Deliverables
A prototype solar energy operational chain is running at Oldenburg University. A stepwise-integration in the day-to-day operation is ongoing.
The solar energy operational chain is a routine processing chain for solar energy specific data and consists of:
- hardware and software for the reception of MSG data at Oldenburg University
- back-up mechanism for MSG images in co-ordination with DLR
- new Heliosat-3 software and processing chain for the use of MSG data
- semi-automated data exchange.
The processing chain may be used to produce:
- near real-time values of solar irradiance for specific locations and/or regions
- time series of solar irradiance for specific locations
- maps of solar irradiance for specific time intervals.
Heliosat-3 provides an operational irradiance scheme on the basis of Meteosat Second Generation data.
The operational scheme consists of the new SOLIS clear sky scheme using climatological atmospheric data as input, an MSG-adapted and improved cloud index scheme and a new all-weather scheme.
The scheme provides spectrally resolved horizontal global and diffuse irradiance data with a spatial resolution of 1km x 1km (nadir) and a temporal resolution of 15 minutes.
The clear sky scheme is based on radiative transfer modelling and provides spectrally resolved global and direct clear sky irradiance. It requires information on aerosol, water vapour and ozone content of the atmosphere as input. In the current operational scheme climatological data are used. However, (near) real time data can be easily included.
New algorithms for the cloud index method have been developed: A correction for cloud shadings, a new technique to determine cloud reflectivity based on radiative transfer modeling and a new statistical approach to determine the ground reflectivity.
The all-weather module includes a model for diffuse irradiance that uses the now available clear sky direct irradiance as input. Furthermore a lookup table is used to correct the spectral distribution of the clear sky irradiance in the presence of clouds.
The SOLIS clear sky module delivers the previously not available clear sky irradiance. A newly developed algorithm for the all-weather direct irradiance exploits this new information. The new model significantly reduces the mean bias error (MBE) of direct and diffuse irradiance.
The new scheme provides spectrally resolved clear sky and all weather irradiance. Filter for the spectral response of the human eye (luminance), plants (PAR) and solar cells have been integrated in the software. Additional filters can be defined by the user.
The SoDa service (www.soda-is.com) has been developed in the framework of the project SoDa ("Integration and exploitation of networked Solar radiation Databases for environment monitoring"), supported by the European Commission, contract IST-1999-12245. The project began on January 1, 2000 and ended in March 2003. Since January 2003, the SoDa Service is an operational service.
The SoDa Service offers a one-stop access to large sets of data, databases, applications and other information relating to solar radiation and its use in various domains such as energy production, building engineering and architecture, meteorology, climate, air quality, photosynthesis (PAR), human health, UV radiation, materials.
The SoDa web interface has been extended to integrate the climatological operational chain at Ecole des Mines (Helioclim-2). A stepwise-integration of the complete Heliosat-3 method is ongoing. DLR provided a web access for the cloud and atmospheric data products to the consortium. Oldenburg University provided a web access for the irradiance products to the consortium.
Applications which are oriented towards long-term irradiance data with an emphasis on climatology-related topics (long-term time series, GIS, cartography) are best suited to the climatological processing chain.
The climatological processing chain aims at the routine processing of MSG data with emphasis on climate research and atmospheric applications. Its major characteristics are:
- integration of retrieval data and basic MSG data
- conditioned processing system (look-up tables etc.)
- intelligent mechanisms for effective and user-friendly access to results
- different product levels (primary, secondary, �) according to customer needs
The climatological chain can
- process MSG data efficiently
- run very fast, every 15 minutes
- operate also off-line.
A hybrid climatological operational chain (Helioclim-2) has been running at Ecole des Mines since February 2004. The Helioclim-2 chain has been integrated in the SoDa service. A stepwise integration of the complete Heliosat-3 method in ongoing.
Helioclim is a climatological database of irradiance data run by the Centre Energtique et Procds of Ecole des Mines de Paris. The data are accessible via the SoDa service.
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