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r/thermodynamics

▲ 3 r/thermodynamics

Can "Cryo Paint" greatly boost the performance of a heat pipe for cooling?

CryoPaint is designed to reflect over 95% of light radiate heat from objects in a band of wavelengths that are transparent to air:

"Radiates Heat to Space: Actively cools by radiating heat directly to outer space via the 8–13 µm Atmospheric Transparency Window"

It claims to make a surface up to 15⁰F cooler than ambient air.

I was wondering what that might do to a heat pipe system for cooling if applied to the radiators.

(Note: posted to Thermal Imaging, which I realize was probably not appropriate to that sub, so I'll delete it there)

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u/Unique-Coffee5087 — 11 hours ago
▲ 1 r/thermodynamics

What way is best for cooling water?

Looking to do a diy ac in my car for a trip, kinda proof of concept to see if it’ll even work.

Would it be best to send water straight to the cooler with ice or got through a pipe?
Personal knowledge says I need to run liquid through a pipe for thermal exchange, what I don’t know is would it even be worth it.

If pipe, should I look for anything other than water or temps not extreme enough to worry about.

Looking to use computer fans with a heater core for the radiator. Haven’t thought about airflow yet, don’t see a problem with it

u/Mlgcrab9 — 2 days ago
▲ 3 r/thermodynamics+4 crossposts

Can anyone debunk it or Bust this Myth

The Right handside arm(RHS) is getting more than 180 degree with momentum after i drop the ball and counter weight is working against gravitational pull back by balancing the mass of lower tube then why it shouldn't work?

(1) I cannot drop the ball once the arm rotate towards left side.IF BALL DROPS FROM THE LEFT HAND SIDE ARM (LHS) THEN THE ARM WILL GET BACK MORE HEIGHT TOWARDS RHS THAN ITS INITIAL POSITION AND VICE-VERSA

BOTH TUBES HAVING EQUAL MASS (230 GRAM)

(2) anyone can try it as it will work even with dead material.

(3) INTERESTING point is arm is getting more height once I increased the counterweight.

(4)Hand power or force is nothing in this design.

https://www.youtube.com/watch?v=gO0PwRZBELQ&pp=ygUfZXhwZXJpbWVudCBwaHlzaWNzIHZpa3JhbSBndXB0YQ%3D%3D180

u/Suspicious-Row2985 — 4 days ago
▲ 4 r/thermodynamics+3 crossposts

how a gas turbine works

i have to do a test about engines including gas turbines and diesel/petrol and more… i found yt videos explaining them but i couldn’t find one that’s great at explaining gas turbines. will anybody please explain to me how a gas turbine works??(pls don’t use professional words since im just a korean student🥺

u/Leftygoodbrother — 3 days ago
▲ 0 r/thermodynamics

Why do we believe that entropy in the universe must always remain constant or increase?

Seems like staring at the corner or pixel of the mona lisa and seeing that it's blue so assuming the whole thing is blue. Also not a very good representation it seems like the earth is a pretty good example of entropy decreasing I get it's not a closed system but it does seem to show that entropy can decrease seams posible that it could do this in a diff context. (anyway studying for the MCAT and the always statment was bothering me always to me it seems like we have no idea and just like to think we know what is happing.

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u/Straight-Kiwi7319 — 5 days ago
▲ 5 r/thermodynamics+1 crossposts

Would a large window affect room temp?

Hello! Turning to reddit for an educated answer on a topic that has been an ongoing debate between my SO and I. In a room (20' x 16') with a large eastern facing window (92" x 34"), would the sunlight coming in affect the ambient temp of that room once the sun has come around to be directly shining on it, even if the window itself has UV coating?

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u/Affectionate_Act_186 — 6 days ago
▲ 5 r/thermodynamics+1 crossposts

Quelle configuration pour une meilleure performance clim ?

Bonjour à tous,

J'ai une clim avec une PAC installée sur mon balcon depuis quelques mois.

Elle ne fonctionne que très rarement, mais beaucoup plus fréquemment depuis la canicule.

Je me suis rendu compte qu'elle rafraîchi beaucoup moins bien ces derniers jours, je pense que c'est liée à la configuration de mon balcon, et aux températures caniculaires.

J'explique : mon balcon possède 3 porte fenêtre coulissantes qui donnent sur l'extérieur, elle font chacune environ 120x250 cm chacune. (voit schéma joint)

Le soucis c'est que je ne peux ouvrir que sur la largeur d'un seul élément en simultanée, qui fait une ouverture cumulée de 120x250 max.

Je peux ouvrir la moitié du P1 et la moitié du P3 par exemple.

Mon balcon est orienté ouest, et j'ai bien 4 à 6 heures d'ensoleillement direct sur l'unité extérieure.

J'ai pensé la protéger par une canisse sur le garde corps extérieur pour la mettre à l'ombre, mais je me dit que cela réduirait encore plus la surface d'apport d'air neuf.

J'essaie d'identifier la meilleure configuration, pour les ouvrant P1 à P3 pour optimiser la circulation de l'air dans le balcon, et obtenir le meilleur rafraîchissement possible.

La température de la sonde intérieure indique parfois 45 à 48°, et je me dis que la clim doit bien souffrir dans cet environnement semi clos.

En plus j'ai des stores pour protèger du soleil qui sont en 1/3 - 2/3

Sauriez vous me conseiller sur la manière d'ouvrir les coulissant pour que l'air circule de manière optimale et que je puisse obtenir le meilleur rendement possible ?

u/9na9ela — 7 days ago
▲ 0 r/thermodynamics

why are people putting thermal paste performance in W/mK

why a watt divided by a meter times kelvin, it makes no sense, ahouldnt it be W/m^2K a single meter is not saying anything, is this a simplification? or did someone mishear it?

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u/Anastazja_Nya — 8 days ago
▲ 7 r/thermodynamics

How could I best direct air for cooling in my apartment?

Hey all!

In the quest to cool my apartment this summer ive been trying to get a grapple on basic thermodynamics so I can absolutely change my sweaty bfs and my life for the better. I understand that hot air goes out and so I have tried using the open window with box fan facing out solution (detailed in attachment) but feel like its not working and I struggle to feel like I’m not letting more hot air in because the top of the window is not covered by the fan?

I have also tried to get hot air out from the bedroom to be cooled in the living room by the AC unit by propping a fan up high a yard from the doorway in the bedroom facing the hallway (not pictured). And using my tower fan on the floor facing in to blow cooler air into the bedroom, but I feel like because of the HORRID hallway/foyer set up air doesn’t even travel from the living room as it all gets negated by my front door.

Never posted on reddit but I’m desperate for some assistance, I am super open to learning more complex details about this as I am a big hobbyist and nerd. I know that the realistic recommendation is probably just get another air conditioner, but I don’t have the money right now; if you can think of a way my current objects can make a helpful change I would be grateful! Im not looking for like 15 degrees cooler but anything will help!!

TLDR; apartment layout from hell. Look at my layouts, tell me what you think could cool the apartment (especially bedroom) better, with my current unit and items.

u/Opening-Village-5290 — 7 days ago
▲ 8 r/thermodynamics+1 crossposts

Can I move the cold air from the living room AC to bedroom using 2 fans like this?

u/Mostuu — 11 days ago
▲ 4 r/thermodynamics

Could self-replicating systems emerge because they increase access to otherwise isolated free-energy reservoirs?

I have been wondering whether life could belong to a broader class of non-equilibrium structures that may become statistically favored under certain conditions because they increase access to otherwise isolated free-energy reservoirs.

A rough analogy came to mind.

Without self-replication, imagine a fire burning an isolated pile of dry wood. The stored chemical energy is released, entropy increases locally, and the process eventually ends.

Now imagine that a small fraction of the free energy released by the fire is not immediately dissipated as heat, but is instead used to produce long-lived, self-propagating 'embers' (or, more generally, self-propagating carriers of stored free energy), that retain enough stored energy to travel beyond the initial site of combustion. Some of these 'embers' eventually reach distant piles of dry wood whose stored chemical energy would otherwise remain inaccessible over the timescales considered, igniting new fires. These new fires, in turn, use part of their own released energy to generate additional 'embers' capable of reaching even more isolated fuel reservoirs.

The total amount of available free energy in the environment remains unchanged, and the final equilibrium state may ultimately be the same. However, the number of accessible entropy-producing pathways, as well as the cumulative entropy production rate over finite timescales, may increase substantially.

This made me wonder whether self-replicating systems could simply be one member of a broader class of dissipative structures that statistically increase the accessibility and connectivity of free-energy reservoirs.

If so, perhaps life need not necessarily be viewed as requiring exceptionally fine-tuned circumstances to emerge, but could instead be understood as a possible consequence of certain non-equilibrium environments in which self-replicating carriers of stored free energy increase the number of future entropy-producing trajectories available to the system.

I am not proposing this as a theory, but I am curious whether similar ideas already exist in statistical physics, non-equilibrium thermodynamics, dissipative adaptation, or abiogenesis research.

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u/Sakouli — 13 days ago