Photonic Radiative Cooling - Revision history

Eric: Added some more links under the "Temporary Trashcan" Section

2023-08-30T04:24:13Z

Added some more links under the "Temporary Trashcan" Section

← Older revision		Revision as of 04:24, 30 August 2023
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	*[https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling The Wikipedia Page On Passive daytime radiative cooling] (One of the many names for this technology)		*[https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling The Wikipedia Page On Passive daytime radiative cooling] (One of the many names for this technology)
	*[https://www.youtube.com/watch?v=8qhgb3vSbTs A Video by the YouTube Channel "School of Energy and Environment City University of Hong Kong" Titled "Passive Radiative Cooling Technology" ] ( '''3 Minute Watch''')		*[https://www.youtube.com/watch?v=8qhgb3vSbTs A Video by the YouTube Channel "School of Energy and Environment City University of Hong Kong" Titled "Passive Radiative Cooling Technology" ] ( '''3 Minute Watch''')

			==Temporary Trashcan==
			*Misc Papers:
			**https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202305734 - Flexible Photonic Radiative Cooling Films: Fundamentals, Fabrication and Applications
			**https://www.pnas.org/doi/10.1073/pnas.1509453112 - Radiative cooling of solar absorbers using a visibly transparent photonic crystal thermal blackbody
			**https://www.nature.com/articles/s41377-023-01119-0 - Photonic structures in radiative cooling
			**https://www.sciencedirect.com/science/article/abs/pii/S0960148117310236 - Performance assessment of a photonic radiative cooling system for office building

	[[Category: HVAC]] [[Category: Optics]] [[Category: Paints]]		[[Category: HVAC]] [[Category: Optics]] [[Category: Paints]]

Eric: Added some more links under the "External Links" section

2023-08-30T04:22:09Z

Added some more links under the "External Links" section

← Older revision		Revision as of 04:22, 30 August 2023
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	=External Links=		=External Links=
	*[https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling The Wikipedia Page On Passive daytime radiative cooling] (One of the many names for this technology)		*[https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling The Wikipedia Page On Passive daytime radiative cooling] (One of the many names for this technology)
			*[https://www.youtube.com/watch?v=8qhgb3vSbTs A Video by the YouTube Channel "School of Energy and Environment City University of Hong Kong" Titled "Passive Radiative Cooling Technology" ] ( '''3 Minute Watch''')

	[[Category: HVAC]] [[Category: Optics]] [[Category: Paints]]		[[Category: HVAC]] [[Category: Optics]] [[Category: Paints]]

Eric: Added a Category to the Page

2023-08-30T02:34:07Z

Added a Category to the Page

← Older revision		Revision as of 02:34, 30 August 2023
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	*[https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling The Wikipedia Page On Passive daytime radiative cooling] (One of the many names for this technology)		*[https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling The Wikipedia Page On Passive daytime radiative cooling] (One of the many names for this technology)

	[[Category: HVAC]] [[Category: Paints]]		[[Category: HVAC]] [[Category: Optics]] [[Category: Paints]]

Eric: Added some more links under the "Internal Links" section

2023-08-30T02:25:45Z

Added some more links under the "Internal Links" section

← Older revision		Revision as of 02:25, 30 August 2023
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	=Internal Links=		=Internal Links=
	*		*[[Cool Roof]] (One of the more Direct Applications of this Technology)
			*[[Hydronic Cooling]] (A more complex, yet controllable utilization of this technology)
			*[[Air Cooled Condenser]] / [[Dry Steam Condenser]]

	=External Links=		=External Links=

Eric: Added some more links under the "External Links" section

2023-08-30T02:14:21Z

Added some more links under the "External Links" section

← Older revision		Revision as of 02:14, 30 August 2023
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	=External Links=		=External Links=
	*		*[https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling The Wikipedia Page On Passive daytime radiative cooling] (One of the many names for this technology)

	[[Category: HVAC]] [[Category: Paints]]		[[Category: HVAC]] [[Category: Paints]]

Eric: Finished the page out

2023-08-30T02:13:10Z

Finished the page out

@@ Line 51: / Line 51: @@
 *110ml (Dry) Acetone+12ml Water +10g Acrylic
 **Acrylic Dissolves over days at stp, hours at ~43*c
-**
+**7g of Pigment for Every 12ml of Paint Solution

Eric: Minor Clarification

2023-08-30T02:01:50Z

Minor Clarification

← Older revision		Revision as of 02:01, 30 August 2023
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	** [https://youtu.be/KDRnEm-B3AI?si=ouhkKThRE9gvgtuK&t=1678 Timecode to the Section of the Video Discussing+ (Partially) Demonstrating This]		** [https://youtu.be/KDRnEm-B3AI?si=ouhkKThRE9gvgtuK&t=1678 Timecode to the Section of the Video Discussing+ (Partially) Demonstrating This]
	*Typical Yield as per their testing: 8g of Microspheres per 10g of Calcium Chloride Initially used		*Typical Yield as per their testing: 8g of Microspheres per 10g of Calcium Chloride Initially used
			** [https://youtu.be/KDRnEm-B3AI?si=pzcEvPgRNbw4ETk7&t=1684 Timecode to the Section of the Video Discussing This]
	* [https://youtu.be/KDRnEm-B3AI?si=JBvrqkbZMGpzy3Ga&t=1658 Timecode to the Part of their Video Where the Screen Shows the Methodolgy Written Down]		* [https://youtu.be/KDRnEm-B3AI?si=JBvrqkbZMGpzy3Ga&t=1658 Timecode to the Part of their Video Where the Screen Shows the Methodolgy Written Down]
	**Loose Notes Derived From the Overall Video + That:		**Loose Notes Derived From the Overall Video + That:

Eric: Saving My Progress Mid-Long Edit

2023-08-30T01:59:14Z

Saving My Progress Mid-Long Edit

@@ Line 14: / Line 14: @@
 *This was Pioneered by [[NightHawkinLight (YouTube Channel) ]]
 *Acrylic Paint in Acetone (To add novel drying feature that causes backscattering, akin to why transparent solids (Salt, Sugar, Snow, Plastics, etc) can appear reflective white)
-*Calcium Carbonate is Synthesized via [[Calcium Chlorate]] (Sometimes sold as [[Deicing Solid]] or as a [[Desiccant]]) and [[Sodium Carbonate]] (often sold as Washing Soda)
+*[[Sodium Citrate]] was originally used as a delaying agent, although [[Citric Acid]] forms this, yet also prevents the formation of impurities so [[Citric Acid]] is used in the latest methodology
-**Dissolves Each in Water, then Combining, this Forms the Pigment, byproduct of Sodium Chloride in Water Solution
+*4-5kg can be made with a [[Paddle Mixer Drill Attachment]] and a Commercial Plastic Trash Can
-**[[Sodium Citrate]] is used as a delaying agent
+** [https://youtu.be/KDRnEm-B3AI?si=ouhkKThRE9gvgtuK&t=1678 Timecode to the Section of the Video Discussing+ (Partially) Demonstrating This]
 **5-30*c temp
 **CO2 + Calcium Chloride = Calcium Carbonate (But in non-microsphere form); this complicates getting just microspheres from the reaction
@@ Line 35: / Line 44: @@
 **Water Washes are done to Remove any Salts etc
 **They made an odd Disposable Metal Baking Pan - Paper Towel - Printer Paper sandwich for the filter/drying step, investigating various other forms of drying that may scale better may be of interest (although kiss / if it ain't broke don't fix it, i guess)

Eric: Saving My Progress Mid-Long Edit

2023-08-30T01:43:48Z

Saving My Progress Mid-Long Edit

← Older revision		Revision as of 01:43, 30 August 2023
Line 15:		Line 15:
	*Acrylic Paint in Acetone (To add novel drying feature that causes backscattering, akin to why transparent solids (Salt, Sugar, Snow, Plastics, etc) can appear reflective white)		*Acrylic Paint in Acetone (To add novel drying feature that causes backscattering, akin to why transparent solids (Salt, Sugar, Snow, Plastics, etc) can appear reflective white)
	*Calcium Carbonate is Synthesized via [[Calcium Chlorate]] (Sometimes sold as [[Deicing Solid]] or as a [[Desiccant]]) and [[Sodium Carbonate]] (often sold as Washing Soda)		*Calcium Carbonate is Synthesized via [[Calcium Chlorate]] (Sometimes sold as [[Deicing Solid]] or as a [[Desiccant]]) and [[Sodium Carbonate]] (often sold as Washing Soda)
			**Dissolves Each in Water, then Combining, this Forms the Pigment, byproduct of Sodium Chloride in Water Solution
			**[[Sodium Citrate]] is used as a delaying agent
			*5-30c temp
			**CO2 + Calcium Chloride = Calcium Carbonate (But in non-microsphere form); this complicates getting just microspheres from the reaction
			***Citric Acid can be used to alleviate this, it produces Sodium Citrate when it reacts with the Sodium Carbonate, is easier to find, and
			*1 to 10 ratio for all solutions:
			**For Example:
			***20g Sodium Carbonate + 200ml Water
			***10g Calcium Chloride + 100ml Water
			***3g Citric Acid + 30ml Water
			**Citric Acid Solution is then Combined with the Calcium Chloride Solution
			*10-20C Pre-mixing
			**Sodium Carbonate is poured into the Calcium Chloride-Citric Acid Solution While Mixed in a Magnetic Stirrer or in a Blender
			**Timer is Started at the moment of Pouring
			**Containers can be cleaned with a mild acid such as food grade White Vinegar etc
			**More Stirring = Smaller Particle Size (In Theory, Upper Limit + QC Needs to be Determined)
			**Allow to Settle, Pour off Waste
			**Multiple Batches of Varying Stirring can be made then combined to get that High Density Pigment. (In the video, they did 3x 1 Minute in Blender, 1x 5 Minutes in Blender, 1/3x 8-10 Minutes)
			**Water Washes are done to Remove any Salts etc
			**They made an odd Disposable Metal Baking Pan - Paper Towel - Printer Paper sandwich for the filter/drying step, investigating various other forms of drying that may scale better may be of interest (although kiss / if it ain't broke don't fix it, i guess)

Eric: Saving My Progress Mid-Long Edit

2023-08-30T01:22:33Z

Saving My Progress Mid-Long Edit

New page

=Basics=
*[[Radiative Cooling]] that uses Technology within the Scope of [[Photonics]] to optimize their function
*Thus rather than a conventional reflective coating (or lack thereof), PRC coatings are added to enhance not just reflectivity, but also produce significant [[Black Body Radiation]] in the Midinfrared, which due to the [[Atmospheric Infrared Window]] goes through most of Earth's Atmosphere, essentially using Outer Space as the Heatsink

=Methods=
==Research Level==
*Multi-Layered Coatings and [[Photonic Crystals]]
**Complex to Fabricate/Apply; Typically similar to [[Semiconductor Fabrication]]
**May be of use for applications where reflectivity is inherently not possible, such as in solar cells according to [https://www.pnas.org/doi/10.1073/pnas.1509453112 This Paper] ( "Radiative cooling of solar absorbers using a visibly transparent photonic crystal thermal blackbody" )
*Barium Sulfate

==High TRL Methods==
===Novel Paint by High Density Pigment using CaCO₃ Microspheres===
*This was Pioneered by [[NightHawkinLight (YouTube Channel) ]]
*Acrylic Paint in Acetone (To add novel drying feature that causes backscattering, akin to why transparent solids (Salt, Sugar, Snow, Plastics, etc) can appear reflective white)
*Calcium Carbonate is Synthesized via [[Calcium Chlorate]] (Sometimes sold as [[Deicing Solid]] or as a [[Desiccant]]) and [[Sodium Carbonate]] (often sold as Washing Soda)