Usually the solar panel is filled with glycol. Glycol has a lower heat capacity than water.
The correction factors of the heat power and energy are given in the next table:
Table 7. Correction factors for heat power and energy for water meters
Glycol concentration |
Heat capacity of the solar fluid |
Correction factor for solar power and energy |
POW-01 = 0 |
POW-02 = 0 |
Psolar = Pwater * 1 |
POW-01 > 0 |
POW-02 = 0 |
Psolar = Pwater * (POW-01 * CFglycol+(100 - POW-01)*CFwater)/100 CFglycol = POW-03 heat capacity of glycol |
POW-01 = 0 |
POW-02 > 0 |
Psolar = Pwater * POW-02/4,187 (dependends on temperature) |
POW-01 > 0 |
POW-02 > 0 |
Psolar = Pwater * POW-02/4,187 |
Psolar is the solar power; Pwater is the heating power of the external meter.
Cwater = 4,187 kJ/(kg·K) heat capacity water
The heat energy is the value connected at the input “TotSolEnergyIn” and is multiplied by the same correction factors as the heat power and displayed at the output “TotSolEnergy”.
Table 8. Parameter List
Description |
Value Range |
Default Value |
Unit |
CFG-01: solar power calculation 0; 1 = using a flow signal 2 = external heat meters |
0.. 2 |
1 |
1 |
POW-01: collector glycol concentration |
0…100 |
50 |
% |
POW-02: collector fluid heat capacity – cF |
0…120 |
0 |
kJ/(kg·K) |
POW-03: glycol heat capacity at 0 °C |
0…120 |
2,277 |
kJ/(kg·K) |
CO2-01: kg of CO2 saved per kWh of fuel |
0,00000...1,00000 |
0,310 |
Kg/ kWh |