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calculations are split between the Capital calculations, Operational calculations and Total costs where any differences between conventional and vacuum drying calculations are noted. Annual throughput We define the annual throughput as: totalcapacity(m3 ) =no.of kilns ×kilncapacity annual throughput (m3 /yr) = total capacity × kiln cycles per year (4) (5) Where, 24 (6) kiln cycles per year = operational year × run time Capital calculations – depreciation We calculate the annual cost of plant capital or depreciation using: cost plant capital ($/yr) = no. of kilns × kiln capital (7) project life cost plant capital ($/m3 ) = cost plant capital ($/yr) (8) annual throuput Capital calculations –stock interest cost If the air-drying time is set to a value greater than zero weeks, the following calculations are performed to determine the annual interest and interest per cubic metre on the dry yard stock: volume air dry yard stock (m3 ) = total capacity × air drying time ×7 × 24 (9) final drying time cost of air dry stock interest ($/yr) = volume air dry yard stock × wood value × interest rate (10) 1000 cost of air dry stock interest ($/m3 ) = cost of air dry stock interest ($/yr) (11) annual throughput Similarly, the following calculations are performed to determine the annual interest and interest per cubic metre on the kiln stock: cost of kiln stock interest ($/yr) = total capacity × wood value × interest rate (12) 1000 cost of kiln stock interest ($/m3 ) = cost of kiln stock interest ($/yr) (13) annual throughput Capital calculations – totals The total capital costs are calculated as follows: total capital cost ($/yr) = cost plant capital + cost air dry stock interest + cost of kiln stock interest (14) 15PDF Image | Evaluation of super-heated steam vacuum drying
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