[Stoves] "Those of us who believe that the WBT is critical to stove improvement"

Andrew Heggie aj.heggie at gmail.com
Thu Dec 7 17:33:10 CST 2017


On Thu, 7 Dec 2017 19:26:04 +0000,Crispin Pemberton-Pigott
<crispinpigott at outlook.com> wrote:

>The requirement is decontextualised and based on the maximum possible value, which is of course 'full throttle'. The computer on board was programmed to detect when it was being tested and redefined what 'full' means.

We'll have to disagree on whether it was right or wrong to take
advantage of a loophole, especially when the software was so deviously
written.


 In fact I suspect that there is more NOx  formed at a bit less than
full throttle because the formation depends on the presence of excess
oxygen as well as heat and pressure, at lower throttle settings (where
diesel conversion efficiency excels) the combustion has lower
temperature. Spark ignition engines are inherently lower in NOx
because they run with the right, premixed, air:fuel ratio. This may
not be the case with lean burn, stratified charge engines.

My concern would be that if such a loophole existed in the engine
scenario what makes you think that the same would not happen in the
stove context.What's at stake isn't the livelihood of  indigenous
stove manufacture but rather access for funding from the various
quangos Nikhil rails against.

Incidentally, and off topic for stoves, the diesel engine used in the
best selling UK assembled car has been independently tested in the
real world and found to be worse polluting than a 20 year old VW Golf
diesel which would not be able to be sold here again, yet the new
engine passes the euro 4 or 5 standard

Andrew




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