Jean-Louis Canaletti

Utilization of meteosat satellite-derived radiation data for integration of autonomous photovoltaic solar energy systems in remote areas

Due to the importance of the relief of Corsica, striking contrasts occur and turn a coastal Mediterranean climate on the littoral into an alpine one in the high mountains. Firstly, we demonstrate, computing a spatial correlogram, that for such countries it is not possible to deduce the solar irradiation received on any part of the island from the meteorological network. Consequently, satellites offer a good alternative for determining these solar data. We demonstrate a good accordance between daily solar irradiation values estimated from Meteosat satellite data and measured data on the considered sites. From the previous data of daily horizontal total irradiations, hourly total irradiations on tilted planes have been computed. These data have been used in an optimal sizing method of PV system, easily applicable to any site. So, for each site on the island of Corsica, we can determine the best adapted PV system, and we analyse differences between sizing characteristics according to the site of installation. Lastly, we have shown very good accordance between sizing results calculated, on the one hand, from measured irradiation hourly data and, on the other hand, from daily satellite images.

Patented twintex® hybrid PV/T collector: Level of performances and comparison with thermal solar collector

In the context of climate change in the world at the global level, various actions are taken for the development of Renewable Energy and particularly solar energy. Many technology solutions have been proposed such as solar hybrid collector whose objectives is to improve the PV panels performance by recovering heat looses with the heat removal fluid. The objectives of this article is to propose a hybrid photovoltaic-thermal collector manufactured in a polymer material twintex® patented by Saint-Gobin company, to have product lighter, cheaper and easier to handle. We expose the performance of this PV-T collector manufactured without air layer.

Performance improvement of a BIST water collector: a parametric study

A flat-plate solar collector with high building integration was designed and prototyped. The experimentations showed that the performances of this solar collector can be improved. A numerical thermal model, developed in Matlab® environment using a finite difference model, was validated. Then, a modelling of the complete solar domestic hot water system (solar collector + water storage + piping) was realized. The performance of this system was calculated for various solar collector configurations such as the number and the position of the water pipes, air layer thickness, fluid flow rate, etc. Several solar fractions were used to implement this optimization procedure. An optimized solar collector structure is finally presented.

CALCULATION OF THE OPTIMAL ABSORBER POSITION FOR A LOW CONCENTRATED SOLAR SYSTEM

We developed a hybrid solar system using several mirrored surfaces focusing (with an one-axis concentration) the solar radiation on an absorber in view to reach a fluid temperature around 150°C. The objective of this work is to determine the optimal position of the absorber-receiver for a maximal heat production: the height above ground and the width of the absorber for a given distance between the receiver and the mirror structure. The precision on the rotating angle for the mirror is also calculated. We obtained an optimal absorber height above the ground of 66 cm, a width of the absorber of 15 cm and a precision of the rotating angle of 0.1°.

An Example of a Cluster to Develop Projects in the Field of Energy in France: Capenergies

Business clusters consist of economic structures assuring the often tenuous link between research regarding efficient national industrial policies, and regional planning and territorial anchoring issues. From this perspective, the logic of a synergy relating to global and local issues remains to be created around a new imperative: territorial attractiveness. In the era of globalization, and the current configuration of globalization, the concept of attractiveness, sometimes overused in the economic literature, is a crucial issue for regions competing over geographically mobile investments. In this context, the issue of promoting and attracting investments reflects a multidimensional dynamic in which the existence of business clusters is of great importance. Corsica, a small island economy, represents a typical target of analysis with respect to its long-standing project PADDUC (Corsica decentralization law of January 2002) and the business cluster CAPENERGIES an important part of its technological research, the clearly pronounced goal of which consists of entrusting to it the role of leader of the islands involved in the movement toward autonomy in decentralized energy. The presents work seeks to identify the specificities of a territorial governance to be established around the business cluster CAPENERGIES from the perspective of the construction of a plan for ongoing island attractiveness, currently in search of a foundation.

A New Energy Concept to Minimize Electricity Consumption in Industry or Buildings

A new concept of flat plate solar collector is presented: its originality comes from its remarkable shape and from its integration into a rainwater gutter. The complete solar collector consists in several short modules connected serially. After a brief presentation of the building energy problem, the new patented solar collector is described and the two thermal experimentations are shown. A numerical model is developed in Matlab® 15 environment using a finite difference model and an electrical analogy. At last, the thermal model is validated from experimental data under various meteorological situations. The adequacy of the model with the experimental data is shown for various temperatures inside the solar collector and for the water temperatures.

New Design for a Solar Concentrator with Rotating Slats

From a promising first study performed on a reflecting slats solar concentrator, we propose to improve and optimize the design by providing a number of additional functions related to technological progress in the field of solar energy and electrical engineering. In order to satisfy a need for a specific production of heat around 150°C, the original system is equipped with an anti- radiation structure boiler and a more efficient control to improve and regulate the production of heat. Taking advantage of these technical improvements, photovoltaic cells are added behind slats for a stand-alone function and a possible connection to the grid (Figure 1). This new approach of solar concentration with hybrid PV/Th is being studied with an experimental system designed by our research laboratory.

MODELLING OF A STAND ALONE SOLAR COLLECTOR

The work described in this paper concerns the modelling of a standalone air solar collector producing low temperature heat. The main role of the system is to avoid unfreezing temperatures and to reduce humidity in a room or in an unoccupied home during a long time, with only solar radiation. In view to dispose an essential sizing tool for this solar collector, we developed a mathematical model based on energy balance equations and on the characteristics of each prototype. This model allowing to simulate the thermal behaviour of the solar collector, was validated using experimental data collected by telemetry in six operating sites.

H2OSS®: THERMAL SOLAR COLLECTOR WITH A HIGHT BUILDING INTEGRATION

A new concept of flat plate solar collector is presented: its originality comes from its remarkable shape and from its integration into a rainwater gutter. The complete solar collector consists in several short modules connected serially. After a brief presentation of the building energy problem, the new patented solar collector is described and the two thermal experimentations are shown. A numerical model is developed in Matlab® 15 environment using a finite difference model and an electrical analogy. At last, the thermal model is validated from experimental data under various meteorological situations. The adequacy of the model with the experimental data is shown for various temperatures inside the solar collector and for the water temperatures.

A new approach for designing a hybrid solar concentrator

From a promising first study performed on a reflecting flats solar concentrator, we propose to improve and optimize the design by providing a number of additional functions related to technological progress in the field of energy solar and electrical engineering. In order to satisfy a need for a specific production of heat around 150°C, the original system is equipped with an anti-radiation structure boiler and a more efficient control to improve and regulate the production of heat. Taking advantage of these technical improvements, photovoltaic cells are added behind flats for a stand-alone function and a possible connection to the grid (Fig 1). This new approach of solar concentration with hybrid PV/Th is studied with an experimental system built in our research laboratory.