Date: Thu, 22 Jun 2000 11:44:01 +0200 (EET) From: Narvi <narvi@haldjas.folklore.ee> To: Olaf Hoyer <ohoyer@fbwi.fh-wilhelmshaven.de> Cc: Brian Handy <handy@isass0.solar.isas.ac.jp>, freebsd-hardware@FreeBSD.ORG Subject: Re: Hardware in space? Message-ID: <Pine.BSF.3.96.1000622113850.2206U-100000@haldjas.folklore.ee> In-Reply-To: <4.1.20000622075529.00979b80@mail.rz.fh-wilhelmshaven.de>
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On Thu, 22 Jun 2000, Olaf Hoyer wrote: > Hi! > > Well, the question is: > Which parts _do_ need cooling? All that generate more heat than can be radiated away? > Most parts of a notebook are designed to run quite cool, also due to lower > power consumption. Yes - but there is air present that takes heat away. In space there isn't. > Also a Flash disk also runs quite cool, no need for extra cooling. > The only source of heat I can imagine would be the CPU. > (At least of the computer used therefore) > > So using some low-power version like a 486 or an IDT C6/Winchip will help > decreasing emitted heat. > > I ran a Winchip C6 (old one) at 50x2 = 100 MHz in a desktop system without > even a heatsink (yes, bare CPU, no heatsink or fan) for some weeks under > load, no probs. > The Winchip only consumes half of the power than a similar (MHz) Intel > Pentium MMX or AMD K6. > (At 200 MHz, the IDT eats 10 Watts, Intel/AMD ~20 Watts) > 10 watts is still a lot. > In my experience, if the system is intended to run only for some minutes, > the CPU even at full pace hasn't enough time to overheat. > Even if you need cooling, there's another idea. > But if it is absolutely neccessary that it worked and made no errors, this no longer holds. > Basically, you need to transport the heat=energy away from the chip. > On earth, you may take air as transport and dissolver. > But why no liquid cooling? Crazy! Liquid weights a lot - and besides, how do you cool the liquid? > Simply fix some small tank (about some fluid ounces/millilitres) on top of > the CPU, and fill it with water or alcohol. It shall absorb some of the > energy emitted by the CPU due to contact. > No big need for circulating it to the outer parts of the rocket, as it is > only for some limited time. > Basically you can calculate the energy needing to be absorbed... > Modern CPUs have some known power consumption, so you can calculate the > absorbed energy.. > > Regards > Olaf Hoyer > > > -------- > Olaf Hoyer www.nightfire.de mailto:Olaf.Hoyer@nightfire.de > FreeBSD- Turning PC's into workstations ICQ:22838075 > > Liebe und Hass sind nicht blind, aber geblendet vom Feuer, > dass sie selber mit sich tragen. (Nietzsche) > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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