| Symbol | Quantity |
| Аsi QT Fi QI Qs Qa ei Kij εHij qS qE qSB Ci Qdiss | Absorptivity factor (node [-] Earth infra-red [W/m2] Area (node i) [m2] Heat rejection (node i) Incident sun flux [W/m2] Solar albedo [W/m2] Emissivity factor [-] Heat transfer by conduction [W/K] Heat transfer by radiation [m2] Incident Solar flux and albedo [W/m2] Earth infra-red (IR) [W/m2] Solar Cells flux [W/m2] Thermal capacitance (node i) [J/K] Heat rejection from equipment [W] |
| σ0 | Stefan-Boltzmann constant [=5.67 × 10−8 W/m2/K4] |