I appreciate your simplified explanation about heat exchangers and fluid mechanics. It's like summarizing the keypoints of chapters 5 and 6 of Perry's Chemical Engineers Handbook. Keep it up engineer. ;)
Instead of parallel flow and counterflow, I learned them as co-current flow and counter-current flow. (They might not have been hyphenated--it's been a while and I don't have my old textbooks handy to check!) This is a great refresher for me, although it brought back terrible memories of trying to calculate temperature changes across shell-and-tube heat exchangers... :-)
No, they really don't. Some probes have additional engines for maneuvering, but they are small and hot by design. They don't contribute at all to cooling.
no mention of coiling for increasing area. your car's radiator uses finned tubes, but not concentric (there is just the hot fluid tube and the fins) then air flows past the tubes to cool it down. your computer uses just the fins attached to a conductive plate to cool the CPU, a fan is attached to flow air past the fins.
I believe you can reduce most coiling to the shell-and-tube model, or simply a lengthened concentric design. In a car radiator, water heated by the engine enters the radiator at the top, flowing downward through a series of finned tubes. The shell is the engine compartment, through which air enters and exits. The computer can be treated as a modified concentric design. The case of the computer is the outer tube, air is the outer fluid, and the heat sink on the CPU can be modeled as a collapsed tube with fins. If you look at the system as a concentric set of tubes, but sliced lengthwise down the center of the tubes. This probably over-complicates the analysis, though. Many times in engineering analysis, if you can look at it just right, you can match your case to a simple model case.
and if the computer doesn't HAVE a case? is the whole room then the shell, if it's not in a room is the whole earth the shell? at which point is it ridiculous to consider the shell. what about the radial fins on a tank? same thing...no shell unless the whole earth is considered the shell.
The video convolutes velocity and mass flow. It is not harder to transfer heat to a fluid moving very fast. Q=mcdT references mass flow - not velocity. The amount of energy required is dependent on the amount of matter, i.e. material, not on how fast it is moving. It is actually easier to transfer heat to a fast moving fluid since the flow is more turbulent. The video even points this fact out when discussing baffles in shell and tube heat exchangers. The concentric tube example is correct, but the explanation is not. Speeding up the flow of the inner tube actually increases the heat transfer since the heat transfer coefficient increases with velocity. The temperature of the cold inner fluid does drop as the flow is increased. However, this temperature drop is because the increase in mass flow is proportionally greater than that of the heat transfer coefficient - not because the fluid sped up. Again, Q=mcdT. Since m increases more than Q, and since the heat capacity, c, is roughly constant, dT must decrease. This explanation also accounts for why the hot, outer fluid temperature actually decreases even though the outer fluid flow and the amount of area stayed the same. If the overall heat transfer had decreased, the outer fluid temperature would still have been hot (i.e. red).
well, indeed the explanation in the video is not bullet-prove. What in ment is 1) M=dot{m} at 3:42 and 2) that by Q=dot{m} *cp*dT you can measure the heat transfer through a HX. The formula describes the consequence of a HX by measuring quantities at the inlet and outlet of the HX, it does not describe its operation as dT strongly depends on dot{m} of both fluids...
I took it to mean that the faster moving fluid would be spending less time in the heat exchanger, since they were working with a simple fixed-size concentric tube design. It also left as an exercise for the viewer the reason you might or might not want counterflow in that device.
That is how I interpreted it as well, which is why I take issue with the explanation. It is not useful to think about residence time in this context. The heat transfer rate does not decrease as residence time decreases/velocity increases. Heat transfer actually increases because velocity improves the heat transfer coefficient. The video example is correct to point out that the temperature change is less, but that is because the mass rate has increased - not because heat transfer has decreased.
there is an experimental radiator design called liquid droplet radiator. Where at one end it atomize the heat transfer fluid into very minuscule droplets with extremely high surface to volume ratio in order to maximize heat transfer. Then a collector at the other end recycle the droplets.
*I feel like the series has been a little more practical lately instead of being just Engineering Physics. That's good.* *Engineering is still a very broad topic, though. Sort of like taking Crash Course Literature, Crash Course Film, and Crash Course Theater and then condensing them into a single series called "Crash Course: The Arts." Or at least part of a series. There would still need to be room for Music and non-performance visual arts.*
I install and maintain heat exchangers at office and university buildings. All this she said is true. We keep your offices nice and warm all winter. We hide in the mechanical rooms and watch TH-cam vids on our phones.
X-Ray *machines* make a lot of heat I'm being a stickler I know, but yes, our lab source x-ray devices have liquid cooling for the target they use for x-ray generation :D
You will get condensation all over your fridge contents. You'll raise the temperature inside the fridge for a significant period of time because water has a lot of thermal mass. Your soggy, warm food will spoil faster. Your compressor will be needlessly burdened until all the heat has been transported out the back radiator. It is designed to operate many times a day for relatively short periods of time. Running it continuously for long periods of time creates additional wear and tear.
You can work and research heat exchange systems following the career of Mechanical or Chemical Engineering (the first sizes and constructs, the second only sizes).
But in all of those heat exchanges the cold fluid warms up. So if you need tot get that cold by an other heat exchange than u keep going. So how do you keep the cold fluid cold?
So a steam locomotive uses a shell and tube style heat exchanger (boiler) if I understand this but with hot combustion gas in the tube and cold water in the shell. Am I right?
Nearly all locomotives use that design, the "fire-tube boiler". Alternatively, the "water-tube boiler" contains the fire within the shell, and runs water through tubes over the fire. See Wikipedia for good articles on both, under those names.
*_...why don't laundromats have multi-plate heat exchangers on their dryers and washers- there's even a sense of all-climate operation to it: independent of ambient temperature... (also, ultimately you'd want to discuss air-flow-pressure heat-transfer-rate, 'efficiency')... ((also, please, discuss 'heat pumps' and their, efficiencies and advantages))..._*
Hmm introducing the simplified Formula in 5:01 and then saying finned tubes increase the heat transmitting surface is at best missleading. Due to this and other issues i am sorry but i have to say that the script of the show was a little sloppy...
It's basically about understanding psychology, becoming an alpha male, and learning to get the woman of your dreams. Please check it out if you get a chance :)
When I studied electrical engineering, Thermodynamics was a 5 credit class (1 hour 5 days a week) at a Junior class level. I would guess my mechanical engineering counterparts had additional classes at the senior level.
I like the idea and host is awesome, but i am struggling to understand and follow the concept. The explanations are a bit too complicated, perhaps make them even more simple. Also there is a bit too much information being thrown at me,i would appericate if there is a small pause here and there or slow down a little. overall i watched it 3 times to get the idea. please continue with this series i would like to know more.
Hey Aaiz! While these videos are packed with great information and can be super informative, they are designed to be a crash course, as the name implies. Unfortunately, our brains are not wired to receive information at the speed these videos are presented, so we still have to read books, talk with patient engineers and educators, and practice coursework in order to learn information to a point of understanding. Learning is hard work! It is a process that takes time, effort, and discipline. I encourage you to keep at it since we need more brilliant engineers like you!
Don't be discouraged; it appears that this engineering series in particular is meant to be an information-dense series. There is nothing wrong with going back and rewatching, or pausing the episode to think about the concepts introduced.
I think Dr. Somara looks even more attractive in this video than she usually already does. It's to the point where even her accidental flatulence would only augment her warm glowing aura.
"Increase the value of 'U'" - that's a lesson for life.
I appreciate your simplified explanation about heat exchangers and fluid mechanics. It's like summarizing the keypoints of chapters 5 and 6 of Perry's Chemical Engineers Handbook. Keep it up engineer. ;)
Very interesting channel. Love the host of this engineering series. She certainly knows her stuff & is excellent at explaining it.
Pizza based education helps me learn more better
From the Grave To the Flame Ministry you can if you set it on fire :D
Who is a non student just watching for the fun of it?
I think most of the viewers actually aren't engineering students.
Psychology major here
Retired programmer.
Me
..physicist ... likes to get anoyed about unprecise explanations and then writing mean comments ...
When I was at MIT, we called the business major Money Engineering. I don't think they liked that.
calling them engineer is a compliment
Wait you were at MIT (faints) *
Instead of parallel flow and counterflow, I learned them as co-current flow and counter-current flow. (They might not have been hyphenated--it's been a while and I don't have my old textbooks handy to check!) This is a great refresher for me, although it brought back terrible memories of trying to calculate temperature changes across shell-and-tube heat exchangers... :-)
Man, engineering is rad.
Building lightweight yet efficient heat exchangers for spacecrafts must be very challenging
Challanging, go for throttle up.
Especially because spacecraft have to be cooled by radiation, rather using convection like in these heat exchangers.
Do they really have to though? Surely there is some waste ejected from the craft already, right?
No, they really don't. Some probes have additional engines for maneuvering, but they are small and hot by design. They don't contribute at all to cooling.
Yes, all our spacecraft, pretty much, need to use radiative cooling to avoid cooking the contents.
this is a whole thick chapter of my heat transfer module in 10 mins
glad that i found this before my exam
no mention of coiling for increasing area. your car's radiator uses finned tubes, but not concentric (there is just the hot fluid tube and the fins) then air flows past the tubes to cool it down.
your computer uses just the fins attached to a conductive plate to cool the CPU, a fan is attached to flow air past the fins.
I believe you can reduce most coiling to the shell-and-tube model, or simply a lengthened concentric design.
In a car radiator, water heated by the engine enters the radiator at the top, flowing downward through a series of finned tubes. The shell is the engine compartment, through which air enters and exits.
The computer can be treated as a modified concentric design. The case of the computer is the outer tube, air is the outer fluid, and the heat sink on the CPU can be modeled as a collapsed tube with fins. If you look at the system as a concentric set of tubes, but sliced lengthwise down the center of the tubes. This probably over-complicates the analysis, though.
Many times in engineering analysis, if you can look at it just right, you can match your case to a simple model case.
and if the computer doesn't HAVE a case? is the whole room then the shell, if it's not in a room is the whole earth the shell? at which point is it ridiculous to consider the shell. what about the radial fins on a tank? same thing...no shell unless the whole earth is considered the shell.
Great presenter, good delivery.
Plate heat exchangers are really hard to visualize. But so cool how much heat they can transfer in such small volumes!
As someone who is thinking about majoring in this, I want a crash course through law
The video convolutes velocity and mass flow. It is not harder to transfer heat to a fluid moving very fast. Q=mcdT references mass flow - not velocity. The amount of energy required is dependent on the amount of matter, i.e. material, not on how fast it is moving. It is actually easier to transfer heat to a fast moving fluid since the flow is more turbulent. The video even points this fact out when discussing baffles in shell and tube heat exchangers.
The concentric tube example is correct, but the explanation is not. Speeding up the flow of the inner tube actually increases the heat transfer since the heat transfer coefficient increases with velocity. The temperature of the cold inner fluid does drop as the flow is increased. However, this temperature drop is because the increase in mass flow is proportionally greater than that of the heat transfer coefficient - not because the fluid sped up. Again, Q=mcdT. Since m increases more than Q, and since the heat capacity, c, is roughly constant, dT must decrease.
This explanation also accounts for why the hot, outer fluid temperature actually decreases even though the outer fluid flow and the amount of area stayed the same. If the overall heat transfer had decreased, the outer fluid temperature would still have been hot (i.e. red).
well, indeed the explanation in the video is not bullet-prove. What in ment is
1) M=dot{m} at 3:42 and
2) that by Q=dot{m} *cp*dT you can measure the heat transfer through a HX. The formula describes the consequence of a HX by measuring quantities at the inlet and outlet of the HX, it does not describe its operation as dT strongly depends on dot{m} of both fluids...
Yeah they usually do a great job on the videos but that Mass flow rate concept is completely off.
I took it to mean that the faster moving fluid would be spending less time in the heat exchanger, since they were working with a simple fixed-size concentric tube design.
It also left as an exercise for the viewer the reason you might or might not want counterflow in that device.
That is how I interpreted it as well, which is why I take issue with the explanation. It is not useful to think about residence time in this context. The heat transfer rate does not decrease as residence time decreases/velocity increases. Heat transfer actually increases because velocity improves the heat transfer coefficient. The video example is correct to point out that the temperature change is less, but that is because the mass rate has increased - not because heat transfer has decreased.
there is an experimental radiator design called liquid droplet radiator. Where at one end it atomize the heat transfer fluid into very minuscule droplets with extremely high surface to volume ratio in order to maximize heat transfer. Then a collector at the other end recycle the droplets.
This Chanel is interesting
You can increase the value of the area by putting in some nice lighting, or maybe a rug that really ties the room together.
More heat lessons! Hoo-ray! Taking physics and learning more about calorimetry
*I feel like the series has been a little more practical lately instead of being just Engineering Physics. That's good.*
*Engineering is still a very broad topic, though. Sort of like taking Crash Course Literature, Crash Course Film, and Crash Course Theater and then condensing them into a single series called "Crash Course: The Arts." Or at least part of a series. There would still need to be room for Music and non-performance visual arts.*
Parallel flow is also called co-current flow
I install and maintain heat exchangers at office and university buildings. All this she said is true. We keep your offices nice and warm all winter. We hide in the mechanical rooms and watch TH-cam vids on our phones.
The best way to re-heat a pizza is by using a frying pan. For initial preparing obviously an oven is best. Using a microwave gets you a saggy pizza
Love your shirt!
Do architecture, if that's possible
Great video
Yeaaah New episode
X-Ray *machines* make a lot of heat
I'm being a stickler I know, but yes, our lab source x-ray devices have liquid cooling for the target they use for x-ray generation :D
(And I work with heat exchange tubes that use a helical fin :) )
What type of heat exchanger is a liquid-cooled computer?
It's with tubes probably so..
@@jjc5475 but does it have any of the fins or rings that she talked about?
For crissakes, don't put a hot tea in your refrigerator.
I'm glad I'm not the only one who feels that way.
You will get condensation all over your fridge contents. You'll raise the temperature inside the fridge for a significant period of time because water has a lot of thermal mass. Your soggy, warm food will spoil faster. Your compressor will be needlessly burdened until all the heat has been transported out the back radiator. It is designed to operate many times a day for relatively short periods of time. Running it continuously for long periods of time creates additional wear and tear.
Hey. This is my first crash course engineering, but her eyebrows are the most amazing thing in this video. Brb, watching the rest.
The first and last type of exchangers are literally the same thing. The shell in tube thing is just lots of inner tubes and one big outside tube.
You can work and research heat exchange systems following the career of Mechanical or Chemical Engineering (the first sizes and constructs, the second only sizes).
But in all of those heat exchanges the cold fluid warms up. So if you need tot get that cold by an other heat exchange than u keep going. So how do you keep the cold fluid cold?
Y'all need more electrical (best engineering) videos.
Can you add some excretory function of cdrcolatory system?
So a steam locomotive uses a shell and tube style heat exchanger (boiler) if I understand this but with hot combustion gas in the tube and cold water in the shell. Am I right?
I think it's the other way around, the water is in the tubes and the hot combustion gas is in the shell.
Nearly all locomotives use that design, the "fire-tube boiler". Alternatively, the "water-tube boiler" contains the fire within the shell, and runs water through tubes over the fire. See Wikipedia for good articles on both, under those names.
She's so awesome 🤗!
*_...why don't laundromats have multi-plate heat exchangers on their dryers and washers- there's even a sense of all-climate operation to it: independent of ambient temperature... (also, ultimately you'd want to discuss air-flow-pressure heat-transfer-rate, 'efficiency')... ((also, please, discuss 'heat pumps' and their, efficiencies and advantages))..._*
Can you please make crash course marketing
Hmm introducing the simplified Formula in 5:01 and then saying finned tubes increase the heat transmitting surface is at best missleading.
Due to this and other issues i am sorry but i have to say that the script of the show was a little sloppy...
I didn't realize that setting a Pizza on fire was a problem nowadays T_T
It's basically about understanding psychology, becoming an alpha male, and learning to get the woman of your dreams. Please check it out if you get a chance :)
sounds like a channel for "pick up artists" fascinated by jordan petersons "deep" thoughts...
Do engineers usually have this many lessons on thermodynamics
When I studied electrical engineering, Thermodynamics was a 5 credit class (1 hour 5 days a week) at a Junior class level.
I would guess my mechanical engineering counterparts had additional classes at the senior level.
Only thing i learnt from this is there are people stupid enough to set pizza on fire and a firehose is best to cool drinks down
My fav.
I like the idea and host is awesome, but i am struggling to understand and follow the concept. The explanations are a bit too complicated, perhaps make them even more simple. Also there is a bit too much information being thrown at me,i would appericate if there is a small pause here and there or slow down a little. overall i watched it 3 times to get the idea. please continue with this series i would like to know more.
Hey Aaiz! While these videos are packed with great information and can be super informative, they are designed to be a crash course, as the name implies. Unfortunately, our brains are not wired to receive information at the speed these videos are presented, so we still have to read books, talk with patient engineers and educators, and practice coursework in order to learn information to a point of understanding. Learning is hard work! It is a process that takes time, effort, and discipline. I encourage you to keep at it since we need more brilliant engineers like you!
You could change the payback speed and slow it down.
Also, engineering is pretty complex stuff.
Don't be discouraged; it appears that this engineering series in particular is meant to be an information-dense series. There is nothing wrong with going back and rewatching, or pausing the episode to think about the concepts introduced.
@@FalbertForester Yep and you probably shouldn't except to understand everything in a 10 minute video. :)
I know that this isn't related to the Course Engineering (but with the thumbnail), that may be in the future Crash Course on Fairy Tale?
I wish I could quote you in my personal statement 😭💔
Thank u
very interesting. like 722
We meet again! :D
where's hank and john
Crash Course wants to do many different courses, so they bring in people that have those other course as a specialty.
Ma'am ❤️
♥️
Faltan subtítulos en español , please!!!!
Anybody know the host’s name?
why cant I ever meet a girl like her? really smart and really beautiful
I think Dr. Somara looks even more attractive in this video than she usually already does. It's to the point where even her accidental flatulence would only augment her warm glowing aura.
*I didn't see a single Pizza.*
Step 1: Set a timer
Step 2:....Don't be an idiot?
Came for Pizza recipes
But idun wanna set my 🍕 on 🔥...
A more appropriate name/ title would likely improve the number of viewers. This is not at all about pizza!
Hi
Hiiii 2 commenting here
Eloooo 😛
I'm in love with this woman. I wanna exchange heat with her.
Hi 1comment
she's beautiful
I do not like this host....not personal but the accent annoys me
How generous you are to share your opinion.
you're actually annoyed by a British accent? how your world must suck...
@@bemusedalligator in this role...yes I prefer my English without accent
@@abodabalo i'm a giver
Lol English without an accent is relative. There is no standard English pronunciation. How funny.