- #1
slicey
- 4
- 0
hi, I've got an unusual q. that i don't think computer forums
can handle. they know their watercooling very well and that's
what my question relates to. but more specifically it has to do with
system effects of ducted DC fans(thermodynamics). you see, i want to cool my
pc with a watercooling circuit, consisting of a pump, heater
core, CPU waterblock and one or both of my 6.75",24V, 283CFM,
.75"H2o Papst fans. the purpose is low noise output/cost.
here's the deal, I'm trying to design a wood enclosure, that
contains a 6" by 11" by 2"(louvered fin portion) heater core.
all the watercooler boxes I've seen, the builders, just mount
the fan(s) and radiator/core to the exterior walls of their
external boxes. this allows the noise from the fan(s) a more
direct path back to your ears. same goes for the fan sound
coming through the core as well. this will not do. OK, so i
spent a few weeks learning a little about what you guys/girls
know. keeping the airflow velocity low, helps to keep the
sound level down. no turns in the ducting, something like
2.0-2.5x the fan dia., by inlet or outlet. air in a duct
doesn't like being squeezed or expanded suddenly. i could go
on, but you know this stuff a lot better than i do. don't
leave this post yet, please. what i had in mind before my
research enlightened me some, was to have a core installed in
a ducted inlet/outlet, where the air pathway went back and
forth at least once, on both sides of the core after
entering/exiting the enclosure. i hope that made sense, for i
know not how to import and post a pic. because of what i
learned, i violated many of the rules of system airflow and
noise. and the part i just don't know, but I'm hoping someone
can tell me if I'm right or wrong is this; i have two of these
fans that can really move a lot of air each(in parallel, a
whole lot). also, in series they can provide greater pressures
and i understand these facts only apply to a properly,
respectively matched system, impedance wise. but these fans
won't need to run anywhere near 24volts, even at my 5000ft.
elevation in order to properly cool the water passing through
my core, which is why I've already built a variable DC supply.
CAN'T I STILL JUST BUILD MY ORIGINAL DUCTED ENCLOSURE, THE WAY
I DESCRIBED, WHICH I THINK WILL STILL DO A BETTER JOB OF
ACOUSTICALY ISOLATING THE SYSTEM NOISE FROM REACHING MY EARS?
there i finally asked my "question", almost. i mean from what
i learned, the ducting should be straight before and after any
fans and be long enough to allow the airflow to develop a
smooth(laminar?) flow, also, without any obstructions near the
duct's inlet/outlet? i know there's more to it but that's the
basics of what i learned. I'm just a landscaper. i do hope you
can help me, not many people ever respond to my questions in
the computer forums.
thank you! slicey
can handle. they know their watercooling very well and that's
what my question relates to. but more specifically it has to do with
system effects of ducted DC fans(thermodynamics). you see, i want to cool my
pc with a watercooling circuit, consisting of a pump, heater
core, CPU waterblock and one or both of my 6.75",24V, 283CFM,
.75"H2o Papst fans. the purpose is low noise output/cost.
here's the deal, I'm trying to design a wood enclosure, that
contains a 6" by 11" by 2"(louvered fin portion) heater core.
all the watercooler boxes I've seen, the builders, just mount
the fan(s) and radiator/core to the exterior walls of their
external boxes. this allows the noise from the fan(s) a more
direct path back to your ears. same goes for the fan sound
coming through the core as well. this will not do. OK, so i
spent a few weeks learning a little about what you guys/girls
know. keeping the airflow velocity low, helps to keep the
sound level down. no turns in the ducting, something like
2.0-2.5x the fan dia., by inlet or outlet. air in a duct
doesn't like being squeezed or expanded suddenly. i could go
on, but you know this stuff a lot better than i do. don't
leave this post yet, please. what i had in mind before my
research enlightened me some, was to have a core installed in
a ducted inlet/outlet, where the air pathway went back and
forth at least once, on both sides of the core after
entering/exiting the enclosure. i hope that made sense, for i
know not how to import and post a pic. because of what i
learned, i violated many of the rules of system airflow and
noise. and the part i just don't know, but I'm hoping someone
can tell me if I'm right or wrong is this; i have two of these
fans that can really move a lot of air each(in parallel, a
whole lot). also, in series they can provide greater pressures
and i understand these facts only apply to a properly,
respectively matched system, impedance wise. but these fans
won't need to run anywhere near 24volts, even at my 5000ft.
elevation in order to properly cool the water passing through
my core, which is why I've already built a variable DC supply.
CAN'T I STILL JUST BUILD MY ORIGINAL DUCTED ENCLOSURE, THE WAY
I DESCRIBED, WHICH I THINK WILL STILL DO A BETTER JOB OF
ACOUSTICALY ISOLATING THE SYSTEM NOISE FROM REACHING MY EARS?
there i finally asked my "question", almost. i mean from what
i learned, the ducting should be straight before and after any
fans and be long enough to allow the airflow to develop a
smooth(laminar?) flow, also, without any obstructions near the
duct's inlet/outlet? i know there's more to it but that's the
basics of what i learned. I'm just a landscaper. i do hope you
can help me, not many people ever respond to my questions in
the computer forums.
thank you! slicey