Hi Al
Chilled water is normally left to the building services engineers, and
is as common as anything. Any area with large buildings and cheap
off-rate electricity has them.
At 44/90, it is well within normal design limits as is 100psi. There
would be countless thousands of vessels, most in the basements of high
rises running at or around this duty.
I have no problem with the question, and can see nothing to get excited
about.
Al, if you see this as a highly technical exercise, then perhaps you would care to share some of you concerns. To me, this is near enough to straight out of the book: no FEM/CFD; just get on with it. The only thing I forgot to mention is care with insulation, as wicking/waterlogging can be a problem, and I prefer to use closed cell products to guard against this.
A chilled water tank/vessel is no big deal. They have been built for
over 100 years, hold a fairly benign liquid and do not have an eventful
history as far as I am aware.
However under -20C materials selection becomes more interesting but not
really difficult.
Oddly enough, yesterday I received an inquiry to upgrade a fish brine freezing plant that I spec'd out about 10 years ago. It is a little more interesting as the brine runs at minus18C, and is prevented from freezing by saturating with sea salt. Refrigeration is ammonia, and the brine tanks evaporators require careful design to control icing up. They now want to go to packaged quick freeze which probably means a second refrig stage and some calcium chloride brine tanks (-25; cant do with sea salt), although I may get away with plate freezers. The tanks will probably be mild steel; transition temperature permitting, as the other 12 tanks are mild steel (spec'd by me) and have worked just fine.
With reference to economic dimensions; my comments result from a detailed exercise that I carried out on HTHW thermal storage vessels many years back. I worked through the whole thing for completeness and traceability, but its just common sense really.
If you think its very difficult, then perhaps you have wandered into an area outside your personal expertise. That doesnât mean its difficult; it just means you havent had occasion to study it.
Cheers
Steve
-----Original Message-----
From: aluser2 [mailto:alwynk@shaw.ca]
Sent: Tuesday, March 22, 2005 9:27 AM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Chilled Water Storage Tank
i cant agree with steves comments on this one. They are incredably simplistic and misleading. There is far more involved than such posted questions could satisfy.
Given the banality of the questions eg please provide "a website giving him the knowledge to design a tank" the inquirer should not be performing this task.
I do not beleive this website should be used for such ill conceived purposes.
>
> Hi Rommel
>
> I did a number of these some years back. They were all mild steel
> (cheapest) and horizontal axis with torispherical ends. I used BS5500
> for the code although they was no code requirement. Cant remember the
> pressure but it would have been around 3-5 bar. The support saddles
> took an age to work out. If you need a "stratified" system to keep the
> chiller capacity down remember you cannot use the density difference
> of water to stratify the charge as water is at its minimum volume at
> about 40F. I used baffles and mesh diffuser plates; seemed to work
> although space limitations required multiple vessels to be used which
> helped stratification. For higher pressures, long skinny tanks are
> cheaper than short fat ones, but watch the supports as they get
> awfully complicated if you need more than two saddles.
>
> Cheers
>
> Steve
>
> -----Original Message-----
> From: rommel noderama [mailto:nrommelh@yahoo.com]
> Sent: Monday, March 21, 2005 11:46 PM
> To: PipingDesign@yahoogroups.com
> Subject: [PipingDesign] Chilled Water Storage Tank
>
>
>
> Team,
>
> I have a chilled water storage tank project, can anybody provide me a
> website that can provide me the knowlede on whats the best economical
> materials to be use, the procedure for fabrication upto finishing,
> tank design, etc. The storage tank capacity is 36,000 gallons, max.
> pressure is 100 psi, chilled water temperature to be maintain @ 44 F,
> maximum ambient temperature is 90 F, storage tank is fully insulated
> with SUS cladding.
>
> Thanks and best regards,
>
> Rommel
>
>
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