Repeatability of Cordwood Combustion Particulate Measurements

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Presentation transcript:

Repeatability of Cordwood Combustion Particulate Measurements Summary of Studies with the Condar Portable Dilution Tunnel Norbert Senf July 29, 2017 mha-net.org

Summary of Results COV coefficient of variation = standard deviation/average X 100 gives a percentage value for variability (lower is better)

Condar Portable Dilution Tunnel

Condar schematic

Condar Portable Dilution Tunnel

Condar used in 2006 New Zealand pellet stove field study

OMNI data, EPA stove

1.) Pellet Stove PM Repeatability EPA M5G-3 vs Condar Method Interpretation: Using a shortened version of the ASTM protocol, filters were pulled for each burn rate after approx 1 hr of sampling. With the 2” M5G filters, the catch was very low . The 6” Condar filters have 9X the catch and provide an extra digit of resolution.

Pellet Stoves, low filter catch (shortened ASTM method)

2.) Crib Repeatability HeatKit masonry heater, 22” (large) firebox, 1 repeat load Moisture map for pair of sequential cribs. Test was repeated with a closely matched pair, made from alternate (interleaved) sections of the dimensional lumber stock. Time lapse – double click to repeat

2.) Crib Repeatability HeatKit masonry heater, 22” (large) firebox

3.) Cordwood repeatability, MHA lab

2 MHA Repeatability Studies Cordwood in a masonry heater 22” firebox, Austrian eco-labelled air system – side ignition

2 MHA Repeatability Studies Cordwood in a masonry heater 22” firebox, Austrian eco-labelled air system – side ignition, W. Birch Time lapse – double click to repeat

2 MHA Repeatability Studies Cordwood in a masonry heater 22” firebox, Austrian eco-labelled air system – top ignition

2 MHA Repeatability Studies Cordwood in a masonry heater 22” firebox, Austrian eco-labelled air system – top ignition, Red Oak Time lapse – double click to repeat

Side ignition Top ignition Conclusion: For PM, pellet stoves had 3X better repeatability than a masonry heater fueled with cribs. Cribs had 1.5 – 2 X better repeatability than carefully matched cordwood loads in a masonry heater. To get a reliable PM number, cordwood likely will need more repeat runs than cribs.