1. 1 05-March-2014 BE-RF-PM Calculations of the heat transfer coefficients for the TM0

2. 2 05-March-2014 BE-RF-PM SAS : Heat Transfer Coefficient due to Convection SAS NATURAL-FREE CONVECTION Where g = gravitational acceleration m/s² β = coefficient of the volume expansion, ρω-ρ/ρ(Τω-Τ) Ts = temperature of the surface, °C Tω= temperature of the fluid sufficiently far from the surface, °C Lc = characteristic length of the geometry, m v = kinematic viscosity m²/s AIR properties k0.0257W/mK ρ1.205 kg/m 3 v1.5E-05 m2/s µ1.8E-05 CpCp 1005J/kgK Pr0.7 T∞T∞ 20 °C u ∞ (Nominal value) 0.7m/s For an horizontal plate the formula above is: for FORCED CONVECTION with For turbulent flow over the entire plate : L= 2 m

3. 3 05-March-2014 BE-RF-PM 3 NATURAL-FREE CONVECTION Where g = gravitational acceleration m/s² β = coefficient of the volume expansion, ρω-ρ/ρ(Τω-Τ) Ts = temperature of the surface, °C Tω= temperature of the fluid sufficiently far from the surface, °C Lc = characteristic length of the geometry, m v = kinematic viscosity m²/s FORCED CONVECTION AIR properties k0.0257W/mK ρ1.205 kg/m 3 v1.5E-05 m2/s µ1.8E-05 CpCp 1005J/kgK Pr0.7 T∞T∞ 20 °C u ∞ (Nominal value) 0.7m/s PETS : Heat Transfer Coefficient due to Convection with 2 x 2 m

4. 4 05-March-2014 BE-RF-PM SAS, PETS: Mixed Convection -Values 4 Nu natural Nu forced Nu mixed h SAS3.51e21.14e23.52e25.09 PETS19.33.09e2 3.97

5. 5 05-March-2014 BE-RF-PM SAS, PETS : Heat transfer coefficient due to Radiation 5 Emissivity ε 1 Stefan-Boltzmann constantσ5.67E-08 W m -2 K -4 Module surface temperature TsTs 30 °C 303K Surrounding temperature (wall) T sur 2040 °C 293313K Heat transfer coefficient hrhr 6.06.6 W/(m 2 K)