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Passive Solar Thermal Mass Performance Calculator - Borst Engineering & Construction LLC
Design Indoor Dry Bulb Temp (Deg F)
Daily Irradiance Heat Gain (BTU/Day, from Passive Solar Heat Gain Calculator)
Average Daily Irradiance Time Period (Hours/Day, from Passive Solar Heat Gain Calculator)
Convection Heat Transfer Coefficient (BTU/Deg F-H-SF, Still Air is 1.56)
Thermal Mass Temp prior to Irradiance (Deg F)
Thermal Mass Area (SF)
Thermal Mass Thickness (Inches, 4-6 typical)
Thermal Mass Density (PCF, Concrete is 150)
Thermal Mass Specific Heat Capacity (BTU/Deg F-Lb, Concrete is 0.18)
Thermal Mass Insulation R-value (Deg F-H-SF/BTU, 2 Inch Thick EPS/XPS is 10)
Thermal Mass Absorptivity (%, Concrete is 60-80)
Thermal Mass Emissivity (%, Concrete is 85-95)
Total Heat Gain during Irradiance Heating Period (BTU/Day)
Total Heat Gain during Non-Irradiance Heating Period (BTU/Day)
Total Heat Gain after Non-Irradiance Heating Period (BTU/Day)
Total Heat Loss of Floor (BTU/Day)
Total Heat Contained in Thermal Mass at End of Day (BTU/Day)
Duration of Irradiance Heating Period (Hours)
Average Heat Gain during Irradiance Heating Period (BTU/Hour)
Thermal Mass Temp at End of Irradiance Heating Period (Deg F)
Instantaneous Heat Gain at End of Irradiance Heating Period (BTU/Hour)
Duration of Non-Irradiance Heating Period (Hours)
Average Heat Gain during Non-Irradiance Heating Period (BTU/Hour)
Thermal Mass Temp at End of Non-Irradiance Heating Period (Deg F)
Duration after Non-Irradiance Heating Period (Hours)
Average Heat Gain after Non-Irradiance Heating Period (BTU/Hour)
Thermal Mass Temp at End of Day (Deg F)
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