This book discusses conventional as well as unconventional wood drying technologies. It covers fundamental thermophysical and energetic aspects and integrates two complex thermodynamic systems, conventional kilns and heat pumps, aimed at improving the energy performance of dryers and the final quality of dried lumber. It discusses advanced components, kiln energy requirements, modeling, and software and emphasizes dryer/heat pump optimum coupling, control, and energy efficiency. Problems are included in most chapters as practical, numerical examples for process and system/components calculation and design. The book presents promising advancements and R&D challenges and future requirements.

chapter 1|2 pages


chapter 2|18 pages


chapter 3|29 pages

Moisture in Wood

chapter 4|24 pages

Moist Air

chapter 5|11 pages

Importance of Wood Drying

chapter 6|36 pages

Wood Drying Methods

chapter 7|79 pages

Mechanisms of Lumber Drying

chapter 8|119 pages

Kiln-Wide Lumber Drying

chapter 9|77 pages

Heat Pump-Assisted Wood Dryers

chapter 10|63 pages

Heat Pump Systems for Drying

chapter 11|26 pages


chapter 12|8 pages

Heat Exchangers without Phase Changes

chapter 13|68 pages

Moisture Condensers

chapter 14|36 pages

Refrigerant-to-Air Condensers

chapter 15|36 pages

Heat Pump Modeling

chapter 16|37 pages

Case Studies

chapter 17|11 pages

Present and Future R&D Challenges