× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



Chevette? That would cool a POWER7 :-) It's from a Ford Expedition!

- L

On 3/9/2011 1:23 PM, Jim Oberholtzer wrote:
We do indeed water cool the system, sort of.....

If your at the COMMON Annual Conference come by the session we are doing
on cloud computing and we will show pictures of it. That said, Larry
got a new car radiator from one of the vendors nearby (he is in Grand
Rapids MI after all), I think from a Chevette. The air is channeled up
through that radiator that absorbs the heat, warming the water which is
dumped into the preheat tank for the water heater. The resulting cold
air is then blown down onto the floor in front of the machine. Most of
the cooling for the entire system is done that way, all 20 LPARs worth.....

Jim Oberholtzer
CEO/Chief Technical Architect
Agile Technology Architects, LLC


On 3/9/2011 11:54 AM, DeLong, Eric wrote:
So you have water cooling on Frankie? How did you manage that?

-Eric DeLong


-----Original Message-----
From:midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Wednesday, March 09, 2011 8:04 AM
To: Midrange Systems Technical Discussion
Subject: Re: Cost Justifications

OK I wrote a certification question on the ratio between input power and

output heat and got booed off the stage. SO I will simply tell you the
answer. For each KW of input power (1000 Watts) you will get 3413 BTU of

heat output. Now since a teeny tiny little bit of that 1000 watts went
into creating LED light (a VERY teeny bit) and some into noise generated

by the fans you might get a measly 3410 BTU of heat. Point is that it's

a straight line relationship between input power and output heat. It's
fairly common for HVAC guys who know there stuff to ask what the total
power input to the data center is, what the percentage load on the UPS
is, and use that number as a basis for calculating cooling requirements.

If you put 100KVA IN you will need to get 341,300 BTU out somehow.

Now how much electricity it takes to remove those BTUs can vary A LOT.
In very cold climates, outdoor air can be drawn through filters to cool
the place (devices called 'economizers') and that's cheap. In hot
climates very large amounts of A/C are used to cool such rooms and that
cost can rival the power of the systems being cooled. In the FrankenLab

from about October through March 100% of the heat generated is turned
into domestic hot water and then heat for the house. In the summer it
ends up in the swimming pool or down a dry well. Very economical indeed.

- Larry 'DrFranken' Bolhuis

On 3/8/2011 6:09 PM, Evan Harris wrote:
What's the heat differential ? And the power requirement for the
cooling equipment to handle it ?:)

As you've pointed out the OP should also consider the maintenance and
license costs if any of keeping an existing machine versus upgrading
as this is often a simpler sell to management as it's a direct cost.

On Wed, Mar 9, 2011 at 9:45 AM, DrFranken<midrange@xxxxxxxxxxxx>
wrote:
Well the 720 and the 250 are about a wash in 'spec power' at 750 amd
782
watts respectively. That said, what you GET for those watts is a
little
different. The biggest 250 was 75 (Seventy five!) CPW (20
interactive)
while the teeeeeeniest 720 is nearly 6,000 CPW (one core) and as much
as
46,300 with all eight cores going. So a one core 720 is equal to
Eighty
250s in CPU capability. IN practice I would expect the 720 to draw
far
less than that and I measured a 2-core system with 6 drives closer to
100 Watts with IBM i 7.1 simply idling. (No user work at the time.)

The 720 also comes with a 3 year warranty so you drop maintenance
cost.
I also did a comparison of a POWER5 550 to a POWER7 750 and the ratio
there is 100 to 1 on power per CPW. That is the 750 generates 100
times
more CPW per input Watt than a 550! That's a lot of savings!

- Larry


As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow-Ups:
Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.