PDF Publication Title:
Text from PDF Page: 007
Recent Commercial RFV Kiln Drying Successes – VENEER One of the more commercially accepted applications of RFV drying with the older 1970's - type of technology has been with green hardwood veneer. The veneer sheets can be solid-stacked and since the wood products are relatively thin in thickness, RF power density and internal honeycomb have not been issues with the older RF oscillator technology. However, RF oscillators have a tendency to operate with great difficulty on wood at moisture contents less than 15%. Energy efficiency decreases and drying times unnecessarily increase. This is not the case with RF power amplifier technology. In addition, RF power amplifier technology allows RFV kilns to reach higher power densities compared to RF oscillators. Grade recovery is extremely high with RFV veneer drying which justifies the operating and capital cost of RFV kilns for decorative green hardwood veneers. In the case of commodity plywood veneer, RFV re-drying is more suitable for this application. Below is a table that outlines veneer drying costs and times: TABLE 4 – Veneer drying economics in a 50 m3 RFV kiln RF into wood Drying Time Processing Rate Total Electricity per Charge Energy Cost @ 4.5¢/kWh $ / Mft2 SPF 12% -8% 150 kW 5 hrs 1.9 MMft2/mo 1,100 kWh $48 $0.30 HemFir 12% -8% 150 kW 5 hrs 1.9 MMft2/mo 1,100 kWh $48 $0.30 Q-Sift Aspen 50% -8% 250 kW 27 hrs 305 Mft2/mo 10,300 kWh $464 $2.91 Red Oak 70% -8% 250 kW 68 hrs 114 Mft2/mo 25,860 kWh $1,164 $7.31 One opportunity that RFV drying has to offer is making the process known as Q- Sift® viable. Milota revisited the issue of "post-drying" hemfir lumber (Milota and Wu 1995), a topic which was discussed at WDKA meetings over twenty years ago. As discussed in the re-dry section above, RFV drying times are very short, kiln productivity is very high, and commercial demonstrations are showing that RFV re-dry degrade is very low; especially when compared to re-drying by conventional methods. Western Dry Kiln Association 42 May, 2000PDF Image | COMMERCIAL RFV KILN DRYING
PDF Search Title:
COMMERCIAL RFV KILN DRYINGOriginal File Name Searched:
Commercial_RFV_ocr.pdfDIY PDF Search: Google It | Yahoo | Bing
5,000 BF Shipping Container Lumber Dry Kiln For Quality Lumber The 5,000 BF container kiln consists of one 40 foot high-cube aluminum shipping container... More Info
Shipping Container Lumber Dry Kilns by Global Energy Global Energy designed and developed the container kiln back in 1991. The purpose is to give access to portable sawmill owners, furniture makers, and small business the value added profit of dry kiln lumber and quality hardwoods... More Info
Vacuum Kiln Conversion Kit for Lumber and Wood Dry Kilns Convert your existing conventional dry kiln into a fast drying vacuum kiln. Similar to vacuum bagging in the boat building and aircraft industry, we have come up with a proprietary process which allows you to build a very simple vacuum kiln at a fraction of the price, and without the intensive conventional metal chamber structure... More Info
Vacuum Pump Cart System for Bagging Clamping Wood Drying and more Vacuum Cart with 2HP Pump and Dual Pistons with multiple multiplex vacuum ports and liquid reservoir... More Info
Vacuum Bagging Basics Vacuum bagging is a method of clamping, which has traditionally been used in the composites industry, but can also be used for vacuum drying materials, including wood products... More Info
CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com (Standard Web Page)