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Récepteur de prévisions météorologiques Meteodata 139 EFR KNX
Version : juin-13 (sous réserve de modifications) Page 51 sur 54
Ordres de grandeur :
1 kWh est la quantité d'énergie nécessaire pour réchauffer :
10 litres d'eau d’environ. 86 K
100 litres d'eau d’environ 8,6 K
1 000 litres d'eau d’environ 0,86 K
avec un rendement théorique de 100 %.
Important :
Le rayonnement solaire désigne la puissance calorifique qui peut impacter la surface d'un
capteur solaire orienté perpendiculairement par rapport au soleil.
Dans la pratique, seule une partie de cette énergie peut être exploitée :
L'énergie effectivement exploitable dépend des pertes dues à la position de montage des
capteurs (orientation, encrassement, ombres...) et du rendement de l'installation.
Des capteurs solaires thermiques peuvent, en fonction du modèle, atteindre un rendement de 60
- 75 % (source : Wikipedia).
Exemple : pour un rayonnement solaire de 600 W/m
2
et un rendement de 75 %, on obtient une
puissance calorifique de 0,75 * 600 W/m
2
= 450 W/m
2
au niveau du capteur solaire.
51


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