Another Bypass Valve question!

This video got me thinking about a few things, hence this 2nd thread for clarity.



I was thinking of the situation where you may need on occasions a room heated really quickly and you only need the room for an hour or so - does this to achieve that aim by significantly speeding up heating time and if so by how much (I realise if it does it also means it will cool down very fast)
Is it just a case that using the bypass the barrel is heated must faster, as its not heating the thermal mass, giving off faster immediate but shorter in time, radiant heat to the room?
I take it that divert process is no less efficient?

When working properly, the burn works just as efficiently either way. It's basically the whole point of the rocket tech in the first place, super hot, super complete burns which produce more total heat for less total fuel.

So you have net heat (H) from a burn at max efficiency. That heat can go 1) into your space 2) into mass (then later into the space) 3) or out with exhaust. It's the control between these 3, not variations of H that give you your answer.

What sort of space is it?

Mike Leo wrote:When working properly, the burn works just as efficiently either way. It's basically the whole point of the rocket tech in the first place, super hot, super complete burns which produce more total heat for less total fuel.

So you have net heat (H) from a burn at max efficiency. That heat can go 1) into your space 2) into mass (then later into the space) 3) or out with exhaust. It's the control between these 3, not variations of H that give you your answer.

What sort of space is it?

thanks Mike. Its all theory at the moment.
Lets say I wanted to heat a room about 25 sq metres (270 sq foot). If I only wanted it heated quick to use it for an hour how long (if switched to divert away from the thermal mass) how long would it take roughly to heat up a cold room? Also how long would the room stay warm in this mode - can it be fed to pretty much heat it for that hour and then tail off nicely to not waste fuel?

Jason M. :
Mike Leo: Actually with a working by-pass( that none of the three of us has ever seen!), a vertical chimney by itself would not have any of the additional losses of volume
and velocity cased by the effects of friction as the Exhaust gases flow through some thirty feet of thermal bench, this is usually referred to as Laminar Flow, I would expect
that the amount of time saved would be a matter of 1 minute or less, without the losses due to laminar flow your chimney should draw a little better and produce a slightly
hotter fire slightly quicker with a little more heat being radiated off of the barrel !

Where a given R.M.H. build runs into trouble is when an undetected fault is coupled with too much Horizontal chimney, (remember that any one horizontal stove pipe elbow
will slow the flow of the exhaust gases equal to 5' of horizontal pipe) some times it is possible to salvage a marginal system by adding several more feet of vertical chimney
This is usually figured at 15' of vertical being equal to an additional 10' of horizontal piping !

Finally I want to make a plea for the almost always peaceful and placid Dragon residing in your R.M.H., If he is woken gently in the morning, and fed Frequent amounts of
small very dry wood, within no more than 5 min you should hear the start of his throaty purr, at 10 minutes (s)he will be a full song and you will always be able to tell how
happy it is by listening to this song !

After about an hr of frequent feedings the burn tunnel should be glowing red hot and you can now feed larger chunks, 3-5 pieces mostly filling the feed tube, at this point
your dragon needs to be fed about every hour (depending on type of hard wood fed it!), with the R.M.H. given Pride of Place within your home, you should be instantly
aware of any change in the dragons song, perhaps shifting a piece of wood fuel that has 'hung-up' in the feed tube or just one or two more wood chunks, after 6 -8 hours
of listening to your dragons song in all but the coldest weather it should now be time to let your fire burn out and enjoy the next 20 - 25 hours of your dragon paying you
back for your faithful service ! WARNING ! - Any Failure to abide by this simple ritual, which should be considered as like a labor of love rather than a duty, or especially
long periods of ignoring your Dragon with be meet with Cold when you want Hot, and Frenzy when you want Calm! (Some times even SMOKE!!) For the Good of the Craft !

Think like Fire, Flow like a Gas, Don't be the Marshmallow ! As always, your comments and questions are Solicited and Welcome ! Pyro - MAGICALLY yours, Big AL !