Austrian Eco Firebox TestingThis page was created on March 1. 2014See also: Eco firebox retrofit Go to test results June 18, 2014 update by Boris Kukolj  The heater in the lab has a replaceable firebox liner. The standard liner of firebricks on edge was replaced with this one. After the second course, the horizontal joints are shimmed open to create 5mm air slots. See Austrian specifications for firebox.  For this testing, the grate air was shut off. Underfire air could be used to burn up the coals at the end, to allow the chimney damper to be closed earlier. In the Austrian system, the stove is airtight. Chimney shut off dampers are not permitted. The air is shut off when the load is reduced to a charcoal bed.   Cross section of supply channels is 26.25 sq. in. Cross section of horizontal firebox air slots 27 sq. in.  Air enters air frame from below and is fed out the sides into the horizontal firebox 5mm air slots. There are also 3 mm air slots cut into the 4 inside corner edges of the air frame, aimed 45 degrees towards the firebox.  View from firebox, showing air horizontal and vertical air slot in air frame, aimed 45 degrees at the fire. Air frame is 3"x4" tubing. Total cross section of both legs is 20.6 sq. in.  View of top horizontal slot on air frame, aimed down at the fire at 45 degrees.  Click for video Test Results Runs GH-01 - GH-18 were by Homestead Heat, see below Update from Lopez Labs member Boris Kukolj, June 18, 2014:  Gas graph 1, Condar spreadsheet 1 Gas graph 2, Condar spreadsheet 2    Homestead Heat Testing:Heat-Kit Testing:March 20/14 - HK-M34 click on test numbers for full data Red oak cordwood, big pieces 0.58 g/kg PM (Condar) 20.071 g/kg CO 75.09% overall efficiency March 19/14 - HK-M33 Red oak cordwood, big pieces 0.41 g/kg PM (Condar) 13.97 g/kg CO 75.35% overall efficiency March 18/14 - HK-M32 Sugar maple cordwood. 0.47 g/kg PM (Condar) 13.92 g/kg CO 75.35% overall efficiency March 17/14 - HK-M31 Sugar maple cordwood. 0.55 g/kg PM (Condar) 14.34 g/kg CO 74.52% overall efficiency March 16/14 - HK-M30 White birch cordwood. 1.29 g/kg PM (Condar) 26.46 g/kg CO 71.36% overall efficiency March 13/14 - HK-M29 White birch cordwood. Small wood, cold fuel 0.96 g/kg PM (Condar) - estimated due to lack of 1 clean filter weight 16.04 g/kg CO 72.32% overall efficiency March 10/14 - HK-M28 Data loss due to power failure. Photographic record only. Red oak cordwood. Large wood. Average piece weight 5.4 lbs Side ignition. Newspaper 3/4 up the kindling pile. 71.2 lbs including 6.2 lbs kindling 23% moisture (est) March 9/14 - HK-M27 Red oak cordwood. Small wood, higher moisture than HK-M26 0.53 g/kg PM (Condar) 13.61 g/kg CO 74.75% overall efficiency March 8/14 - HK-M26 Red oak cordwood. Large wood. 0.46 g/kg PM (Condar) 16.76 g/kg CO 74.35% overall efficiency March 7/14 - HK-M25 White birch cordwood. Large wood, mix of wet and dry (see fueling details in Condar spreadsheet) 0.46 g/kg PM (Condar) 13.39 g/kg CO 73.60% overall efficiency March 6/14 - HK-M24 White birch cordwood. 0.89 g/kg PM (Condar) 15.33 g/kg CO 73.10% overall efficiency March 5/14 - HK-M23 White birch crib. Crib turned 90 degrees from HK-M22 Compare with HK-M22, below. It used the same crib and kindling, except the This test series has established the excellent repeatability of cribs for masonry heater testing, and Compare with HK-M22, below 0.93 g/kg PM (Condar) 20.57 g/kg CO 72.63% overall efficiency March 4/14 - HK-M22 White birch crib. Ignition from both sides. Compare with HK-M22, above 2.68 g/kg PM (Condar) 23.81 g/kg CO 71.70% overall efficiency March 3/14 - HK-M21 White birch cordwood. Large wood, top ignition Top ignition 1.35 g/kg PM (Condar) 17.31 g/kg CO 73.26% overall efficiency March 2/14 - HK-M20 White birch cordwood Too much newspaper, too fast a start 1.46 g/kg PM (Condar) 16.01 g/kg CO 73.26% overall efficiency |
This page was updated on May 4, 2018
This page was created on March 1. 2014
