-Sup Han

Application of hook-lift trucks in centralized logging slash grinding operations

Background: Chip vans are large trucks commonly used for transporting comminuted woody biomass from forests, provided the roads are suitable for the truck. Smaller trucks can effectively negotiate adverse road conditions such as sharp curves and steep grades and improve access to forest residues (i.e., logging slash). Discussion: This study evaluated the operational performance and costs of a forest biomass harvesting system, utilizing a hook-lift truck in centralized grinding operations in northern California. Conclusion: A centralized grinding operation utilizing a hook-lift truck was cost effective in collecting previously inaccessible forest residues for energy production. The total system production cost (woods landing-to-chip van) was estimated at US

Productivity and Cost of Integrated Harvesting of Wood Chips and Sawlogs in Stand Conversion Operations

32.98/bone dry ton (BDT) with an hourly production of 10–37 BDT and a total production of 267.5 BDT.

Evaluating the System Logistics of a Centralized Biomass Recovery Operation in Northern California

This study evaluated the operational performance and cost of an integrated harvesting system that harvested sawlogs and biomass (i.e., energy wood chips) in stand conversion clearcut operations. Douglas-fir (Pseudotsuga menziesii) trees were processed into sawlogs while whole trees of tanoak (Lithocarpus densiflorus), and sub-merchantable materials (small-diameter trees, tops and limbs) were fed directly into a chipper to produce biomass for energy production. A standard time study method was used to determine productivity and costs. Over 26 working days, the integrated system produced 1,316 bone-dry metric tonnes (BDTs) of sawlogs, and 5,415.89 BDT of chips, with an average moisture content of 43.2%. Using the joint products allocation costing method, the costs of the integrated system were

Effects of grate size on grinding productivity, fuel consumption, and particle size distribution.

29.87/BDT for biomass and

Productivity and cost of integrated harvesting for fuel reduction thinning in mixed-conifer forest.

4.26/BDT for sawlogs. Chipping utilization was as low as 41%, directly affecting production and cost of chipping operation. Single-lane, dirt, spur roads were the most costly road type to transport whole trees to a centralized processing site: transportation costs for biomass and sawlogs were increased by

Early Precommercial Thinning of Redwood Sprout Clumps: Evaluation of Four Techniques

0.08/BDT and

Economic analysis of a small-sized combined heat and power plant using forest biomass in the Republic of Korea

0.02/BDT, respectively, for every 50 meter increase in traveling distance. Diesel fuel price could raise total system cost for each product by

Moisture Content in Forest Residues: an Insight on Sampling Methods and Procedures

0.78/BDT and

A Study on the Assessment of Standard Wage System for Forestry Workers in Korea

0.08/BDT for each

Productivity and cost of cut-to-length and whole-tree harvesting in a mixed-conifer stand

0.10/liter increase.