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... not Russel! Registered Member #1
Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052
I can think of plenty of reasons why CO might not disperse evenly throughout a home, such as temperature effects -- warm CO-laden air from a leaking exchanger will collect near the ceiling, at least initially. The overall effect will be very small, however, and the CO will inevitably disperse evenly fairly quickly. It simply won't float up on its own accord. N2 and CO are nearly identical in molar mass, while O2 is over 14% heavier than either, and has no tendency to pool near the floor. I'd worry a lot more about making sure the detector is working, is placed in a suitable room, and so on.
Registered Member #2123
Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
I agree, diffusion and turbulence will eventually disperse CO over time just like CO2 is eventually dispersed from around volcanic vents where it initially pools in low spots in high enough concentrations to kill animals and people.
I suppose that CO will be coming from a combustion source and will be mixed with warm air which will also rise and explains the improved efficacy of an CO monitor that was elevated. I've seen cigarrette smoke stratify into a thin layer about head-high in a still room. Eventually turbulence will disperse this layer of smoke aerosols. A layer of warm CO-containing air may form just like that smoke layer.
Anyway, my choice for CO monitor location is based on what I've observed in industrial applications, I'll stick with it.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Among the problems of space flight is the fact that people breathe air. Without the normal thermal currents (which rely on gravity) the astronauts end up breathing in the same air that they just breathed out. This leads to local oxygen depletion- particularly when they are asleep and not moving about. This doesn't happen with people back here on earth because the air is never totally stagnant.
If someone farts in a lift you don't need a fan to get it to your nose.
Fitting CO sensors near the ceiling is a better bet simply because CO is generally encountered as a combustion product so it is hot and rises. The point I was making was that a CO sensor near the floor is still better than no sensor.
Of course the best place for the sensor is where people are breathing, and that's not at ceiling level. Children are generally both very susceptible to CO, and near the floor.
Since children don't generally occur inside the cabinets of hydrogen generators this factor might not have been considered in that design. The same might be said of other industrial situations.
What I don't want to have to worry about is someone who's thinking of getting A CO monitor , reads this page and figures that, since the landlord won't let him bolt a detector to the ceiling and "they are no use near the ground because CO floats" he doesn't buy one - so he, and his family die of CO poisoning.
BTW, the hydrogen sensor in our lab used to be carefully mounted at the back of a cupboard at floor level. Go figure.
(BTW, I know it's the landlord's responsibility to ensure the heating system doesn't fill the place with CO. The problem is that not all landlords are aware of this and plenty of people die as a result.)
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
now this is where all boilers, gas appliances etc need to have a failsafe fitted that shuts down the appliance if incomplete combustion is detected, in such a way that it cannot be overridden by the user. keylocking it would probably work (requires a keyfob to unlock it which is only legal to own by CORGI/OFTEC registered appliance repairmen)
A suitably large fine for non compliance and publicity campaign should do the trick here. Maybe send a few uncooperative landlords down for 2 years to get the point across.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
The great French novelist, and political champion of the underdog, Émile Zola (1840 – 1902) is said to have been murdered by carbon monoxide poisoning, on the basis that the flues of his stove were said to have been deliberatley blocked up.
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<OT> CO
