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Continue of Appendix A. Variables Annual fuel consumption (gal or 1000 ft3) Fuel cost ($/gal) Annual electrical usage attributed to drying (kWh) Electrical cost ($/kWh) Cost of heat Holmes and Bilek 19831 x x Models McMillen and Wenegert 1978 Redman Fortin Rebb 2011 2010 2011 Govett et. al2006 Suggested Model Fixed Costs ENERGY COSTS InitialMC x Specific heat of water Heat of vaporization FinalMC x Kiln cycles per year Vacuum pump rating Vacuum pump usage Dryingtime Condenser fan rating Condenser fan usage Air drying and Air Flow Number of fans Fan rating Air drying time (weeks) Final drying time (hrs) Wood basic density (kg/m3) Volume air dry stock Cost of dry stock interest Maximum drying temperature Minimum drying temperature Thermal loss Steam X x X X X x X x X x X x x X x X X x X x x x x x x x x x x x x x x x x x x x x x x x x x x x x x XXx XXx XxXXx X x x x XxX x x x x x x X x x x x x x x x 1DEP by Holmes and Bilek (1983) 3Evaluation of super-heated steam vacuum drying viability and development of a predictive drying model for four Australian hardwood species by Redman (2011) 4Calculating Drying Costs by Fortin (2010) 5Fuels Calculator by Rebb (2011) 6DRYFEAS by Govett et. al(2006). 2Drying Eastern Hardwood Lumber by McMillen and Wegert (1978) 142PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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