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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies

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Default Efficiency: hidden factors

New power supplies are more efficient, so saving money.

But I wonder in a server room about the hidden costs of air cooling; perhaps a power supply that can run at elevated temperature (and so avoid cooling costs) might actually end up being more efficient if cooling requirements are reduced.

I recap supplies so that they can endure the Summer heat and I can save on cooling.

Does anyone know how many Joules it takes to remove one Joule of heat? The maximum thermodynamic coefficient of performance is Tc/(Th-Tc), i.e. a fraction of a joule to remove a joule in the ideal case.
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A power supplies is normally not the problem with a high ambient temperature, CPU, harddisk, SSD and graphics cards is something you should be more worried about then.
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My hard drives and CPU run close to room temperature; graphics cards are probably the real issue, but a server normally has little use for a graphics card.

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Quote:
Originally Posted by ashiekh View Post
Does anyone know how many Joules it takes to remove one Joule of heat? The maximum thermodynamic coefficient of performance is Tc/(Th-Tc), i.e. a fraction of a joule to remove a joule in the ideal case.
That has so many different variables and is much easier to evaluate in a specific case study. However, AC units usually work in the efficiency range of 200-400%, so maybe that answers your question?
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Originally Posted by Rasmus0909 View Post
That has so many different variables and is much easier to evaluate in a specific case study. However, AC units usually work in the efficiency range of 200-400%, so maybe that answers your question?
Yep, that answers it. So the cost of air-conditioning is only a fraction (1/4 to 1/2) extra over the cost of powering the equipment; even so, it might make for a worthy saving if one could do without.

In my case not cooling the house for the computers is a massive saving.

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people who run data centers do look into these issues rather extensively.There are many articles and open source resources that describe the approaches taken by google, amazon, Microsoft, et. al. to minimize energy use in data centers.

The removal of heat is a major design criteria.

From a distant and long time view, the trend has been away from super chilled differential air temp. cooling to running at higher ambient, but high volume dissipation. (server rooms used to be air conditioned at 60-70 F...now people who work complain of heat exposure issues)

So, just to confirm:

Cooling is not a "hidden cost" in server rooms. It is exhaustively studied.

Higher continuous temps are definitely the norm.
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I don't think there is anything I have said here that is not already know; just thought it might be an interesting (and relevant) topic. I was thinking of crypto-mining where people are relearning what is already known; in my case how high quality capacitors will save me money by allowing me to run hot.

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https://www.intel.com/content/www/us...ion-brief.html

high ambient temperature operation for efficiency.


OK, of course article today about Russians trying to use supercomputer(from top secret nuclear research facility) to mine ....just insanity.

http://www.bbc.com/news/world-europe-43003740

Too much time, energy and focus on the bubble in my humble opinion.
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This is great news (the warmer temperatures not the misused super-computer); it bugged me walking into an ice cold server room, knowing how much energy was being squandered.

Still trying to figure out if the crypto of crypto-mining can be done without such a massive use of electricity.

Last edited by ashiekh; 1 Week Ago at 05:13 PM.
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Quote:
Originally Posted by mdk777 View Post
"Datacenters are estimated to consume 1.5% of total world power and rising rapidly"

That is scary

They go further than I would have expected and suggest the possibility of 40 or 50C operating temperature; at that point the savings in Winter increase as one can use that sort of heat to warm the rest of the building.

Last edited by ashiekh; 1 Week Ago at 07:15 PM.
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