Manual T*SOL basic 5.0 - Valentin Software

8 Calculations User Manual T*SOL
The other parameters are simulation results. If you modify these values, a warning appears to inform you
that the change can only be reversed by running a new simulation.
! Until then, the program runs with the value entered manually here.
8.2.1 Results of the Financial Analysis
The Net Present Value and Cost of Solar Energy shown below are updated at the latest when the cursor is
placed in a different input field following entry of these values. As a result, you can see the influence of
the changes immediately.
For the net present value, savings and operating costs are discounted to the current day (life span, price
increase rate) and compared with the investment costs less subsidies. Positive net present values
indicate an investment which can be assessed as economically positive.
For the cost of solar energy, the investment costs less subsidies as well as the operating and
maintenance costs in annuities (life span, price increase rate) are assessed in relation to the solar heat
supplied.
Click on the button Financial analysis to access a preview of the results. This preview can be enlarged or
reduced in size by using the magnifiers.
Financial Analysis Input Parameters
Page Parameters:
Life span
The period stated by the manufacturer in which the system can be expected to be in operation. Between
10 and 20 years are estimated for solar systems.
Interest on capital
The interest on capital is the interest rate at which capital for the investment must be borrowed from a
bank or that at which the deployed capital could yield interest.
Price increase rate
The development of running and fuel costs play a key role for the net present value.
Page Investments:
Investments
The investments can be stated as a specific amount or as specific costs in €/m² of collector surface area.
Subsidy
The subsidy can be stated as a specific amount, as a percentage of the investments, or as a specific
subsidy in €/m² of collector surface area.
Page Running Costs
Costs
The fixed running costs of the system can be stated as an annual amount or as a percentage of the
investments per year.
The running costs of the pumps are results of the running time, pump output, and electricity costs
calculated by the simulation.
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