air cooler system Type of buildings : • Surface : from 50 to 250 m² • Tertiary sector - little and medium dwelling

  4. PV Buried pipes system PV Evaporative air cooler system Adapted for a hot and wet or dry climate Adapted for a hot and dry climate TWO SYSTEMS STUDIED

  5. BACKGROUND • Existing cooling systems : • Conventional heat pump with ratio of performance (Frigorific power/Electrical power) about 2 to 3 • Systems like buried pipes and evaporative air cooler have been tested in the case of application in 220 V A.C (with ratio about 6 to 10) but are not well adapted for photovoltaïc.

  6. PROGRAMME OF THE PROJECT • The programme of this research project has been the following one : • Definition of needs • Design of air cooling devices • Manufacturing of prototypes • Tests of prototypes in laboratory • Experimental study of prototypes under real conditions of use • Analysis and comparison of different systems • Synthesis

  7. Pf/Pe Inlet temperature [°C] Outlet temperature [°C] Ground temperature [°C] 14,7 30 20 18 20,8 35 20 18 27 40 20 18 TESTS IN LABORATORY : Performance for an installation of three buried pipes WITH AIR FLOW [1100 m³/h] AND FAN POWER 245 [W] Pf = Frigorific power Pe = Electric power

  8. TESTS UNDER REAL CONDITIONS PV buried pipes tested in Athens Main results concerning all cooling season : Average ratio : Pf/Pe = 18 Maximum ratio : Pf/Pe = 35

  9. OPTIMAL DATA FOR A BURIED PIPES INSTALLATION

  10. PV BURIED PIPES COUPLED WITH OFFICE BUILDING IN MADRID (60M²) + : Indoor temperature with cooling x : Indoor temperature without cooling  : Outdoor temperature PV surface : 5 m2 ; 500 Wp Pipe number : 3 Lenght pipe : 50 m

  11. DETERMINATION OF THE BURIED PIPE SIZING AND THE PV SUPPLY

  12. PRINCIPLE OF PV EVAPORATIVE AIR COOLER 1 2 3 4 1 : Heat and dry air 2 : Cool and wet air 3 : Humidification plate 5 6 4 : Fan 5 : Storage water 6 : Water pump

  13. TESTS IN LABORATORY : Performance for an installation of evaporative air cooler Outside air température = 40°C ; Hygrometry = 25%

  14. TESTS UNDER REAL CONDITIONS PV evaporative air cooler tested in Madrid Main results for a sunny day in August : Average ratio : Pf/Pe = 43 Maximum ratio : Pf/Pe = 110

  15. DETERMINATION OF THE EVAPORATIVE AIR COOLER SIZING AND THE PV SUPPLY

  16. CONCLUSION • These cooling techniques can be used in developing countries and Mediterranean countries. • With these systems, it could be possible to cool premises such as little office buildings or dwellings. The ratio of performance can exceed the value of 20. • A financial study showed that investmentcosts of conventional systems compared to the investment costs of the new devices developed during the programme are rather equal

  17. CONCLUSION • Along the hot season, these systems only allow to reduce the temperature inside the premises of 3 to 4 K compared to the situation without any conventional air conditioning systems. For instance in the south of France it is possible to reach the comfort conditions during about 80 to 90 % of summer. • Proposition of an accompanying measure to achieve demonstration programme and design guidelines

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