One roof full of solar collectors produces 30-50% of all heat demand http://www.vtt.fi/proj/ecocitychina/presentations/Urban_solar_energy_schemes_as_s

http://www.vtt.fi/proj/ecocitychina/presentations/Urban_solar_energy_schemes_as_sustainable_energy_Lund.pdf

Total residential floor
area 64,000 m2
• From 80 to 250 m2 per
house; altogether
1,400 m2 of solar
collectors
• Collectors produce
300-450 kWh/m2 per
year
• One roof full of solar
collectors produces
30-50% of all heat
demand

One roof full of solar
collectors produces
30-50% of all heat
demand

One roof full of solar
collectors produces
30-50% of all heat
demand

One roof full of solar
collectors produces
30-50% of all heat
demand