Case Design for Liquid Cooling

[Kaldskryke]

...
Qcpu = Tdelta * Fh2o / Rblock (since the input and output temp can be considered constant, the heat absorbed by the water in the block is going to be a function of the temp difference between the water and the CPU, the flow rate of the water, and resistance to heat transfer of the block)
...

I know I'm new here and all (note my postcount) but how do we know the heat flux is linearly proportional to flow rate?

AFAIK most correlations for heat transfer coefficients for tubes are something more like Nu = 0.023*Re^(0.8)*Pr^(1/3), such as the seider-tate correllation which certainly implies a non-linear relationship between local velocity and heat transfer

Furthermore, when you correctly assume halved volumetric flow through your parallel portions that doesn't mean the local fluid velocity within those portions will be halved, and it's the local fluid velocity that matters, right?

I'd love to be corrected on this because it certainly makes the math simpler

[Blauhung]

I know I'm new here and all (note my postcount) but how do we know the heat flux is linearly proportional to flow rate?

AFAIK most correlations for heat transfer coefficients for tubes are something more like Nu = 0.023*Re^(0.8)*Pr^(1/3), such as the seider-tate correllation which certainly implies a non-linear relationship between flow and heat transfer

you are right, but once you start getting into Nusselt and Reynolds #'s and stuff people tend to gloss over even more then what most probably did at my math there. You can assume its somewhat linear for the flows we are running at. If i pulled out my books you can show that reducing the flow rate by half kinda kills your heat transfer efficiency by about that much too provided you aren't doing anything weird by changing into a different flow regime within the block.

And lol, i have no clue how i came on and looked at this thread right as you were writing this. As for local fluid velocity, that more a function of the flow path of the block and pretty much all gets rolled into the efficiency correlations for the heat exchanger you are looking at.

[Kaldskryke]

you are right, but once you start getting into Nusselt and Reynolds #'s and stuff people tend to gloss over even more then what most probably did at my math there. You can assume its somewhat linear for the flows we are running at. If i pulled out my books you can show that reducing the flow rate by half kinda kills your heat transfer efficiency by about that much too provided you aren't doing anything weird by changing into a different flow regime within the block.

Thanks .

EDIT: wouldn't running blocks in parallel decrease the total loop restriction and thus increase total flowrate?

[Blauhung]

Thanks .

EDIT: wouldn't running blocks in parallel decrease the total loop restriction and thus increase total flowrate?

yup, but not by much, the overall loop resistance in serries would be
Ro = Rb1 + Rb2 + Rrad

and in Parrallel
Ro = 1/(1/Rb1 + 1/Rb2) + Rrad

The overall resistance to flow would be lower, so your flow through your radiator would be slightly higher, and yes the flow through the blocks would be slightly higher then half, and without going through the math you can't say for sure, but again its not going to be enough to have it work out to be better then serries

[Mick64]

Here's another render of the extended case. I've put some casters on it this time and changed the design of the HDD cage. I prefer the original cage myself, but I've had to simplify the design to aid manufacture and now it can hold five drives...

[AllAgainstPaul]

That case is looking more and more amazing. are those back-and-forth casters or swivel casters?

Have you thought about adding some type of handles on the top of the case for easy carrying? I don't know if handles would be a good idea though, because that might be to much weight on the metal that is around the handles.

I am jealous of your skill in SketchUp. You said earlier that you make many of your sketchup components. Do you upload them anywhere?

[Zebo]

You definitely got some mad design skills and good concepts!!!

My ideal case would only have one fan... an infamous Torin blower or maybe two - sucking air from case ported properly to cool HDD, across mobo etc, and exhausting into top rad compartment. Back a few years ago a single one held a magazine vertically on intake on rad box I built. Massive pressure with almost zero noise. Fans bite, the sooner we move to blower configs the better IMO.

As far as cost. I don't see how cooler master made the Wave Master For like $140. It was all aluminum, 4mm thick throughout and front bezel and parts was a massive 10mm thick! Maybe that's why this discontinued it. I have never seen a case of that quality since including those from LL and SS let alone for $140. I would approach Cooler Master.

[Blauhung]

Hey Mick, what would it look like with the evga board flipped? My desk is setup such that i end up with the left side of the case next to a wall and I would never see my handy work through the window.

[Brodholm]

Hey Mick, what would it look like with the evga board flipped? My desk is setup such that i end up with the left side of the case next to a wall and I would never see my handy work through the window.

The chassis are made so you can switch from inverted to normal. And the sides are also identical so you can switch that as you like.

[Acurax]

I would buy this. Hope you can get it manufactured!

[dejanh]

This would easily be $1,000 case if it ever gets made. It is absolutely nuts!

[Demo]

I love the case design, Im currently using aircooling but i might change to water cooling probably late this year or next year.. I still need a lot of research and ofcourse funding the project.

[gergregg]

Still holding out hoping this will get produced.

[Sullen]

That setup is absolutely sexy! What kind of board is that?

EVGA's Classified SR-2 For Intel Xeon 5500 and 5600 series processors...A board built for serious awesomeness!!!

And, am I the only one who thinks that bigger is better? I'm already frustrated because I already bought an 800D for my new build and now with the SR-2 right on the corner that will not fit in an Obsidian I really wish I could have gotten something like this instead, and don't get me wrong I love the Obsidian but this is the life of computing constantly changing and full of Murphy's Law all over I'll get one of this any day with hot swap bays for both HDD and SSD's, able to fit 4X140 Rads on top and at least a 3X140 on the bottom, and some discrete places to fit smaller rads like 1X140, 2X140, 1X120 etc. for more than two loops, the option the Obsidian have to change the CPU bracket without removing the MoBo from the case, more 5.25" bays for fan controllers, reservoirs, card readers, optical drives, you name it, like at least 10 spaces YES! I lost it, but in my world un-logical, crazy stuff is the everyday recipe... Awesome looking case my friend and beautiful render, can I get one like the one I just described?

[naokaji]

And, am I the only one who thinks that bigger is better?

It's not just the hw, where else can you fit a GTX 480 + GTX 360 with 38mm fans + gutted 25mm fans as shrouds in push pull? yeah there is the extended ascension, but to be honest outside the US its not exactly cheap due to shipping and customs and Micks case looks so much better.

[Jandar]

WOW, this is one mean looking case, but why in gods name did you put the connectors on the bottom. this is a case which will practically only stand on the floor, and by putting the connectors this close to the floor you will have the problem of people kicking your cables, or when not used, they gather a lot of dust.
I like the silverstone TJ-09/10 solution where they put the connectors in a flip-up on top of the case, so the connectors are protected when not in use, and accessible when needed without bending to the ground to put your cables in.

Hmm i need to read better, i see now the connector panel is modular and can be but in a top slot also, nice solution..

Wishfull thinking if this case would be a sub 300 $ case, i would love to buy one if so.

[JTF195]

I really like this case, especially with the addition of SR-2 support.

It's definitely the case I have my eye on for my next build, if I ever manage to start it.

[Nicksen]

Love it all.

[Raychem]

Mick...any update?

[Vinas]

I'd love to see some flat black, thickly squared handles at either side of the top of this case. That's really all it is missing for me, although we could mod add our own, this case is about being everything we want it to be fresh out of the box!

[Nicksen]

Handles? Not my cup of tee, but would like to see how it looks?

[montereywill]

I must admit I am one of the many that wants one of these cases. I have been looking around the net trying to find fabricators, and I came across this website. http://basics.mfg.com/how-it-works-for-buyers.html. This website allows you to submit your fabrication request to potential fabricators. It provides for NDA and intellectual property rights protections. You can even upload your cad files, etc. once the terms have been agreed upon. Just an idea to maybe help this thing get moving forward. I am willing and able to put up cash for a a single fabrication. Let me know if this would help in getting this project out the gate.

[Nicksen]

Cmon Mick. Bring us some updates? Hate waiting for something I really want

[Bolas]

WOW, this is one mean looking case, but why in gods name did you put the connectors on the bottom. this is a case which will practically only stand on the floor, and by putting the connectors this close to the floor you will have the problem of people kicking your cables, or when not used, they gather a lot of dust.

Not true. I would put this case on a pedestal on the back of my desk. The floor is toddler territory, not the place for a fancy computer.

[montereywill]

Mick. Have you thought of using Protocase. I have no idea about cost, but their homepage stats "No Minimum Order" and "Built in 2-3 Days". The specialize in custom electronic cases (computer cases, etc.). Would love to see this thing get built, as it would make me and a host of others extremely happy.