CNC Report 08.26.24 8.5x11 - Flipbook - Page 136
05 DECARBONIZATION PATHWAY
DETAILS AND KEY ASSUMPTIONS
Residential case study is for a 4-person home with a density of 500 sf/person.
PV coverage assumes 60% coverage on the roof and is horizontal PV on a flat roof with an efficiency
of 20%.
Emission factor natural gas: 0.284 lbs CO2/kBtu
Emission factor eGrid: 0.197 lbs CO2/kBtu *
COP (Coefficient of Performance):
Airsource Heatpump:
Heating: 3
Cooling: 4.5
Existing Cooling: 3
Natural Gas Furnace: 0.9
Natural Gas for Hot Water: 0.65
Electric Hot Water: 2
Embodied Carbon:
PV: 30 lbs CO2/sf-PV
Heat Pump: 4.4 lbs CO2/sf
(source: KBOB / ecobau / IPB 2009/1:2022 )
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archimania
Transsolar
KlimaEngineering
