9 ms·
Seems like a lot of work. Greenhouses sometime need shade so we coat them in 50lb bags of Hydrated lime (Calcium Hydroxide) which can be purchases for really ch
by wessorh 3y ago
Seems like a lot of work. Greenhouses sometime need shade so we coat them in 50lb bags of Hydrated lime (Calcium Hydroxide) which can be purchases for really cheap. While I enjoyed the video when I have thousands of squarefeet that need coverage hydrated lime works great.
- retrocryptid 3y agoHydrated lime doesn't cool the reflecting surface below ambient.
- 01100011 3y agoBut it turns into CaCO3 after absorbing CO2 from the air, no?
- OlympusMonds 3y agoYeah, but making lime is very energy intensive.
- mrob 3y agoIf the lifetime energy savings are greater than this energy cost then it's still a good idea. You only need a thin coating so it sounds plausible to me.
- retrocryptid 3y agoDid you read the paper?
- littlestymaar 3y agoWrong thread? (because there's no paper being discussed in this one…)
- retrocryptid 3y agoScroll up. Find the reference to the paper. Click on it. Read it.
- littlestymaar 3y agoBad bot
- deleted 3y ago[deleted]
- elmolino89 3y agoThe input substrate to produce CaO is CaCO3. This requires a lot of energy, often obtained by burning coal and the reaction releases CO2. Absorbing CaO/Ca(OH)2 makes sense only in systems like submarines/bunkers with no external air supply. As a CO2 capture method on a large scale is makes no sense. Even if we think about using CaO as some "CO2 capture and release" material with who knows, storing pure CO2 underground, I think even theoretical no CO2 emitting energy needed for baking CaCO3 has a better use.
- 01100011 3y agoWhat? Did you respond to the wrong comment? Can you tell me what you think my comment is trying to say?
- soligern 3y agoSeems like a lot of work to do yourself but if made commercially there’s nothing in the process that would make the end product very inexpensive either.
- fullspectrumdev 3y agoYou say that, but in chemical engineering stuff like this is always a LOT harder to scale than you would think :(
- rabf 3y agoA well applied lime wash is something more people should be aware of in the modern world. If you live in an old stone building it is what you should be using for exterior stonework and not modern paints!
- _jplc 3y agoTested and proven during centuries https://en.wikipedia.org/wiki/White_Towns_of_Andalusia https://en.wikipedia.org/wiki/White_Towns_of_Andalusia
- elmolino89 3y agoIt is not the problem with lime vs another white paint outside of the buildings. Modern paints based often containing TiO2 are more durable. But I am with you that using lime especially on roofs/sun exposed walls (assuming lime does not eat up some materials) before summer is sensible if done correctly. Otherwise we will have a spike in hospital admissions of ppl splashing lime over themselves.
- rabf 3y agoModern paints are often not breathable causing moisture to get trapped in the walls causing no end of problems to historic buildings.
- elmolino89 3y agoGood point. Indeed such impermeable to even water vapor paints peal off/cause the damage to bricks/stones under.