How many Dualsun finned SPRING4 panels are necessary to provide heat to a ground source heat pump ?
We recommend the following sizing ratios depending on the heat pump technology and the lower temperature limit of its evaporator:
PAC technology | Low limit temperature at evaporator inlet [°C] | Base temperature [°C] | Sizing ratio [PVT/kW calo PAC B0/W35] | Number of SPRING for a 9kW Heat pump |
Inverter | ≤ -15°C | ≤ -10°C | 1,5 | 14 |
> -10°C | 1,3 | 12 | ||
≤ -10°C | ≤ -10°C | 1,7 | 16 | |
> -10°C | 1,5 | 14 | ||
On/Off | ≤ -15°C | ≤ -10°C | 1,6 | 15 |
> -10°C | 1,4 | 13 |
These ratios have been calculated to ensure the best compromise between the initial cost of the solar installation and the energy performance of the system, and may vary depending on the specific configuration of the installation.
The rule here is simple: the more panels used, the better the thermal performance of the heat pump. For example, if your sizing recommends 14 panels and the roof requires installation in 3 rows, it is preferable to install 15 panels to have 3 hydraulic fields of 5 panels each.
The sizing should be refined on a case-by-case basis, checking on the one hand that the solar thermal contribution of the hybrid panels is sufficient according to the data for your geographical area and, on the other hand, that the circulator integrated into the primary circuit of the heat pump is sufficient to circulate the heat transfer fluid in the hybrid panels.
To go further : Are Dualsun SPRING panels compatible with water-to-water heat pumps?