Heat Transfer: Crash Course Engineering #14

[@charlieangkor8649]

i actually live in cambodia and this is how i do it: two open windows with mosquito net and a fan blowing air between them. reverse according to which side of the house receives sun. im directly under flat roof which gets super hot from full sunlight so hot that just the radiant heat makes my desk hot while the air is not. and this is the only thing that keeps the room comfortable. the roof receives about 700 megajoules per day. when the heat is the worst i dump water buckets on the roof which evaporate quickly. one bucket reduces this by 40 megajoules. so 18 buckets eliminate the sunlight completely. a rack with wet clothes inside the room also helps obviously.

[@jamespenny9482]

This subject adapted to the kitchen is so needed: there a lot of cooks who don't seem to understand the basics of heat transfer, for example a veggie pizza with all the veggies dumped in the center results in a puddle of water in the center, and all the toppings sliding off. The veggies need to be spread out to the edges. The same goes for the sauce, it does no good to just slap the sauce on carelessly and have the edges burning up and the center soggy.

[@helenday5031]

Thank you for the nice, interesting pictures. I find that learning hard things is SO much more pleasant and less stressful (and so I learn better) when it's in bright, lively colour.

[@1mijaz]

instead of reviewing my class notes i am gonna use this to pass my job interview.

[@1mijaz]

i got the job btw, and this helped

[@KaleidoscopeWillow55]

@@1mijaz niiiice

[@denizsenen1082]

1mijaz good job bro

[@gamezonedaily_]

1mijaz what job interview did you get 😂😂😂

[@1mijaz]

@@gamezonedaily_ Project Engineer at a heat exchanger manufacture

[@camiloiribarren1450]

Once again, back to physics and thank goodness I am refreshing this

[@YYY-yd9qn]

This is a great review for architecture students, especially with the examples used

[@bobbyoneal9440]

The Metal Gear Solid reference made my day!

[@yondaime500]

Heat conduction is a major hassle for thermoelectric coolers. The idea is pretty interesting, a cooler without moving parts, just pass an electric current through and it transfers heat from one face to the other (you can even reverse it by inverting the current). The problem is that you need a material with good electrical conductivity, otherwise it's going to generate a lot of heat due to the Joule effect. But good electrical conductivity generally implies good heat conductivity, so the material transfers heat back from the hot face to the cold face, like trying to fill a bucket with a sieve. That's why thermoelectric coolers are much less efficient than compressor-based coolers, although researchers keep finding better materials to improve performance little by little.

[@ArawnOfAnnwn]

So you want something with good electrical conductivity, but bad heat conductivity? Umm...water? Not distilled, of course.

[@olevansanten4750]

@@ArawnOfAnnwn well isn't water quite good at heat conduction. For example try grabbing a hot oven plate with a wet glove on, you'll burn yourself a lot more then, if it was dry

[@aaravchoksi1564]

I didn’t read anything

[@EHBRod13]

WHERE WERE YOU WHEN I TOOK HEAT & MASS TRANSFER?!?

[@EvanMoon]

Thank you for breaking it down for us. We have an RV and we are trying to help the small air conditioner during the summer. We cannot put more insulation on the inside but we can put something to block the direct sunlight from contacting the top of the RV

[@marsluren1610]

I love crash course. Thank you a million times over

[@rawanxy7396]

Thank you for this engineering series please expand I need more videos before I graduate haha

[@bruce-le-smith]

Nice rapid pace to this video, thank you!

[@hedgehog3180]

Plate heat exchangers are almost unbelievably efficient. A small one maybe 20x10x5 cm can easily heat up water from 10 c to 30 c at incredibly high flow rates. It can essentially ensure that a house will never run out of hotwater because it can produce it so quickly that you can get hot water for every appliance and the shower in a home. Having lived my entire life with one I was stunned at the concept of running out of hot water when I heard about it.

[@engibear6392]

*I hear tell of quadruple-pane windows with special coatings that reflect the infrared and ultraviolet parts of the spectrum so that the only radiation that makes it inside your house is useful, visible light.* *Use solar panels to catch everything that would otherwise be hitting your roof.*

[@MrJuuustin28532]

The most awesome KZbin series out.

[@Zoms101]

Liked the MGS reference at 1:42.

[@shompakhan783]

Please do a video on aeronautical engineering... I really love aeronautical engineering and I really want to become an aeronautical engineer in future.

[@Say_Watt]

Can you guys at crash course do a geology course? Love your videos so much by the way they are so fun and educational

[@glados2788]

0:50 I freaked out because I was watching at night and I thought someone screamed

[@gabriellaacloset]

GLaDOS lol

[@hannahsummers7956]

lol omg

[@add879xd9]

Same

[@octavios.5448]

lmao

[@layyah59]

Omygosh lolll

[@sivaneshm8306]

Hi dear... Your videos are so much useful for me and others..... Please keep uploading videos....... Thanks a lot...... Hats off to you a your team.... God bless you dear ✨✨✨✨

[@KZNJay]

PBS always Admires me !

[@galazanugrah5900]

I am an architect in a beautiful tropical country of indonesia . Found this very helpfull, although I've hear it from highschool but it's just go by cz there is no case to solve

[@michaelquintana692]

oh my God I died a little when I saw Solid Snake moving inside the box

[@safwanali.a]

wow what an excellent video amazing!

[@rkpetry]

*_...please, simplify this for physicists:-heat transfer is by photons exchanged by atomic orbital electrons, certain materiels might have slower or even 'uphill' heat flow, directed magnetically, or by reflection on smooth inner surfaces, or, per your title, transferred by Fermi-level-conduction-band electrons and-wait for it-not mongols, but-'free holes'... (which'd be 'solid' convection, except, it's at bulk-temperature, so-what, type, is, that)... ((and then there's Mach-Principle groundstate-minimum-oscillatory-energy 'sharing'))..._*

[@peka2478]

i understood some of those words... ^^

[@samuelfandrade]

Radiation has more to do with the heating than conduction itself. If you create a radiant barrier, you will minimize the heating of the walls, and then will not need thick layers of other insulations, or walls for that purpose. If you read about MLI from NASA you will see that radiation is the main focus on space, as it should be on Earth, since the heat source is the same. (the sun).

[@samuelfandrade]

Im talking about how it impacts buildings, as it is on the video, real life situations.

[@zacharyscott8083]

Ayy I see you throwin’ shade at h3h3 at 4:28

[@eddietorres3723]

Saw that too! We gotta get ethan to see this

[@Bobby.B619]

People wear beanies too lol

[@PeaceEcho_]

Saul Goodman shut up

[@danieldanieldadada]

4:12 transfer* I'm so good at this

[@canyadigit6274]

dan iel transfer*

[@danieldanieldadada]

tranz ferdinand

[@canyadigit6274]

dan iel transfer***

[@danieldanieldadada]

LGBTransfer

[@canyadigit6274]

dan iel transfer****

[@jonathangarcia2337]

I remember this was the first thing I learned when learning hvac

[@mikenewbold4753]

well done!

[@upadhyaynsdesireeducation2106]

Amazing Fantastic Spectacular Explanation Ma'am! PROUD OF YOU!

[@pandine9390]

Could you please talk about SSD (somatic symptom disorder)?

[@АлександарПетровић-в4ю]

In medical physiology we study same principles, difference is how our body solves the problem, but even then the mechanisms are same.

[@JakeKun101]

an absolutely remarkable thing

[@hm-mt3wj]

Is that Wall-e on the shelf?

[@DOOMANVR]

yes

[@TrinsRealm]

When one is near a fire. Is it convection that makes the air around hot or radiation? Probably both but which is more responsible?

[@revinaque1342]

Radiation

[@6alecapristrudel]

Smoke and hot gasses from combustion rise due to thermal convection heating the air along with them. If you were to feel the actual hot air from the fire you'd know it very quickly lol. When sitting around it normally all you're feeling is radiation, which doesn't really have much to do with air being hot since it's photons.

[@tuseroni6085]

it seems like convection is just conduction of a moving fluid. i mean the heat follows the same principal, it goes from areas of higher energy to areas of lower energy, the heat from, say a house, moving to the air around it and causing it convect, still has the heat conducted to the air from the house and then from that air to other air and so on causing the convection. seems like convection should be a special case of conduction and there should only be conduction and radiation.

[@dustman96]

I've had that thought before, interesting...

[@sourmango4760]

both are dependent on particles so yeah in a sense they are basically the same thing, but they have very different properties even though they share very similar principles

[@nopoint313]

Well like she said, at the boundary layer of a fluid as it meets a solid, it essentially is conduction occurring due to the lack of movement of the fluid. The motion of the fluid is what sets convection apart from from conduction. With conduction, the primary factors influencing heat transfer are the thermal conductivity, surface area, and the temperature difference. However with convection, the motion of the fluid drastically affects the heat transfer coefficient. Natural convection vs forced convection will result in different heat transfer rates. This is why you must analyze them separately. Solids transfer heat differently than fluids.

[@debojitacharjee]

What is heat radiation and is it like electromagnetic radiation? Heat can transfer in vacuum also but how? When anything is heated then its molecules vibrate rapidly but why anything that comes near that object also heats up? Is it something like electromagnetic radiation?

[@cosmic5244]

METAL GEAR????? 1:44

[@MikesMovies]

Question, if I have a fixed heat source downstairs in an extension, how can I best cause the heat to move upstairs?

[@tommy0773]

So to battle the radiant heat put an reflective aluminum barrier on top of your existing insulation put a solar fan on your roof ( because we’re trying to save energy) to force ventilate and pull the heat out in the summer . Now insulation has a saturation point just like a sponge can only resist or absorb so much water , insulation can only resist or absorb so much heat before it becomes ineffective the saturation level is usually around 125degrees f so it seem that if I can add a reflective barrier on top of my insulation it would keep my insulation protected from radiant heat and my insulation would not reach its saturation point hmmmmm I feel a science experiment in my near future!

[@hishamzia4111]

Please do Aeronautical Engineering

[@thecake2373]

The shelf is giving me anxiety. Lasted 2 minutes. That’s good enough right?

[@dan1204hc]

You can work and research Heat Transfer following the career of Chemical or Mechanical Engineering.

[@donedeal00051]

1:47 Doctor Zodberg image 😃

[@KaleidoscopeWillow55]

zoidberg* and ok?

[@trevorchristie7505]

My teacher made me watch this

[@caionascimento4234]

What a beautiful accent!

[@Justfootball9]

Exchange of contributions

[@peternguyen9599]

lmao that metal gear solid reference

[@jjuliapurba]

I like it

[@toobnoobify]

You managed to take a fairly straight forward high school physics topic and make it even more complicated than reading a boring textbook. How is that possible?

[@account-not-found-try-again]

In between glass, vacuum or less heat conductant gass than oxygen..

[@salmanhaidr]

So convection is a special type of conduction?

[@LUCKY-1-1-]

I love cc but i rlly would like to know about ocd because i have it ;(

[@acceptablecasualty5319]

Guys, be careful. I think i saw a Snake...

[@akiohiro7112]

where?do tell

[@Libbysvideodiary]

What time ?

[@roguejr7852]

Akiohiro he means snek at 1:40

[@checkpointstore1]

perfect insulation would be a 100% vacum right?

[@fayemandel9205]

Happy birthday john green

[@sheepbow909]

1:40 I am snake You never saw me

[@ScottKorin]

If heat transfer always moves from a higher temperature to a lower one, does that mean I'm not "air conditioning the outside" when I leave the front door open? See, Mom! I told you!

[@mohamedmagdy-xu2yu]

God I love heat transfer hope one day to design my own house with two layers of concrete walls with a fiber glass insulation between them with a 5 meter hight top and a buried water tank for cold water and one on the top of the house for hot water instead of cranking up the AC all the time I HATE ACs

[@muhamadsyahdanprabu5809]

2:46 what about the roof ? does taller building make the heat transfer lesser?

[@alphagaming9361]

I typed grade 7 heat transfer and got this, i clicked on it as it was crash course after 5 mins i am like , wwwwwhhhhhhaaaaaa? Bcos this was bout engineering and i am just at grade 7, anyway i really like crash course

[@universalspider8984]

I would still feel cold becuz my arms are bare XD at 4:29

[@whatbrettdid]

Little H3HE reference

[@lazarorafaelpupo-dominguez5146]

Ashoka comes to kind.!

[@amo6139]

more like yeet transfer

[@katherina6843]

yes

[@legixx6954]

Evaish ROBLOX gaming Yeet

[@hannahsummers7956]

she never stutters. wow.

[@Marixandra0]

Thanks for being ho- helpful with this tutorial🥵

[@joshuastyles9936]

i watch them

[@georginacortes4579]

HOLA

[@acceptablecasualty5319]

Let me tell you- coolimg is a lot harder than heating.

[@Aluve-s4s]

the shelf behind her is bothering me i keep thinking its going to fall lmao

[@khalilaa1997]

calculate nusselt number

[@eddietorres3723]

4:20 h3h3

[@jjc5475]

You forgot to mention that this seemingly isn't needed for schools because **** kids.

[@pitchapatpisitkun2417]

Lol that snake reference

[@nottsk2006]

4:20 Ethan from h3h3

[@anthonywest5788]

looooool

[@JaredFrasier]

Shifty shelves...hurt

[@nick23900]

I came here to see if this video could help me understand what the hell is going on in my heat transfer class. I did not expect to see such a beautiful lady. Where is she even from lol

[@jacebelanger7031]

thats alot of subs she has

[@irwainnornossa4605]

It's better to live in cooler areays anyway. Tropical island? No. Everything produces heat. That heat needs to go somewhere. Where it should go, when the air is already hot? It would be really nice to have some way how to force atoms to give up their thermal energy in form of ratiation. So you could basically force air to radiate and cool down. And before someone tells me about entropy, don't worry. I know about that bloody thing. And I hate it's rotten guts, because that's the reason, why most of us during these hellish months feel so miserable.

[@cusa6180]

smokin hawt

[@ariesbaybie2255]

👍👍

[@sarikajagroop2967]

I want to no because I am in grade four

[@xternalpunk]

Using the more layers of clothing is such a bad example...

[@tpptap]

can i have the anchor contact no ??

[@PrincessMunkiee]

Can anyone understand what she is saying 😅

[@jimmyjonestodd2556]

Your shelf gives me anxiety

[@alykrause7857]

The whole video, I was like, “Lady, you are a very beautiful person but you need to brush the back of your hair.” Smh but no hate just my opinion but you do you

[@actuallyavailable]

Who else pauses to watch the text? 🤣

[@campbellzachc]

As a sapiosexual: "*SMASH*--Next!....c'mon, keep 'em comin'"

[@ashleymuniz8448]

what happend to crashcourse kids

[@kayshaphobic5394]

ashley muniz they ran away

[@GroWinn]

Too be honest I didn’t understand what she went with anything 😐

[@naijalatestnews]

you're too fast

[@uyenpribbenow9715]

:D

[@jibran_0_0]

*THIS WAS AN IMPORTANT TOPIC FOR ME LIVING IN A HOT PLACE, BUT ALL I CAN HEAR IS HER OVER EXAGERRATED BRITISH ACCENT* Losing quality in the content also

[@jenp3595]

go check out gaming with oakley it is the best channel

[@GoatzAreEpic]

You are extremely based. Gg ez

[@firehawk8521]

Selling piles of likes HMU