[Stoves] EPA emissions units
tmiles at trmiles.com
tmiles at trmiles.com
Sun Jul 8 11:41:08 CDT 2018
Norbert,
Thanks for the update in terms that we can understand.
Kind regards,
Tom
From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of Norbert Senf
Sent: Saturday, July 07, 2018 11:47 AM
To: Discussion of biomass <stoves at lists.bioenergylists.org>
Subject: [Stoves] EPA emissions units
Further to Crispin's question regarding units for emissions regulations:
For U.S. wood burning domestic heating stoves, PM is regulated. It is measured with a standardized laboratory fueling protocol, based on mass of fuel per unit of firebox volume. PM is measured with a dilution tunnel (EPA Method 5-G2).
PM is reported in grams of particulate per hour of burning, based on a weighted average at 4 specified burn rates (EPA Method 28)
Currently the limit is 4.5 g/h, with a proposal to lower it to 2.5 g/h in the next round of regulation.
For wood burning masonry heaters (not regulated by EPA), we use grams of PM per kilogram of dry weight of fuel. At the EPA low burn rate for stoves (1 kg/hr), g/kg and g/h are equal, based on a 24 hour storage/heating cycle for a roughly 2 hour batch burn in a masonry heater. Coincidentally 1 kg/h is the average burn rate of the average stove in the U.S.
A decent masonry heater will get around 1 g/kg of PM, burning cordwood. A state of the art one will do 0.5 g/kg. This compares to a domestic pellet stove at around 1 g/kg.
Domestic boilers are regulated in terms of pounds of PM emissions per million BTU's of delivered heat. The limit is 0.32 lb/MMBtu. At 75% efficiency, this is equivalent of 1.7 g/kg.
Best .............. Norbert
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