Water Heaters as Energy Storage

Total energy falling on horizontal surface 950 - 1150 kWh/m2 per year
Profit from the energy in pasive systems 20 - 50 % in heating season
Profit from the energy in active systems of centralheating 30 - 40 % in heating season
Profit from the energy in active systems of domestichot water 50 - 80 % per year
Profit from the energy in active systems with summerpool 70 - 90 % per season
Profit from the energy in flat collector for domestichot water 400 - 550 kWh/m2 per year
Max sun energy falling on horizontal surface till 8 kWh/m2 per day
Effectivity of sun collectors (following the locationand use) 50 - 80 %
Optimal orientation of the collectors south - southwest
Suitable orientation of the collectors south - southeast
Max power of the collectors Around 2 p.m.
Optimal tilt for summer operations around 30° from the horizontal position
Optimal tilt for all year operations around 45°
Optimal tilt for winter operations around 60° - 75°

Source: www.tzb-info.cz

Photovoltaic water heating

Water Heaters as Energy Storage