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<div class="moz-cite-prefix">These guys seem to have installed a
Hypoxic system recently. Would there environment be small enough
to meet the fresh air ingress requirements or would the system
just be running all the time in a battle between the fresh air and
putting converting it with nitrogen. <br>
<br>
<a class="moz-txt-link-freetext" href="http://aragroupblog.com.au/?p=2420">http://aragroupblog.com.au/?p=2420</a><br>
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On 13/01/14 8:54 PM, Tony de Francesco wrote:<br>
</div>
<blockquote
cite="mid:CAFoQ9-i6cLckkEV5++9T8XDoNa6yhdR3JKpKgDLNzDCLLwFTaw@mail.gmail.com"
type="cite">
<p dir="ltr">Just to clarify the australian BCA requirements: all
habitable spaces including machine rooms, switchrooms, etc. must
be provided with fresh outside air. The levels required are
stipulated in AS1668 but typically work out at around 1 l/s per
m2 for most data centre spaces. </p>
<p dir="ltr">Hospital operating theatres are actually provided
with 100% outside air via HEPA filtration with surrounding
service corridors kept at approx -ve 20Pa pressure to ensure
that no "dirty" air enters the theatre.</p>
<p dir="ltr">Even if it was not a BCA requirement there is a need
for fresh outside air in a data centre keep ot at a higher
pressure than surround areas to ensure that "dirty" air does not
enter the technical space.<br>
</p>
<p dir="ltr">Regards</p>
<p dir="ltr">Tony de Francesco<br>
Technical Director<br>
P.U.E. Pty Ltd<br>
Mob: +61 (0) 457 701 179<br>
Email: <a moz-do-not-send="true" href="mailto:tonyd@pue.com.au">tonyd@pue.com.au</a></p>
<div class="gmail_quote">On 13/01/2014 8:13 PM, "Matt Perkins"
<<a moz-do-not-send="true" href="mailto:matt@spectrum.com.au">matt@spectrum.com.au</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>That's good info Bevan, <br>
I wonder if the building code requires that fresh air be
injected into the entire building or all rooms within the
building. I wonder if Hypoxic fire prevention could be
employed in small computer room type environments or data
centers where division into smaller rooms or where
cold/hot aisle for example. I guess not useful�
information for centers with large floor plates but may be
useful in power room environments or small server rooms
etc.� If the building code allows. <br>
<br>
Operating theaters for example dont have fresh air
injected into them. It's a highly filtered air that's
injected from the outer rooms surrounding the theater
through HEPA and active charcoal.� What counts as fresh
air. <br>
<br>
These guys make an interesting device. <a
moz-do-not-send="true"
href="http://altitudetraining.com/prevenex/products/airunit"
target="_blank">http://altitudetraining.com/prevenex/products/airunit</a><br>
<br>
Matt.<br>
<br>
<br>
�� On 13/01/14 7:07 PM, Bevan Slattery wrote:<br>
</div>
<blockquote type="cite">
<div><br>
</div>
<div><br>
</div>
<span>
<div style="border-right:medium
none;padding-right:0in;padding-left:0in;padding-top:3pt;text-align:left;font-size:11pt;border-bottom:medium
none;font-family:Calibri;border-top:#b5c4df 1pt
solid;padding-bottom:0in;border-left:medium none">
<span style="font-weight:bold">From: </span> Tony de
Francesco <<a moz-do-not-send="true"
href="mailto:tonyd@pue.com.au" target="_blank">tonyd@pue.com.au</a>><br>
</div>
<p dir="ltr">> Yes but Inergen is not used in large
DCs because of the volume required.</p>
</span>
<div>Simply not correct. �Most large DC�s segregate spaces
to allow full discharge in a specific area.</div>
<span>
<p dir="ltr">> The European system is a hypoxic
system at low pressure. Very different to dumping a
whole bunch of gas through high pressure nozzles.</p>
</span>
<div>Challenge with this system in Australia (which I
looked at early in NEXTDC days) was that in Australia
you need to continually supply fresh air to a DC under
the building code. �It is difficult to continually
deliver a hypoxic environment across a large facility
considering the Australian standards and the need to
continually extract O2/Inject N2 into the air supply.</div>
<div><br>
</div>
<div>Hypoxic systems are typically used in things like
ship engine rooms to reduce the risk of catastrophic
fire or in environments with low traffic flow
(archives). �In a colocation environment in Australia I
couldn�t get an insurer to get their head around having
staff and customers in a facility with a reduced O2, let
alone the technical issues around a requirement to
continually alter the air mix due to the building code.</div>
<div><br>
</div>
<div>So if you want to maintain a lower level of O2 you
had to operate the Agent Generator (essentially lower O2
in a bottle) 24/7 to maintain the O2 levels at the Fire
Type 2 levels. �The amount of fresh air required in a
20,000m facility that had a volumetric size of 100
megalitres is �significant�. �Very significant.</div>
<div><br>
</div>
<div>All in all it wasn�t technically or commercially
viable for NEXTDC at the time to provide a continuous
hypoxic environment. �This may have changed. �There was
some investigation into using an agent generator to
create the refill in case of discharge removing the need
for a refill from alternate gas suppliers. �But the
equipment needed to refill 20 megalitres (hall discharge
+1) was significant and the bottles required was
considerably greater from memory. �Also not all gas
discharge systems are as high pressure these days so you
may want to check out the latest to ensure your points
are valid.</div>
<div><br>
</div>
<div>Cheers</div>
<div><br>
</div>
<div>[b]</div>
<div><br>
</div>
<div><br>
</div>
<span>
<p dir="ltr"><br>
</p>
<p dir="ltr"><br>
</p>
</span> <br>
<fieldset></fieldset>
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