Costs for a solar thermal system with return on capital

For the cost calculations of solar thermal systems, the numeric values of the calculations without return on capital are again used. With an interest rate of 6 per cent and an operating period of 15 or 20 years the annuity factor becomes 0.1030 or 0.0872, respectively. Table 6.6 shows the heat generation costs for different investment costs, operating periods and annual substituted amounts of energy. Most solar heat production costs can only compete with electrical water heating systems. To compete with gas or oil heating systems they usually need public subsidies at present. In regions with high solar irradiations and low labour and investment costs, solar energy systems can also compete with fossil-fired heating systems.

Table 6.6 Levelled Heat Costs in €/kWhfherm for Solar Thermal Systems for Domestic Water Heating with an Interest Rate of 6 per cent and with Annual

Operating Costs of €40

Table 6.6 Levelled Heat Costs in €/kWhfherm for Solar Thermal Systems for Domestic Water Heating with an Interest Rate of 6 per cent and with Annual

Operating Costs of €40

Substituted amount of energy

Annual 2300 kWhherm

Annual 1150 kWhm

Lifetime

20 years

15 years

20 years

15 years

Investment cost

€5000

0.21

0.24

0.41

0.48

€3500

0.15

0.17

0.30

0.35

€2500

0.11

0.13

0.22

0.26

€1800

0.09

0.10

0.17

0.20

€1000

0.06

0.06

0.11

0.12

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