Wet Fuelwood and Kiln Fuel Bills: The True Fuel Mass Multiplier at Common Moisture Contents, Against the Claim That Wet Wood Burns Almost as Well

This paper addresses the belief, repeated at many wood yards, that partly seasoned wood burns almost as well as dry wood in a kiln. It presents a fuel-mass multiplier table that tests that belief directly from evaporation arithmetic, derived entirely from stated assumptions and a computation whose code and full output accompany the paper. The sweep covers fuelwood moisture content from 10 to 60 percent wet basis. The headline outcome is: multiplier at 50pct 2.07; multiplier at 30pct 1.35; effective heat at 10 mj 15.94; effective heat at 60 mj 5.64; claim almost as well holds False. These figures identify a specific operating point or bound that a workshop can apply directly, and they also show how quickly performance deteriorates away from it. No kiln was built, no ware was fired, and nothing was measured for this study. SIMULATED, NOT MEASURED.