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Hi Valery,<br>
<br>
Have you taken into account the length of the hose or tubing that
must be added in order to attach the fan to the detector? If the
overall line length must be doubled or tripled to reach the fan, the
flow restriction from the tubing will also double or triple.<br>
<br>
If the fan stops running, the fan blades will restrict the gas flow
at some level. Flowing gas has velocity and momentum, fan blades
will require the gas change direction, loosing momentum and
velocity. <br>
<br>
So, there will be additional flow restriction and it will increase
the cooling air pressure in the electronics box in the case of fan
failure. The added restriction due to the additional lengths of
tubing or hose can be calculated. The additional restriction created
by the fan blades can be physically tested by turning off the fan
and monitoring the change in the exhaust line pressure.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 10/17/2017 4:27 PM, Valery
Kubarovsky wrote:<br>
</div>
<blockquote type="cite"
cite="mid:494352099.5668846.1508272051201.JavaMail.zimbra@jlab.org">
<div style="font-family: arial,helvetica,sans-serif; font-size:
12pt; color: #000000">
<div>George,</div>
<div><br data-mce-bogus="1">
</div>
<div>First we want to test it at the cleaning room to measure
the effectiveness of these fans.</div>
<div>And later on we will use it in the hall. </div>
<div><br data-mce-bogus="1">
</div>
<div>The design of the cooling system was done without exhaust
fans. In case of the power failure nothing will happen with
the pressure system. The fan has much bigger diameter than our
tubes and by this reason will not block the air flow. It is
completely open.</div>
<div><br data-mce-bogus="1">
</div>
<div>Regards,</div>
<div>Valery</div>
<div><br data-mce-bogus="1">
</div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__">
<blockquote style="border-left:2px solid
#1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"
data-mce-style="border-left: 2px solid #1010FF; margin-left:
5px; padding-left: 5px; color: #000; font-weight: normal;
font-style: normal; text-decoration: none; font-family:
Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"George
Jacobs" <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br>
<b>To: </b>"Tyler Lemon" <a class="moz-txt-link-rfc2396E" href="mailto:tlemon@jlab.org"><tlemon@jlab.org></a>,
"dsg-rich" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-rich@jlab.org"><dsg-rich@jlab.org></a><br>
<b>Sent: </b>Tuesday, October 17, 2017 1:20:12 PM<br>
<b>Subject: </b>Re: [Dsg-rich] MVT exhaust fan in EEL 124<br>
</blockquote>
</div>
<div data-marker="__QUOTED_TEXT__">
<blockquote style="border-left:2px solid
#1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"
data-mce-style="border-left: 2px solid #1010FF; margin-left:
5px; padding-left: 5px; color: #000; font-weight: normal;
font-style: normal; text-decoration: none; font-family:
Helvetica,Arial,sans-serif; font-size: 12pt;">Would this
setup be used only in the clean room for testing or would
this be for use in the hall during normal operations?<br>
<br>
If the answer is the latter, what would happen to air
cooling flow and pressure if the power to the fans tripped
off during a run? <br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 10/17/2017 11:56 AM, Tyler
Lemon wrote:<br>
</div>
<blockquote
cite="mid:1154990717.5595054.1508255789019.JavaMail.zimbra@jlab.org">
<div style="font-family: times new roman,new
york,times,serif; font-size: 12pt; color: #000000"
data-mce-style="font-family: times new roman,new
york,times,serif; font-size: 12pt; color: #000000;">
<div>Hello Valery,<br>
</div>
<div><br>
</div>
<div>Attached is the photo of the MVT exhaust fan in use
in EEL 124.<br>
</div>
<div><br>
</div>
<div>Would there be a possibility that RICH would use
similar fans to pull out the hot air from the
electronic panel?<br>
</div>
<div><br>
</div>
<div>Best regards,<br>
</div>
<div>Tyler<br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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</pre>
</blockquote>
<br>
<pre class="moz-signature">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org" target="_blank" data-mce-href="mailto:jacobsg@jlab.org" moz-do-not-send="true">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank" data-mce-href="https://userweb.jlab.org/~jacobsg" moz-do-not-send="true">https://userweb.jlab.org/~jacobsg</a></pre>
<br>
_______________________________________________<br>
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<a class="moz-txt-link-abbreviated" href="mailto:Dsg-rich@jlab.org">Dsg-rich@jlab.org</a><br>
<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/dsg-rich">https://mailman.jlab.org/mailman/listinfo/dsg-rich</a><br>
</blockquote>
</div>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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