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The vacuum system can lower the ambient pressure to about 2.66 kPa (0.4 psi) and the RF power is provided by a proprietary amplifier designed to a rated output of 150 kW. Since the load capacity was about 30m 3, this type of RF dryer had the "30.150" designation which allows for a maximum power density of 5 kW/m 3. The power amplifier technology allows the system to determine the average moisture content of the kiln charge, known as an "end point" detection feature, which is another patented innovation. Power amplifier technology allows for absolute control of the RF power, thereby eliminating the risks of the drying degrade know as internal honeycomb; something that has been commonly associated with earlier RFV drying technology. This new dryer has been extensively used since the beginning of this year with various wood species and timber sizes. The new dryer has performed remarkably well compared to older-style RF generators using oscillator designs with the most striking effect being the reduction of energy use by about 40-50% (down to as low as 1.38 kWh/kg of water removed). Testing of the "30.150" dryer continues with the drying of hardwood (temperate and tropical) species, utility poles and logs, and other wood products such as veneer and trim-ends. Recent commercial RFV kiln drying successes – SOFTWOOD TIMBERS The short RFV drying times of thick lumber (> 105 mm or 4" thick) in comparison to conventional or Superheated Steam Vacuum (SSV) kiln drying times translates to one of the more immediate opportunities for the lumber manufacturer. The results from recent drying runs at the commercial RFV kiln are shown in Table 1. TABLE 1 – Timber drying economics in a 50 m3RFV kiln. RF into wood Drying Time Processing Rate Total Electricity per Charge Energy Cost @ 4.50/kWh $ / Mfbm 4" D.fir 45% -17% 75 kW 67 hrs 172 Mfbm/mo 10,000 kWh $454 $23.77 12" D.Fir Timbers 45% -17% 38 kW 134 hrs 76 Mfbm/mo 13,400 kWh $605 $31.70 12" Spruce Timbers 35% -17% 75 kW 38 hrs 305 Mfbm/mo 5,760 kWh $259 $13.58 12" Hemlock Timbers 45% -17% 75 kW 60 hrs 191 Mfbm/mo 8,960 kWh $403 $21.13 It must be emphasized that these drying times are not absolute. RFV drying in many respects can be considered a new technology and RFV kiln schedule development work Western Dry Kiln Association 39 May, 2000PDF Image | COMMERCIAL RFV KILN DRYING
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