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Mathematics 2021, 9, 33 25 of 31 by: by: is given by: n (1+i)n−1 is 0.96, and the mechanical efficiency of blowers is 0.90. Based on these data, the total initial cost of the system including the land and the equipment cost is estimated from the local manufacturers and comes out to be 18,000 PKR. Mathematics 2020, 8, x FOR PEER REVIEW 25 of 33 Figure 13. A framework of life-cycle-cost analysis adapted for the economic assessment of the Figure 13. A framework of life-cycle-cost analysis adapted for the economic assessment of the For an interest rate of 4%, and a life expectancy of 10 years, the capital recovery factor desalination plant. desalination plant. For an interest rate of 4%, and a life expectancy of 10 years, the capital recovery factor is given i(1 + i) The first annual cost can be cnalculated using the initial cost, and the capital recovery factor, given by: (1+i) −1 First Annual Cost = 180, 000PKR × CRF (36) CRF = CRF= i(1+i)n (35) The first annual cost can be calculated using the initial cost, and the capital recovery factor, given The maintenance cost is considered 5% of the first annual cost. The total running cost of the equipment involves the annual energy consumption given by: First Annual Cost =180,000PKR×CRF Annual Energy Consumption = 365 × Wpump + Wblower The maintenance cost is considered 5% of the first annual cost. The total running cost of the The energy consumption of the pump Wpump is calculated by considering the en- equipment involves the annual energy consumption given by: thalpy difference times mass flow rate corrected by its mechanical efficiency, and it is given by [85]: Annual Energy Consumption = 365×(W +W )×t Wpump = The energy consumption of the pump (Wpump ) is calculated by considering the enthalpy (38) m(H −H) pump obulotwer in (37) (35) (36) × t (37) ηm difference times mass flow rate corrected by its mechanical efficiency, and it is given by [85]: Wpump = m(Hout − Hin ) ηm (38) where m is the mass flow rate (kg/s) of water in the section, H is the enthalpy (kJ/kg) and ηm is the mechanical efficiency of pump which is considered 0.96 [86]. The blower Wblower is calculated by considering the pressure drop and it is given by [87]:PDF Image | Humidification Dehumidification Solar Desalination System
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