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vacuum drying with air drying and vacuum drying with no air drying, respectively. The IRR values for Plant D were 37%, -13%, and 43% for conventional drying, vacuum drying with air drying and vacuum drying with no air drying, respectively. The two scenarios evaluated in the feasibility analysis (conventional and vacuum with no air drying) were cost effective in terms of net present value and internal rate of return. However, vacuum with no air drying had higher values of NPV and IRR, which means that, is more feasible or more economically viable than conventional drying. The scenario of vacuum with air drying was not economically feasible in terms of NPV and IRR. The capital costs of the vacuum kiln, boiler and auxiliary equipment, and raw material costs were the parameters that impacted the total costs among the three different scenarios. For plant C the capital investment of the kiln, boiler, and auxiliary equipment for vacuum with air drying was 23% higher than in conventional drying; and vacuum with no air drying was 61% higher than in conventional drying. Vacuum with no air drying required 50% more kiln capacity than vacuum with air drying. For plant D the total capital investment of the kilns, boiler and auxiliary equipment for vacuum with air drying was 44% higher than in conventional drying and vacuum with no air drying was 71% higher than in conventional drying It can be seen that vacuum with no air drying is more economically feasible regarding NPV, IRR, and inventory cost. Table 25). In terms of inventory cost, vacuum with air drying was 60% more than in conventional for Plant C; while for Plant D, vacuum with air drying inventory cost was 66% more than conventional drying. It can be seen that vacuum with no air drying is more economically feasible regarding NPV, IRR, and inventory cost. Table 25 Capital Cost Investments for Plant C and D Parameter Kiln equipment Inventory Cost conventio nal $2,575,000 16,061,500 Plant C vacuum with air drying $3,333,850 39,779,935 vacuum with no air drying $6,659,700 12,698,231 conventio nal $2,225,000 14,673,750 Plant D vacuum with air drying $3,938,550 43,634,986 vacuum with no air drying $7,566,750 11,174,443 93PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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