Diurnal/Hexadiurnal Heat Capacity

• Thermal behavior of a house is a dynamic process
• Look at harmonics of response:
  • daily (diurnal)
  • weekly (hexadiurnal)

Define a "diurnal heat capacity" of a material:

dhc = Heat stored during the day and delivered after 6pm, per unit area, per unit degree

DHC = S dhc_i A_i

_Then,

DT (swing) = .61 Q_solar / DHC