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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Product idea
Date: Tue, 18 Feb 2025 00:43:43 +0100
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On 2025-02-17 22:55, Don Y wrote:
> On 2/17/2025 1:23 PM, Carlos E.R. wrote:
>> My computer room stays one or two degrees above other rooms. A desktop 
>> computer, some peripherals, printer, switch, wifi AP, a minicomputer 
>> with display...
> 
> Houses, here, use forced air HVAC (for the most part).
> But, virtually all are built on slabs and are devoid of
> (distributed) return air ductwork ("Supply" is high;
> "Return" is omitted).
> 
> So, open room doors are the primary means of recovering
> air from those rooms.  CLOSE a door and you seriously
> impede air flow IN and OUT of said room.

Is that Canada? Because I have seen that in Ottawa. Originally for 
heating, later AC added.

> 
> OTOH, most floorplans are "open"; more than half of the
> floorspace CAN'T be "isolated" in such a way.
> 
> The point being that one can easily (deliberately or
> accidentally) "capture" waste heat in a room.  This
> is a win for places like bathrooms where you typically
> want to step OUT of a shower into a WARM(er) room
> and not the cold of an air-conditioned space!
> 
> Even without anything "on", there is a large quiescent
> load:
> - three switches (25W ea)
> - printer (sleeping)
> - print server (laserjet has no NIC)
> - 12 "idling" UPSs (with loads "off")
> - all the servers/workstations "off" (needing power for LoM)
> - all the devices (monitors, NASs) with "soft" power switches
> 
> I'd imagine there's at least 100W there, 24/7/365.
> 
> But, one doesn't see any real downside as there isn't
> a line-item on the electric bill that makes clear the
> cost of these inefficiencies.  And, the HVAC does a
> reasonably good job of insulating us from any associated
> PHYSICAL discomfort!

Heh, my electricity company does write in the invoice what they think 
I'm spending electricity on. Like so many Kwh for the fridge, the 
clothes washer, etc. It is ridiculous.

I had a gadget to actually measure the power consumed at a socket, but 
it broke. Like if its internal software got corrupted. I should get 
another one day, and find out what my computer socket takes.

-- 
Cheers, Carlos.