INVESTMENT COSTS
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The investment costs should be estimated as accurately as possible. As can be seen in Fig. 16.2, a small difference in investment costs can influence the ranking of two heat recovery systems. When the present value of energy costs is 50% of the total costs, a discount of purchase price by 10% equals a 20% change in used energy (e. g., ventilation unit with heat recovery, interest rate 6%). This means that in this case a 10% more expensive unit will use 20% less energy than a less expensive unit. |
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1.5 |
3 4.5 6 |
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Maintenance cost/period |
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.P |
0 0 |
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R,» |
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_— |
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<Ј; • ‘ |
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LCCM and LCCo, Maintenance and disposal cost (present value) |
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Life cycle, years —— ► |
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O ЈD |
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Disposal cost |
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B O |
FIGURE 16,4 Disposal costs will be calculated separately and added to the present value of the investment. The same method applies to maintenance costs if they are not constant every year.
M = calculation period in years I = interest rate.
Posted in INDUSTRIAL VENTILATION DESIGN GUIDEBOOK