Solar Energy Engineering

C_b = effective thermal capacitance, i.e., mass times heat capacity (J/°C).

ΔT_b = the difference of upper and lower temperatures, i.e., the temperature range the building is allowed to float (°C).

The two limiting cases have Y values equal to 0 for the zero storage capacity building and infinity for the infinite storage capacity building. The values of the effective thermal capacitance, given by Barakat and Sander (1982), are equal to 60 kJ/m²-°C for light construction buildings, 153 kJ/m²-°C for medium construction buildings, 415 kJ/m²-°C for heavy construction buildings, and 810 kJ/m²-°C for very heavy construction buildings.

Finally, the correlation of the monthly solar fraction is given in terms of X, Y, and and is given by (Monsen et al., ...