Report No. 102092693MID-008a Client: Dectra Corporation
Report Revised Date: March 31, 2016
Page 8 of 13
Model: WHS1000
III.C. AIR SUPPLY SYSTEM Combustion air enters from a fresh air intake located on the rear of the unit. The air travels to a collar in the front of the unit where it enters the firebox via primary and secondary combustion air nozzles. The movement of combustion air is aided by a constant 3600 RPM induced-draft combustion air blower. Combustion products flow through a heat exchanger system before exiting through a 6-in flue collar located at the top back of the outer enclosure. Combustion air is terminated by an electronic digital controller. The controller compares the flue and water temperatures until they fall to within 5 °F of each other. The blower is then turned off and combustion air is terminated. III.D. OPERATION DURING TEST The boiler is operated until the entire fuel load is consumed and there is no further combustion in the firebox. The end of the test is determined when the water storage The fuel used was Douglas fir. The fuel was split cordwood with dimensions around 6-in thick x 12-in wide x 24-in in length. The fuel was dried to average moisture content between 19% and 25% on a dry basis. III.F. START-UP OPERATION The cordwood fuel started with newspaper and a measured kindling load. As the test load was being lit, the sampling system was started simultaneously. The unit was allowed to operate until all combustion in the firebox had ceased. IV. SAMPLING SYSTEMS temperature is no longer increasing. III.E TEST FUEL PROPERTIES
The ASTM E2515-11 sampling procedure was used.
IV.A. SAMPLING LOCATIONS Particulate samples are collected from the dilution tunnel at a point 16 feet from the tunnel entrance. The tunnel has two elbows ahead of the sampling section. (See Figure 3.) The sampling section is a continuous 14-foot section of 10-inch diameter pipe straight over its entire length. Tunnel velocity pressure is determined by a standard Pitot tube located 96 inches from the beginning of the sampling section. The dry bulb thermocouple is located six inches downstream from the Pitot tube. Tunnel samplers are located 36 inches downstream of the Pitot tube and 36 inches upstream from the end of this section. (See Figure 1.)
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