4 ms·

I deployed my own design (not calculated, eyeballed) of a buoyancy based passive cooling at my parents home near Mumbai, India. It did make a measured differenc

I deployed my own design (not calculated, eyeballed) of a buoyancy based passive cooling at my parents home near Mumbai, India. It did make a measured difference of approximately (temperature meters aren't very accurate) 2 degrees Celsius. I have been reading a lot in my spare time and your blog looks like a nice read. My point is, is 2 to 3 degrees Celsius enough? From what I read is that I need to really move very large columns of air to make a sizeable impact. TBF my energy bills did come down by ~10%

dgellow 4y ago
I’m not that familiar with hot temperatures but intuitively I would think that a difference of 2-3 degrees (Celsius) when temperatures are already high at around 40-45 to be noticeable. For example if you go from 40°C to 37-38 that’s a quite good improvement if you don’t have to spend energy for this. I don’t know if that also applies to more extreme temperatures like 47°C, I cannot really imagine how that feels like.
- ianai 4y ago
  At those temperatures heat stroke isn’t far away regardless of humidity. These aren’t temperatures to target 2-3c reductions as a safe goal, either. Ref: lived in LV,NV for a decade.
  - dgellow 4y ago
    From what I understood 2-3°C is not a safe goal but something you can get from the passive cooling solution the initial commenter mentioned. I would guess you can add extra active measures on top?
ianai 4y ago
At some point the thing to do is give people shovels and tell them the roof of their new dwelling has to be at least 2 meters/6 feet below the surface. Or use modern tech.
- ricardobayes 4y ago
  Got a point there, we as a species lived in 'caves' for a long time, it's only the past 2000 years or so we gave up our nice caves/mud houses. In my region in Europe people still lived in straw mudhuts/semi dug-in houses up until 100 years ago. Somehow that became uncool so we deal with modern people problems.
  - mistrial9 4y ago
    "uncool" !@!
- mistrial9 4y ago
  how does this work where there are heavy rains in that part of the world, each year? desert, sure..

dgellow 4y ago

I’m not that familiar with hot temperatures but intuitively I would think that a difference of 2-3 degrees (Celsius) when temperatures are already high at around 40-45 to be noticeable. For example if you go from 40°C to 37-38 that’s a quite good improvement if you don’t have to spend energy for this. I don’t know if that also applies to more extreme temperatures like 47°C, I cannot really imagine how that feels like.

ianai 4y ago
At those temperatures heat stroke isn’t far away regardless of humidity. These aren’t temperatures to target 2-3c reductions as a safe goal, either. Ref: lived in LV,NV for a decade.
- dgellow 4y ago
  From what I understood 2-3°C is not a safe goal but something you can get from the passive cooling solution the initial commenter mentioned. I would guess you can add extra active measures on top?

ianai 4y ago

At some point the thing to do is give people shovels and tell them the roof of their new dwelling has to be at least 2 meters/6 feet below the surface. Or use modern tech.

ricardobayes 4y ago
Got a point there, we as a species lived in 'caves' for a long time, it's only the past 2000 years or so we gave up our nice caves/mud houses. In my region in Europe people still lived in straw mudhuts/semi dug-in houses up until 100 years ago. Somehow that became uncool so we deal with modern people problems.
- mistrial9 4y ago
  "uncool" !@!
mistrial9 4y ago
how does this work where there are heavy rains in that part of the world, each year? desert, sure..