What pre-sizing and pricing ratio could be taken into account for a DUO collective project?
For engineering firms and energy specialists working on collective building projects in the competition phase, we recommend using our ‘quick ratios’ to size and cost the hybrid solar component using our Dualsun SPRING panels.
If you are in the preliminary design, detailed design or project design phase, please contact us directly for a more detailed study or specifications by filling in one of the forms available on the Specifier Area link, or by contacting your usual project contact person.
These ratios provide quick figures during the competition phase, but they are not a substitute for a preliminary study or costing by a competent installer. The characteristics of an individual residential project will not follow these ratios.
Ratio tables:
Estimated size (panel surface area) | BOOST | Heliopacsystem+ | DUO : Pre-Heating DHW | DUO : pressured swimming pool |
Panel surface area Dualsun | 0,5 m² to 1,5 m²/kW HP | 4 à 6 m²/ kW HP | 2 m² for 50 to 100 L/ DHW needs at 60°C | 1 to 2 m²/m² of swimming pool |
Map showing the relevant installation areas for our collective offers
*The grey areas above correspond to areas where thermal performance is not economically viable in relation to the estimated investment cost for a collective project (standard conditions)
A more detailed study can be carried out to examine the system's performance based on specific assumptions.
Table showing investment and maintenance ratios for solar installations based on installation size
How to read this graph ?
To obtain 2x more energy from a SPRING DUO installation compared to a PV installation, it is necessary to install 1 panel for every 150 L DHW needed per day. This means an average of 1 SPRING DUO panel per flat.
We recommend to install one panel for 60 to 100 L of DHW/day
Quick sizing for multi-units dwelling
Logements | SPRING DUO / flat | Surface (m²) |
T1 | 0.5 | 1 m² |
T2 | 0.75 | 1.5 m² |
T3 | 1 | 2 m² |
T4 | 1.25 | 2.5 m² |
Solar coverage rate
Maintaining the ratio of 1 panel for every 60 to 100 litres of DHW consumption per day, we obtain the following data:
*The electricity coverage rate corresponds to the self-production considered for the electrical backup. Part of the DHW generator's consumption is reduced thanks to the heat input from the hybrid panels, and another part is reduced thanks to the self-consumption of the electricity produced.
The electricity coverage rate varies greatly depending on the electrical generator in question: air/water heat pump or electric resistance.
Performance of a DUO Collective installation: Pressurised swimming pool (100L/h/panel)
A dimensioning ratio of 0.5 panels/m² of pool in the south and 1 panel/m² of pool in the north can be considered.
Given that temperatures between 30 and 45°C circulate in hybrid panels in summer, these ratios are not exhaustive. It should be noted that the panels deliver an average power of 500 to 800 Wth.
How to read this graph?
If we consider maximum irradiation of G=1000W/m² and the panel inlet temperature is equal to the air temperature (Tin - Tair = 0°C), then the outlet temperature will be Tout-Tin = 11°C
The higher the panel inlet temperature relative to the air temperature (deltaT abscissa), the less the outlet temperature will increase in degrees (deltaT ordinates).
P2: Labour for operation and maintenance. This includes:
Cleaning and routine maintenance of facilities
Operation, monitoring and adjustment of various equipment
Annual preventive maintenance
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