3 ms·

There are multiple "cool roof" products already sold in India. They should have lower performance than the 3M film, but also much lower cost. I wonder if there

There are multiple "cool roof" products already sold in India. They should have lower performance than the 3M film, but also much lower cost. I wonder if there's an low-cost additive that could give these existing products high emissivity in the atmospheric IR window? https://www.youtube.com/watch?v=VeZDrFqJcj8 https://www.youtube.com/watch?v=VeZDrFqJcj8 https://www.panachegreen.com/high-sri-coatings/cool-tops-premium/ https://www.panachegreen.com/high-sri-coatings/cool-tops-pre... https://thermacool.in/ https://thermacool.in/

mensetmanusman 4y ago
Have to consider performance cost per unit time. Usually low cost options have to be replaced so quickly to actually have an impact that they are actually more expensive.
- schiffern 4y ago
  You still need to consider up-front affordability. A product could have high net present value, but if you don't have enough money to purchase it then the product might as well not exist. >Usually low cost options have to be replaced so quickly to actually have an impact that they are actually more expensive. I don't think that's what's happening here. You're comparing a product from 3M that's at the "fill out this form for a pilot project and we'll contact you" phase, whereas the Indian products can be bought by the bucketful, today. Some of these coatings have real-world service lifetimes of 5-8 years. How does this compare to your preferred 3M film?
  - mensetmanusman 4y ago
    Yeah, unfortunately it is so new that the information doesn’t exist for exactly this material: https://arpa-e.energy.gov/technologies/projects/passive-radiative-cooling-film https://arpa-e.energy.gov/technologies/projects/passive-radi... Describes the arpa-e funding https://www.startribune.com/can-a-new-3m-technology-help-climate-proof-our-buildings/600155409/ https://www.startribune.com/can-a-new-3m-technology-help-cli... Shows the fruits of the research already reducing energy usage by 10% for supermarkets in a cold climate… Anyway, exciting future!

mensetmanusman 4y ago

Have to consider performance cost per unit time. Usually low cost options have to be replaced so quickly to actually have an impact that they are actually more expensive.

schiffern 4y ago
You still need to consider up-front affordability. A product could have high net present value, but if you don't have enough money to purchase it then the product might as well not exist. >Usually low cost options have to be replaced so quickly to actually have an impact that they are actually more expensive. I don't think that's what's happening here. You're comparing a product from 3M that's at the "fill out this form for a pilot project and we'll contact you" phase, whereas the Indian products can be bought by the bucketful, today. Some of these coatings have real-world service lifetimes of 5-8 years. How does this compare to your preferred 3M film?
- mensetmanusman 4y ago
  Yeah, unfortunately it is so new that the information doesn’t exist for exactly this material: https://arpa-e.energy.gov/technologies/projects/passive-radiative-cooling-film https://arpa-e.energy.gov/technologies/projects/passive-radi... Describes the arpa-e funding https://www.startribune.com/can-a-new-3m-technology-help-climate-proof-our-buildings/600155409/ https://www.startribune.com/can-a-new-3m-technology-help-cli... Shows the fruits of the research already reducing energy usage by 10% for supermarkets in a cold climate… Anyway, exciting future!