Table 2 Calculation assumptions of economic analysis of the DDSD.

From: Mathematical modeling, drying kinetics, and economic analysis of a hybrid photovoltaic thermal solar dryer for henna leaves

Parameter

Nomenclature

Unit

Value

References

Interest rate

\(d\)

%

20%

–

Maintenance cost

\(C_{m}\)

USD/year

3% of the annual capital cost

86

Salvage value

\(V_{a}\)

%

8% of the annual capital cost

87,88

Operating life

τ

year

30 years for the SD and 20 years for the PV system

89,90

Inflation rate

\(i\)

%

39.7%

–

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