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Plant D provided the area of their storage building, which was 13,500 square feet. The volume of dried lumber that was stored in this building was 4.65 MMBF, and the cost/value of the building was $50/square foot. For plant C, the area of the storage building was calculated by establishing a relationship between the square feet and the volume of lumber dried in Plant D. The storage building area obtained for Plant C was 152,942 square feet for conventional drying, 3,875 square feet for vacuum with air drying, and 7,750 square feet for vacuum with no air drying. The price of the building was then multiplied by the total square feet of the building area. The price of the kiln company A boiler of 75 HP was $125,000, auxiliary equipment was $ 2,500 and the concrete foundation for conventional drying was $ 35,000. The price of the kiln of 80,000 BF kiln capacity was $312,500 as provided by Plant D. The price of the kiln, auxiliary equipment and concrete foundation were summed and multiplied by the number of kilns that each case study used (for Plant C, 7 kilns). The value was then added to the price of the boiler. Regarding vacuum drying costs, company A and B from section 4.1 provided information about: 1) price of the equipment and material handling, 2) cost of electricity(kW, BTU’s, fuel consumption, and 3) kiln board feet capacity. However, the companies were not able to provide information about vacuum and condenser rate and price, and thermal loss. These values were obtained from a study conducted by Redman (2011) (see chapter 2). The capacity of the vacuum kilns was 12.14 MBF. The number of kilns used in the model was estimated by the annual throughput for Plant C divided by the average drying rate (4 days for vacuum with air drying and 8 days for vacuum with no air drying); the obtained value corresponded to the number of loads per year. Then the number of cycles per year was multiplied by the capacity of the kiln, which referred to the throughput per year. Then the annual throughput per year for Plant C was divided by the estimated throughput with vacuum drying. A total of 13 vacuum kilns for the scenario of vacuum drying with air drying were obtained. The same steps were used to calculate the number for vacuum with no air drying, with the exception of using 8 days for drying times. A value of 25 kilns was obtained. 74PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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