| Conduction | Qcond=ΔQ/Δt= k26.68°C＊A＊ΔT/L (1) | 0.10W (0.84%) | 0.10W (0.8%) | 0.12W (0.67%) |
| k25°C : thermal conductivity of atmosphere at 25°C (Concrete : 1.6 W/m•K, Brick : 0.96 W/m•K, Wood(Fir) : 0.12 W/m•K) |
| A : total cross sectional area of conducting surface (m2) |
| ΔT : temperature difference (°C) |
| L : length of conducting surface (m) |
| Convection | Qconv=hconv＊Asurf＊ΔT (2) | 3.38W (28.43%) | 2.98W (23.84%) | 4.52W (25.06%) |
| hconv : convection heat transfer coefficient |
| Asurf : surface area (m2) |
| ΔT : temperature difference (°C) |
| Radiation | Qradi=σ * ε * Asurf * (T14-T24) (3) | 8.41W (70.73%) | 9.42W (75.36%) | 13.4W (74.27%) |
| σ : Stefan-Boltzman constant (5.669×10-8) |
| ε : emissivity of materials (cement : 0.94, brick : 0.93, Wood (Fir) : 0.90) |
| Asurf : surface area (m2) |
| T1 , T2 : temperature of two bodies (°C) |
| Total | 11.89W (100%) | 12.5W (100%) | 18.04W (100%) |
| Efficiency | 21.62% | 22.73% | 32.8% |