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Let's re-evaluate dry kilns

Corvallis, Or. : Western Dry Kiln Clubs
Publication Date
  • Kilns
  • Design


LET'S RE-EVALUATE DRY KILNS Mr. Harvey J.. C. Oster, President C. M. Lovsted Inc. , Seattle, Washington The subject of this discussion is probably confusing to you. Over the past 25 years I've sat in on many dry kiln meetings and on occasion I have been a speaker. I have been troubled for some time on what to talk about that would be interesting and beneficial to dry kiln audiences. Keeping these thoughts in mind and coupling this with the great variation of the new dry kilns that have been built in the past several years, I felt that it might be well to stop and re-evaluate the dry kiln specifications into todays demand for reduced product cost. I felt that in re-evaluating the 5 basic dry kiln areas that we could touch upon something that would be of interest to all of you. Something that you came here wondering about - for some the dry kiln building - for others steam heated kilns - gas or oil fired kilns - the kiln machinery - and for others, whats the status of high frequency or micro-wave drying. My five basic dry kiln areas axe: (1) THE DRY KILN BUILDING (2) RADIATION (3) CIRCULATION (4) VENTILATION (S) HUMIDIFICATION (1) Most common dry kiln building today can be sub-divided into: 2 major designs (1) Expanded shale block walls - or concrete formed on the ground (tilt) (2) Insulated metal walls with the roofs sub-divided into: Insulated metal Expanded shale concrete prestress, formed on ground and cast in place, transite and zonolite and transite cavity These are probably the two most common kiln buildings today. The expanded shale concrete block with a heat transfer factor of around 0.16 and the aluminum skin insulated wall panel with fiberglass or polyurethane insulation with a similar U factor. The aluminum however does deteriorate and is "eaten thru" by the acids and the many aluminum kiln buildings are then painted. You can no doubt give me several pros and cons for each of these de- signs - I certainly can give you several. The roof of the dry kiln has always been a t

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