Investigation of a Concentrating Photovoltaic Thermal Collector (CPVT) System Salim HADDAD1, K. TOUAFEK2 , I. TABET2 and Y. AMIRAT3 1LGMM Research Laboratory, Université 20 août 1955 Skikda, Algeria. 2 UREAR ,CDER Ghardaia, Algeria. 3 ISEN-Brest, CNRS FRE 3744 Institut de Recherche Dupuy de Lôme, France Contact : s.haddad@univ-skikda.dz

Where is SKIKDA ? Skikda I,m going to present my city skikda and excuse me for my bad english Algeria

Overview Introduction The PVT Model Conception and New Design of Concentrating Photovoltaic Thermal Collector (CPVT) Experimental Tests. Results and Discussions Conclusion

Introduction The overall problem with the use of photovoltaic (PV) system is the high cost of solar cells. This makes it attractive to concentrate irradiation on the PV module. With increased light concentration, there will be a demand for increased cooling of the PV cells in order to lower the working temperature. Hybrid photovoltaic/thermal (PVT) solar systems are less expensive devices than the two separate units which can simultaneously provide electricity and heat with higher conversion rates of the absorbed solar radiation than standard PV modules.

Introduction The solar hybrid photovoltaic thermal (PV / T) collector offer an interesting option now because the absorbed solar radiations are converted into thermal and electrical energy (the conversion may be performed separately or simultaneously). Hybrid solar collector (PVT) represents one of the principle means which is the most effective for the conversion of solar energy resources. Glass PV cells Absorber Isolation

The PV/T Conception The general basic concept of solar thermal hybrid solar PV/T has been studied by Kern and Russell in 1978. The PVT module can capture solar energy at different levels (wavelengths) and therefore leads to greater energy efficiency by : converted into electricity by the photovoltaic cells and, while the remaining irradiations are converted into the form of thermal energy.

The PV/T Model The overall yield is the sum of the thermal and electrical efficiency, which is defined as the ratios of system is useful heat gain and electricity to the incident solar radiation as follows :          

SHORT CIRCUIT CURRENT ISC OPEN CIRCUIT VOLTAGE VOC Conception and new design of new Concentrating Photovoltaic Thermal Collector (CPVT) The conception and the sizing of new Concentrating Photovoltaic Thermal Collector (CPVT) require the use of a conventional photovoltaic module , and building a air absorber in the rear of the module. we have used photovoltaic module mono-crystalline silicon UDTS 50 (Unit Development and Technology at Silicon) PARAMETER VALUE SHORT CIRCUIT CURRENT ISC 3.27 A OPEN CIRCUIT VOLTAGE VOC 21.6 A MAXIMUM CURRENT IMAX 2.87 A MAXIMUM VOLTAGE : UMAX 17.4 V MAXIMUM POWER PMAX 50±10%WP

Conception and new design of new Concentrating Photovoltaic Thermal Collector (CPVT) The obtained Concentrating PVT air collector has a new design of absorber. It is primarily made up of photovoltaic module of single crystal type UDES 50 and an absorber thickness 2 cm stuck below the photovoltaic module. A air-coolant can circulate inside this absorber and collects the heat emitted by the solar cell

Experimental Tests The three Compared Collectors at renewable research unit ghardaia –south of Algeria- we have installed four collectors ( two Concentrating Photovoltaic Thermal Collector (CPVT) and two PV classical collector) to compare their parameters in the same time.   The PVT collectors are directed according to the south with an angle of inclination is equal to the attitude of the place (32.39°).the reflectors putting on the upper and lower of hybrid photovoltaic thermal collector.

Experimental Tests we have taken the ambient temperature, temperatures of the front and back sides of the three collectors (the new CPVT, and the PV classic one), and temperatures of the input and output of the fluid in each five minutes. Agilent 34970 DATA Acquisition/Switch Unit.GPIB, RS232 Realized Variable Charge

THE MEASURED POINTS OF THE THERMOCOUPLE ON THE CPVT PANEL TEMPERATURE Experimental Tests THE MEASURED POINTS OF THE THERMOCOUPLE ON THE CPVT PANEL TEMPERATURE

the measured points of the thermocouple on the pv panel temperature Experimental Tests  

Experimental Results Measured Solar Irradiance and Ambiant Temperature  

Experimental Results Current voltage comparison between PV module and PVT Collector  

Experimental Results Hourly variation of temperature elements of PVT air collector without reflectors and PV panel . Testing in our prototype photovoltaic thermal collector and PV panel, where we measured the temperature of each element of the PVT collector and the PV panel,

Experimental Results Hourly variation of temperature elements of PVT air collector without refloctors.   Température of glass of photovoltaic panel (TavPV) higher compared to temperature of glass of PVT collector ((Tav PVT) , it tell us that the heat transferred by the PV panel absorbed by the upper plate.

Experimental Results Hourly variation of temperature elements of PVT air collector with refloctors and PV Panel.   In this case we place on the upper and lower hybrid thermal photovoltaic air collector reflectors in order to increase the quantity of solar radiation incident on the surface of collector we measured the same temperature as the first test,

Experimental Results Hourly variation of temperature elements of PVT air collector withrefloctors.   There is an increase in temperature of each element of the photovoltaic thermal collector with the presence of two reflectors

Experimental Results Comparison between Hourly variation of temperature elements of PVT air collector without and with Reflectors and PV Panel.   b. with reflectors a. without reflectors

Results discussion We note there is an increase in temperature of each element of the photovoltaic thermal collector with the presence of two reflectors. The role of reflector is very important to increase the solar radiation absorption by the PVT collector.  

Conclusions An experimental realization of a new Concentrating Photovoltaic Thermal Collector CPVT concept is presented Prototype of this collector has been achieved and tested in the URAER Ghardaia research center (Sahara-Algeria) The performances of this hybrid collector are compared to a thermal collector and a photovoltaic module. The obtained results represent good performances for the hybrid collectors in the point of view of both electrical and thermal production

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