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Re: Re: Equipment in loft - dust and heat issues?

I'm pretty sur, within bounds, it's temperature cycling , the ups &
downs, that are the killer - 'bit like repeatedly bending a paper-clip!


Andy Whitfield wrote:

> --- In ukha_d@xxxxxxx, "Bill Kearney"
> wrote:
> >
> > > I don't think you'll have a problem as long as the fans run
> the
> > > time and  you've got a good air flow within the equipment.
> > > Maybe use extra fans or fans with a greater air flow?
> >
> > Attic spaces are a lot hotter than you might think.  I suppose it
> would
> > depend on a number of factors like airflow and roofing material.
> If the
> > ambient temperature INSIDE the attic isn't at least below 85F
> you're asking
> > for a much shorter lifespan on the devices.
> I appreciate the loft will get hot but electronic equipment can run
> at high-ish ambient temperatures.
> It does not follow the life span of electronic components will be
> shortened because of a modest rise in ambient temperature (up to
> about 40C).
> Take the example of a power transistor mounted on a heatsink.  With
> an ambient temp of 20C, the transistor may run at 50C.  If the
> ambient temp increases to 30C a fan cuts in and the transistor still
> runs at 50C.  If the ambient temp increases to 40C then the fan
> speeds up to increase air flow and the transistor still runs at
> about 50C.  In other words the transistor runs at the same temp
> regardless whether the ambient temp is 20C, 30C or 40C and it's
> lifespan is not effected.
> Of course the above example does rely on good design and the ambient
> temp not going above 40C.
> The bottom line here is to look at the manufacturer's specifications
> for ambient temperatures.  Ambient temps of 10C to 40C seem common.
> But this relates to electronic components.  It is different for
> batteries.  Their life span will be shortened by the heat.
> And I would guess electromechanical items will have a different
> ambient temp range.
> > Even when it's 80F outside I've seen it be 115F in my attic.
> > That big, black roof just bakes in the sun.
> >
> > No amount of fans will help if you're only pushing around hot
> The 'amount of cooling' is a combination of ambient temp and airflow
> from the fans; within certain temp limits.
> Best thing is to look at the manufacturer's specifications for each
> item such as servers, HDDs, etc.
> Regards
> Andy

[Non-text portions of this message have been removed]

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