Does anyone use their computers under 100% stress in a 90F degrees environment?

[Rod Speed]

(e-mail address removed) writes

You live in an area where it gets to 90° F and
your parents need persuasion to install A/C?

Presumably they dont spend as much time in the bedrooms
awake as he does and they spend most of their time
downstairs where the main A/C does have a reasonable effect.

It wasnt that unusual for A/C installed in those days
in europe to not attempt to A/C the entire house.

 

[Mxsmanic]

Got any brand names and model numbers? I assume those are available in U.S.

Carrier is a well-known name and should be available in the U.S.
There are many other brands. Mine is a Carrier, although it was built
in Italy. Airwell comes to mind. I don't know if Rheem is still in
business.

 

[Mxsmanic]

Hmm, I didn't know fans raise temperatures like that. Is that only when when the
temperature is really high? Or does that happen like in 80 degrees(F) area?

It _always_ happens. It's physics. The moving vanes of the fan and
the motor add heat to the air as it passes through the fan. The
increase is slow but continuous. The temperature _never_ drops when a
fan is running; it never even stays the same. It always rises.

Additionally, the only reason a fan feels cool is that it accelerates
evaporation of your sweat. Unfortunately, this evaporating water also
adds to the humidity in the room, making it necessary to sweat more
and more just to keep cool. Eventually it stops working all together.

Above 85° F or so, fans are often a waste of time, as they just can't
help sweating enough to make much of a difference. It depends on the
relative humidity, though.

 

[Mxsmanic]

Its just basic physics, the power that is used by the fan motor
has to end up in the air temp, there is nowhere else for it to go.

The movement of the fan also heats the air.

One important thing to remember is that fans never lower the air
temperature. This is critical for PCs. It means that if the air
temperature is 90° F, no fan, no matter how powerful, will be able to
get the PC below 90° F.

 

[Ed Light]

A fan gives wind chill.


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[Rich]

Electrcity used by AC is expensive in this area. Even when AC is on, it doesn't
seem to do well due to its central unit and old age (20-30 years?) Also I don't
own this house (parents').

When was the last time that antique had a pressure test? Can you even
recharge it
with the newer gasses?

 

[Rod Speed]

Rod Speed writes

The movement of the fan also heats the air.

That movement can only come from the power that goes into the motor.

One important thing to remember is that
fans never lower the air temperature.
Yes.

This is critical for PCs.

Nope, just a minor consideration because PC fans use
little electrical power compared with the rest of the system.

It means that if the air temperature is 90° F, no fan, no
matter how powerful, will be able to get the PC below 90° F.

Yes, but thats a separate issue to your claim about humidity
and 'can rapidly create a vicious circle of heating'. Doesnt happen.

 

[Rod Speed]

(e-mail address removed) writes

It _always_ happens. It's physics. The moving vanes of the fan
and the motor add heat to the air as it passes through the fan. The
increase is slow but continuous. The temperature _never_ drops
when a fan is running; it never even stays the same. It always rises.

Nope, depends on the rate as which the air in
the room is moved out of that room by the fan.

Additionally, the only reason a fan feels cool is that it accelerates
evaporation of your sweat. Unfortunately, this evaporating water also
adds to the humidity in the room, making it necessary to sweat more
and more just to keep cool. Eventually it stops working all together.

No it doesnt. The sweat evaporating from a person
never increase the humidity in the room much.

Above 85° F or so, fans are often a waste of time, as they just
can't help sweating enough to make much of a difference.

Oh bullshit. Most obviously when the relative humidity is only 5%

It depends on the relative humidity, though.

Yep, your claim is just plain wrong with low RH.

 

[Mxsmanic]

A fan gives wind chill.

Not at 90° F.

 

[Mxsmanic]

Nope, depends on the rate as which the air in
the room is moved out of that room by the fan.

Most fans aren't used to move air in or out, they only circulate it
within the room. And so the temperature always rises.

No it doesnt. The sweat evaporating from a person
never increase the humidity in the room much.

On the contrary, a person in hot air can lose a litre an hour through
perspiration, and in a normal room that raises humidity considerably,
just like a humidifier. It doesn't take long before the humidity is
so high that a fan barely makes any difference.

 

[Mxsmanic]

That movement can only come from the power that goes into the motor.

Yes, so?

Nope, just a minor consideration because PC fans use
little electrical power compared with the rest of the system.

It's a big consideration because most people don't realize that a fan
cannot lower the temperature of the PC below the temperature of the
ambient air. To get the temperature down to 20° C within any part of
the PC, you _must_ have a source of air that is colder than 20° C, no
matter what types of fans you use.

 

[Guest]

Are you able to keep the computers stable and not breaking (e.g., a SeaSonic
PSU overheated) in a room that is about 90 degrees(F) during heat waves
with no air conditions?

I have seen my computer's Athlon 64 3200+ (754) CPU go over 160F degrees
and ASUS K8V SE Deluxe motherboard go over 120F degrees.

90F is only mild heat, and any computer should run fine in it unless
its cooling setup if terrible. A large fan at the lower front and a
fair-size opening at the upper rear should be enough supplemental
cooling. The hard drives can be screwed to the bottom of the case, on
edge, about 1" apart, and benefit from that fan air. Leave the slot
next to the video card empty, and leave its rear cover off as well.
Add a blow hole over the CPU fan only as a last resort, and don't
restrict air flow through it with flex duct (rigid tube is OK).

 

[Rod Speed]

Rod Speed writes

Yes, so?

So there is no 'also'

It's a big consideration because most people don't
realize that a fan cannot lower the temperature of
the PC below the temperature of the ambient air.

Thats not the reason for the fans, they just move the
heated air thats inside the case outside the case.

No one is even attempting to get the temperature
of the PC below the temperature of the ambient air.

To get the temperature down to 20° C within any part of the PC,

He isnt even attempting to do that.

you _must_ have a source of air that is colder than
20° C, no matter what types of fans you use.

Pity he isnt even attempting to do that.

ALL he needs to go do use his system in a 90F environment
is to get a decent airflow thru the case so the extra heat that
is generated inside the case doesnt raise the temp too much.

 

[Rod Speed]

Rod Speed writes

Most fans aren't used to move air in or out, they only circulate
it within the room. And so the temperature always rises.

Clealry it doesnt when the fan produces
some air movement out of that room.

And if you dont like the minor temperature rise
caused by the fan, the obvious thing to do is to
deliberately move some of that air out of that room.

On the contrary, a person in hot air can
lose a litre an hour through perspiration,

Not when just sitting at the PC they dont.

and in a normal room that raises humidity considerably,

No it doesnt. That effect is barely measurable
in fact when the individual is sitting at the PC.

just like a humidifier.

Nothing like in fact.

It doesn't take long before the humidity is so
high that a fan barely makes any difference.

Pure bullshit. And if you dont like the minor increase in humidity
levels which are in fact barely even measurable, the obvious
thing to do is to move some of that air out of that room, again,
by doing something as basic as leaving the door open etc.

 

[Rod Speed]

Not at 90° F.

Yes you do, tho its not a chill anymore.

 

[kony]

We have a A/C but it is old (20-30 years old) and it sucks. It doesn't blow much air
upstair because all the heat rises.

You can install an assist fan in the duct going up to your
room or at the vent itself. Another alternative is the
dampers sometimes installed already, either in the ducts or
at the vents, closing those some in areas that get best flow
will divert more flow elsewhere.

 

[kony]

Most fans aren't used to move air in or out, they only circulate it
within the room. And so the temperature always rises.


On the contrary, a person in hot air can lose a litre an hour through
perspiration, and in a normal room that raises humidity considerably,
just like a humidifier. It doesn't take long before the humidity is
so high that a fan barely makes any difference.

Untrue.

The increase in humidity is always a GOOD thing, as it is a
result of the person being cooled. That person being cooler
as a result of the perspiration evaporating off of them,
will then sweat less than if they were just drenched in
sweat without the fan.

Once the temp gets high enough a fan is not sufficient but
it is almost always better than no fan.

 

[kony]

Nope. In spades with that 'rapidly' claim.

Its just basic physics, the power that is used by the fan motor
has to end up in the air temp, there is nowhere else for it to go.

Of course there is somewhere for it to go. If the heat
didn't enter and leave the room, it would not have gotten up
to 90F in the first place.

 

[Rod Speed]

Of course there is somewhere for it to go.

I clearly said nowhere ELSE.

If the heat didn't enter and leave the room, it
would not have gotten up to 90F in the first place.

Pathetic, really.

 

[ANTant]

Presumably they dont spend as much time in the bedrooms
awake as he does and they spend most of their time
downstairs where the main A/C does have a reasonable effect.

Yep. I wished I had a basement!! I used to work in office basement. It was
awesome. No windows, much cooler during summer, etc.

It wasnt that unusual for A/C installed in those days
in europe to not attempt to A/C the entire house.

Yep, this wooden house was built back in the late 70s or early 80s.
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