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A study sf eommereial, wood-fired evaporators revealed that normal expected thermal efficiencies are between 35 and 50 percent. The moisture content and quality of ~o o d fuels used and the desigrl and method of firing the evaporator are critical in determining evaporator efficiency and the economic implications of using wood. Garrett, hwreraee D. 1981. Efficiency of using solid wood fuels in maple symp evaporators. Northeat. For, Exp. Sdn., Broomail, Pa. 10 p" illus, (USDA For, Sew, Res. P L~,doi:10.2737/ne-rp-486 fatcat:pmixtv3mnjhc7hxuuosh6huw74