Diagram 9 shows the emission
reductions which can be achieved with a solar energy installation designed for
a family with 3 members. It can be seen that the purchase price of the installation
is amortising over period of 15 years through the savings that can be made because
less electricity is needed.
The calculation presented in diagram 9 is based on a system consisting of a flat plate collector or storage collector including a storage tank (~300 litres) as well as corresponding components and raw materials (without assembly costs). An electricity tariff of 0,34 DM/kWh was assumed which included the fixed basic price and the value added tax.
Over a period of 20 years the following is drawn in into the diagram:
Diagram 9: Ecological and economical comparison of a solar energy system designed for a family with 3 members in Germany over a period of 20 years
|Anschaffungskosten in DM||=||Purchase price in DM|
|Kostenminderung in DM pro Jahr bei Strom||=||Electricity cost savings in DM per year|
|CO2 Minderung in Kg bei Heizöl-EL||=||CO2 reduction in Kg if fuel had to be used|
|Säureminderung in Liter bei Heizöl-EL||=||Combustion acid reduction if fuel had to be used|