/sci/ - Science & Math

[Anonymous No.11628511]

to generate heat in a room
>buy a $20 wall heater
>plug it into the outlet
>push the button

to generate coolness in a room
>buy a massive $300 AC unit that can only be mounted to a window by screws and insulation foam
>turn the dial
>starts blowing out your eardrums with how loud as fuck it is
>thousands of stinkbugs climb into your room through the cracks in between the window and the air conditioner since window frames aren't perfect rectangles

How the hell haven't they invented an air conditioner that doesn't require a window at all? I never hear about heaters having to "remove" the cold air from a room, but ACs need to remove hot air? bullshit

[Anonymous No.11628523]

>>11628511
Cold doesn't exist. That's why. You can't generate cold. You can only generate hot. Cold is the absence of hot, in order to generate cold you have to remove hot from a room.

[Anonymous No.11628530]

>>11628523
you can remove heat from a room by blasting a strong enough current of cold air into the heat in the room

[Anonymous No.11628560]

>>11628511
Temperature on room is basically energy of the air
You can easily add energy from electricity, but removing that energy is much harder
It's called entropy or something

[Anonymous No.11628582]

>>11628530
As far as I know you can't generate cold, I don't know how to explain it now but I once heard that cold is just the absence of hot.

[Anonymous No.11629065]

in order to produce cold air you must produce hot air
in order to do pretty much anything you must produce hot air and that's why the ozone layer is absolutely fucked

[Anonymous No.11629119]

>>11629065
>in order to do pretty much anything you must produce hot air and that's why the ozone layer is absolutely fucked
lmao

CFCs are not hot air.

[Anonymous No.11629140]

>>11628511
just tape reflecting blankets to your window

[Anonymous No.11629173]

>>11628511
>to generate coolness in a room
Open a fucking window because I don't live in Africa and It's always freeze cold here

[Anonymous No.11629183]

>>11628511
buy a minifridge and leave its door open

[Anonymous No.11629251]

>>11628511
What AC really needs to remove is not just hot air, but also moisture. This is part of the reasons AC is called air conditioning instead of just cooling. Early cooling systems which mostly just fed cold water through the same radiators used for heating created humidity problems and would range from feeling very chilly to much worse than a good fan.

Window AC are further constrained since they cant just send the moisture down the drain so it has to leave with the exhaust. Although I am sure many just drip. This exhaust is even heated so it will wick away more moisture. Since there is an exhaust, there must also be an intake from outside the room to replace the lost volume indoors.

And of course I have been glossing over how the AC is actually a heat exchanger, it cant cool anything without heating something else up as everyone else has mentioned. Although if we could I am not sure that would change AC systems very much because of the moisture problem. So we get the following process. The AC intakes hot humid air from the outside, cool it below room temperature to extract the moisture through condensation and send the cool dry air into the room. The moisture is then sent to the exhaust which is actively being heated above the outdoor temperature to cool the intake and use it to get rid of the moisture.

[Anonymous No.11629257]

>air is hot because it has more energy
>humans feel this energy as temperature for whatever reason, it doesn't matter
>first law of thermo says that all you need to do to heat up gas is to do some kind of work on it
>unfortunately, second law says hot air can't do work on its own, you need a colder reservoir
>heat pumps/refrigerators do work (expand and compress) a special fluid in a cycle to absorb heat in the region you want to cool, and to release it into the hot reservoir
tl;dr: there's no such thing as cold and the second law of thermodynamics says that you NEED two reservoirs to cool something. this isn't true for heating.
>>11629183
no lmao

[Anonymous No.11629262]

>>11629183
this.
>>11629257
take your meds

[Anonymous No.11629268]

>>11629262
the furry has a strong grasp of thermo and fluid mechanics, you probably haven’t lurked enough to have seen their prolific contributions to /sqt/ and any thread dealing with these kinds of questions

[Anonymous No.11629273]

>>11628511
kek.
Yeah, well.
The Hair Dryer is 100 years old today, and there's still no solution to no have them hooked on a cable.
Thermodynamics is a bitch.

>but ACs need to remove hot air?
The axiom of choice should generally be rejected as an axiom.

[Anonymous No.11629277]

>>11629268
tl;dr: take your meds.

[Anonymous No.11629283]

>>11629277
>1588447411189s

[Anonymous No.11629301]

>>11628511
>How the hell haven't they invented an air conditioner that doesn't require a window at all?
They have moron, great thread

[Anonymous No.11629305]

>>11628523
fpbp

[Anonymous No.11629325]

>>11628582
Ah like trying to generate darkness.

Wait then what are fridges and fridge freezers for 200$, John?

[Anonymous No.11629338]

>>11629325
this is a mildy schizophrenic post

[Anonymous No.11630222]

>>11629325
You do realise the back of the fridge is hot right, the heat is moved it doesnt disappear

[Anonymous No.11630270]

>>11628511
The real funny part is that when I use my heater it is a smaller temperature difference compared to cooling the room. For example I don't need an AC at 70f and my location rarely gets 100 degree days. So that is 30 f difference. Now we often get days below zero every winter. So that is a 70 degree difference!

[Anonymous No.11630304]

While not a solution to your /sci/ problem, the solution to your /diy/ problem is to get a mini-split instead of a white trash window AC.

[Anonymous No.11630309]

>>11630304
What it it's an apartment?

[Anonymous No.11630318]

>>11628523
how does a refrigerator work than, you absolute fucking braindead math studying nerd.

[Anonymous No.11630320]

>>11629325
A fridge takes the hot air inside of it and pushes it outside, if you leave the door of a fridge open while it is on you will begin to notice that the room is getting warmer because of the motor constantly trying to move hot air that is immediately being replaced by more hot air.

[Anonymous No.11630334]

>>11629257
stfu you shizo

[Anonymous No.11630349]

>>11630309
Get a better apartment.

[Anonymous No.11630635]

>>11630320
The room will get warmer even if the door is closed

[Anonymous No.11631101]

>>11630320
yea... except in the fridge there is a fluid that carries the heat from front to back and from up to down. it is obvly not water. but it is some sort of pump.
you can use chemicals to cool stuff down. keyword is "instant freezing packs ammonium nitrate".

[Anonymous No.11631125]

>>11630320
>>11631101
Refrigeration is based on a cycle using a fluid with desirable enthalpy properties termed refrigerants. It doesn't just pump air lmao

[Anonymous No.11631151]

>>11628523
Bold of you to educate /polsci/ on basic physics

[Anonymous No.11631293]

>>11630318
>A refrigerator (colloquially fridge) consists of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from the inside of the fridge to its external environment so that the inside of the fridge is cooled to a temperature below the room temperature.

First fuckin line on wikipedia you dolt.

[Anonymous No.11631589]

>>11628523
and that student was albert einstein