On 20/04/17 22:59, Andrew wrote:
Jeff Layman wrote:
What I find interesting
is just where the Ecodesign limit lines are placed. Where the Ecodesign
stoves do better (whatever that may mean) than the open fire and old
stove the limit line is placed above it and below them. Now have a look
at the NOx histogram on the bottom right. The Ecodesign stove is
actually worse than the older stove! So where is the limit line placed?
Above all of them - even the open fire.

Exactly!

Given the inherent variables in any stove set up (draw of
flue/atmospheric conditions/fuel quality/mode of usage), I can see the
Ecodesign stoves meeting all the specified conditions in the test lab,
but being wide of the mark in the real world. All at extra cost in
terms of design and development, testing and certification, ultimately
paid for by the consumer.

I've just sent an enquiry to the SIA asking where the limits came from,
and asking them to comment on the higher NOx level from the Ecodesign
stove, particularly with the current concern over high NOx levels from
diesels in cities.

I wonder what their answer will be?

--

Jeff