Green Building Bible, Fourth Edition |
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These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
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Posted By: wholaaGiven that ventilation is shown to have a major impact on the transmission of covid19
how is this seemingly never ending corona crisis going to impact domestic ventilation?
Could the crisis undermine confidence in this near essential greentech?
Can domestic MHRV filter covid 19?
Posted By: Ed DaviesThe second can only make the situation better, I'd thinkWhat about my point that
Posted By: fostertomthe 2m rule applies to still air; ventilation at least increases turbulence, if not clear airsteams; will greatly increase the radius and duration of risk of encountering others' droplets, spread the droplets all around the roomI'm not one to knock ventilation, but pointing out why it's not an unquestionable positive with this virus - it deserves some 'scientific' thought. Cliff Pope has made a start, in defining how ventilation might need to be, to not actually be counter productive.
Posted By: fostertomWhat about my point that … the 2m rule applies to still air …I'd suggest the flow rates caused by ventilation are very small compared with other natural air movements, e.g., convection caused by a “radiator”.
Posted By: fostertomBut still, dilution also negligible or v slow. 3a/c/hr means it takes an hour before only 25% of the original air is still left.
Posted By: tonyTime exposed is an important factorI guess it's time exposed x concentration, but neither quantity linear.
Posted By: fostertomIt's incredible that after all this time we're still really unclear about these things - it's not rocket science, and not subject to changing scientific discovery.Isn't that because of these politics? Why else are we so confused? Even the Grenfell Inquiry has reached the point where it can't help mentioning the politics behind it.
Posted By: fostertomIt's inconsistent to say that "the 2 meter rule is quite effective" despite being no protection against aerosols;
and "masks ... doesn't work so well" because they don't stop aerosols.
Both the 2m rule and masks are only supposed to help with droplets, can't help with aerosols. Maybe one is "quite effective" and the other not - I'd like to understand why.
The 2m rule protects both parties but masks only marginally (if at all) protect the wearer but are to protect others. Maybe that's it?
it's incredible that after all this time we're still really unclear about these things - it's not rocket science, and not subject to fchanging scientific discovery.
Posted By: fostertomIt's inconsistent to say that "the 2 meter rule is quite effective" despite being no protection against aerosols;
and "masks ... doesn't work so well" because they don't stop aerosols.
Both the 2m rule and masks are only supposed to help with droplets, can't help with aerosols. Maybe one is "quite effective" and the other not - I'd like to understand why.
The 2m rule protects both parties but masks only marginally (if at all) protect the wearer but are to protect others. Maybe that's it?
It's incredible that after all this time we're still really unclear about these things - it's not rocket science, and not subject to changing scientific discovery.
Posted By: fostertomMy guess is that the first minute of exposure (at constant concentration) is much more significant than the tenth, i.e. exposure for 10mins is far less than 10x as dangerous than exposure for 1min. If you've been exposed for 10mins then exposure for an hour is hardly any worse. Or am I wrong?but I think you're saying the opposite is true - there is non-linearity but in the opposite sense.
Posted By: JontiI think that the facts on social distancing are actually really very clear but it seems that they are also inconvenient to many.The rule is clear, and not resisted or 'inconvenient' to me. But the thinking or science behind it bears a lot more exploration.
Posted By: fostertomBut still, dilution also negligible or v slow.Perhaps, but people do say that with mechanical ventilation the air feels better so I'd think that indicates dilution works better than with just “natural” ventilation.
Posted By: fostertomI thought that inhaling just one or two viruses would be the danger, and that inhaling ten times more would make little difference
Posted By: fostertomI thought that inhaling just one or two viruses would be the danger