1. © DualSun - 2015 – Thermal performance study of DualSun installations by Transénergie Thermal performance analysis of two DualSun installations 1

2. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 2 Objective of the study Project definition: Study realized over 9 months (April – December 2014) by the engineering firm Transénergie, specialized in renewable energies and energy management for more than 22 years.Transénergie Objective of the study: Mesure the temperature of the DualSun panels, as well as the solar energy provided for the domestic hot water. The study is specifically focused on thermal production. Method used: Monitoring system installed by Transénergie, installation realized by professional installers, analysis by Transénergie.

3. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 3 The monitored installations The two installations are located in the Lyon region which is representative of an average climate in France The 1 st installation is “building- integrated”, while the 2 nd installation is not (with non-insulated panels): this allows us to measure the impact of building-integration on the thermal performance.

4. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 4 Conclusions of the study 1.The measured results are very close to the estimated results conducted with the DualSys platform (see next slide), 2.The DualSun panels allow a “quasi-autonomy” with respect to hot water needs during the summer and inter-season months (spring / fall), 3.During the hottest months, the panels never exceed 70°C, thus there is no risk for overheating with the DualSun panels.

5. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 5 DualSys is the 1st web-based hybrid solar simulator: the platform allows the user to precisely estimate the hot water and electricity production of a DualSun installation (based on geography, rooftop orientation, number of panels, etc.). DualSys also provides a personalized report that can later on be used to compare measured results of the installation (via an adapted monitoring system). The DualSys platform

6. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 6 Installation 1: Building-integrated Description of system: 6 DualSun panels, South-west facing (20°/ South), Tilt angle of 30°, Building-integrated (EASY ROOF mounting system), 300L hot water tank for 4 people, Natural gas boiler. For more information, a detailed description of this installation is available on our website.website

7. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 7 The solar coverage is the ratio of energy provided by the solar panels for the hot water compared to total hot water needs. The measured results are very close to DualSys estimations (3.5% error). The major gap in July is explained by a particularly cold and rainy summer 2014 in France. http://www.meteofrance.fr/climat-passe-et-futur/bilans-climatiques/bilan-2014/bilan-climatique-de-l-ete# Installation 1: Solar coverage Measured

8. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 8 During the summer (from June to September) DualSun allows a “quasi- autonomy” in terms of hot water needs with a solar coverage of 94%. % Installation 1: Autonomy in the summer

9. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 9 Max at 68°C Installation 1: Maximum temperatures The maximum temperature reached in the panels is 68°C : there is therefore no risk of overheating in the panels.

10. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 10 Installation 2: Surface mounting system Description of system 4 DualSun panels, South-west facing (50° / South), Tilt angle of 20°, Installation with surface mounting system, 200 L hot water tank for 2 people, Natural gas boiler for booster. For more information, a detailed description of this installation is available on our website.website

11. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 11 The solar coverage is the ratio of energy provided by the solar panels for the hot water compared to total hot water needs. The measured results are very close to DualSys estimations (4% error). * The major gap in July is explained by a particularly cold and rainy summer 2014 in France. http://www.meteofrance.fr/climat-passe-et-futur/bilans-climatiques/bilan-2014/bilan-climatique-de-l-ete# Installation 2: Solar coverage * Measured

12. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 12 During the summer (from June to September) DualSun allows a “quasi- autonomy” in terms of hot water needs with a solar coverage of 90%. % Installation 2: Autonomy in the summer * * The major gap in July is explained by a particularly cold and rainy summer 2014 in France. http://www.meteofrance.fr/climat-passe-et-futur/bilans-climatiques/bilan-2014/bilan-climatique-de-l-ete#

13. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 13 Max at 67°C Installation 2: Maximum temperatures The maximum temperature reached in the panels is 67°C : there is therefore no risk of overheating in the panels.

14. © DualSun – 2015 – Thermal performance study of DualSun installations by Transénergie 14 How to calculate the energy provided by the panels and by the booster. Solar = A * Débit * (T3-T1) Booster = A * Débit * (T4-T3) The constant A is the Cp (Capacité calorifique de l'eau) x volumic mass x le pas de temps d'acquisition du débitmètre / 3600. Solar coverage = Solar / (Solar + Booster) 1’ ’ T2 T3 T1 T4 Débit Solar regulatio n T1 is the temperature of the water source (cold) of the tank that then passes to the DualSun panels. T2 is the temperature of the water at the output of the DualSun panels. T3 is the temperature of the water at the output of the tank, exclusively heated by the solar panels. T4 is the temperature of the water at the output of the boiler. Le débitmètre mesure le débit de consommation d’eau. All material used is from the RESOL brand. Hydraulic schematic of a DualSun installation with a boiler booster. Installed sensors and measures taken

15. © DualSun - 2015 – Thermal performance study of DualSun installations by Transénergie Please contact us if you would like further information about this study or the performance of our installations: www.dualsun.fr www.dualsun.fr contact@dualsun.fr www.transenergie.eu sun@transenergie.eu