Green timber refers to newly cut wood that has a moisture level of more than 60%, not because it is emerald in colour. All timbers have the potential to take in and discharge water like sponges because they are hygroscopic. Timber can store plenty of amounts of water, up to 200% of its weight.

This moisture is beneficial because, during the tree’s life, it enables it to absorb nutrients from the soil. Timber may become more flexible and simple to work with at high moisture levels. High moisture levels, however, provide several risks to health and the environment from the perspective of firewood. That’s when we need Kiln dried wood.

How is wood dried in a kiln?

Wood that has been burned in a specialised kiln is known as kiln-dried timber. With more fuel still available for burning, this warms the wood without destroying its fibres. As the wood warms up, the extra moisture that has been retained inside of it evaporates, causing the wood to dry out from the inside out.

To reduce the moisture content of the wood to under 20% and prepare it for burning, kiln drying is frequently utilised. In addition to increasing burning efficiency, the kiln drying procedure aids in the removal of contaminants that the wood absorbed throughout the growing phase.

Procedure for kiln drying

Species-by-species sorting occurs at the sawmill after the timber has been harvested, after which it is delimbed and transported. Debarking is followed by grouping the trunks according to size and moisture content. This grouping procedure is essential because uniformly sized and moist-contented wood facilitates the kiln drying process.

The logs are prepared for kiln drying after they have been debarked and arranged. The prepared logs are often kept in storage until a room in the kiln becomes available since the kiln drying procedure takes about 4-6 days. After that, the batches of wood are fed into the kiln by the kiln’s size and kind.

To dry wood for firewood, a variety of kiln types are employed, but traditional and dehumidification kilns are by far the most popular.

Traditional kilns

The main component of traditional kilns is a boiler that burns gas to heat a thermally efficient chamber. Through the use of circulating fans, the heat is then distributed across the timber, where it draws moisture out of the wood (a process known as evaporation). A chimney is used to release the extra water vapour after that.

Dehumidification kilns

Heat pumps are used to create and reuse heat in dehumidification kilns. The procedure begins with the air being heated to a degree. Then, rotating fans are used to force this warm air over the timber in the chamber. Like a traditional kiln, the water that the lumber had stored evaporates as a result.

But in contrast to a typical kiln, this steam is not released; instead, it flows into an evaporator coil, which decreases its temperature and condenses the vapour again into a liquid. While this is happening, the water is heated using the heat that was lost during condensation.

If you are searching for the best quality Kiln Dried Logs in Glasgow, contact Kane Coal. We offer top-quality kiln-dried logs at competitive prices. Visit our website and get in touch with us to place your order today.