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I guess "dry air" is a relative term. It looks as though the cooling
air only increases n2 volume RH by ~1%. So, in relation to the air
we breath, it's very dry air. In relation to the n2 supply, it's
not.<br>
<br>
Desiccants absorb H20 according to it's surface area and the time in
contact. To absorb H2O from two compressors supplying 1200 lpm air
flow each (90 cfm), a large surface area and sufficient contact time
is required. Typically, fairly large desiccant towers are used for
this. Dual towers with a regeneration cycle can offer continuous
operation. This unit would be too large to place on the top deck of
the fwd carriage. See a nice one in the below pic. <b>The biggest
drawback besides cost is that a 3rd air compressor would be
required to purge the H2O out of the offline towe</b>r. <br>
<br>
<img moz-do-not-send="false"
src="cid:part1.F7393B16.AA424FA7@jlab.org" alt="" height="722"
width="480"><br>
The Full Product Brochure<br>
<a class="moz-txt-link-freetext" href="https://www.ingersollrandproducts.com/content/dam/ir-products/en/100page/CAT/Desiccant%20Dryers%20Bochure.pdf">https://www.ingersollrandproducts.com/content/dam/ir-products/en/100page/CAT/Desiccant%20Dryers%20Bochure.pdf</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 5/10/2018 3:06 PM, Amrit Yegneswaran
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:513378101.8923411.1525979195140.JavaMail.zimbra@jlab.org">
<div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900">
<div>george,<br>
</div>
<div>the question is (as marco pointed out) once the air
compressor is off the humidity goes down. yeep its going down
because N2 is dry, which to me implies that the humidity is
in the air that is being pumped to the RICH (see brian's
email).<br data-mce-bogus="1">
</div>
<div>the inline desiccant query was for the air line and for use
during the run.<br data-mce-bogus="1">
</div>
<div>my guess is the air compressor is not really outputting dry
air.<br data-mce-bogus="1">
</div>
<div>anyway lets muse over it.<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>brian, what needs to be done to fully instrument the air
tank sensor so that the PV doesn't read 0 ppm?<br
data-mce-bogus="1">
</div>
<div>amrit<br data-mce-bogus="1">
</div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"George Jacobs"
<a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br>
<b>To: </b>"Amrit Yegneswaran" <a class="moz-txt-link-rfc2396E" href="mailto:yeg@jlab.org"><yeg@jlab.org></a>,
"dsg-rich" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-rich@jlab.org"><dsg-rich@jlab.org></a>, "Marco Mirazita"
<a class="moz-txt-link-rfc2396E" href="mailto:Marco.Mirazita@lnf.infn.it"><Marco.Mirazita@lnf.infn.it></a><br>
<b>Sent: </b>Thursday, May 10, 2018 1:39:59 PM<br>
<b>Subject: </b>Re: [Dsg-rich] Fwd: RICH humidity graph<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">Please remind me of the
sensor specs. isn't it only good down to 3% RH?<br style=""
data-mce-style="">
<br style="" data-mce-style="">
If this is the RICH nitrogen volume, why are we referring to
it as dry air? The nitrogen supply is dry, < 3 ppm. But,
the rate of H2O contamination from atmosphere is directly
proportional to ambient H2O levels. The N2 flow is currently
maxed out with the old N2 panel. The only way to increase N2
flow is to install the NEW panel.<br style=""
data-mce-style="">
<br style="" data-mce-style="">
Since the air is currently off, adding a desiccant will do
nothing?<br style="" data-mce-style="">
<br style="" data-mce-style="">
Perhaps both top and bottom garage doors are open in the hall?
Check hall humidity. The higher the humidity gets in the hall,
the higher it will go in the RICH. There should be a rule,
only 1 door open at a time like we tried to have for clas6.
With both doors open, hall humidity can reach to
outside/exterior levels. This has been an issue many times in
the past with clas6.<br style="" data-mce-style="">
<br style="" data-mce-style="">
Cheers,<br style="" data-mce-style="">
George<br style="" data-mce-style="">
<br style="" data-mce-style="">
<div class="moz-cite-prefix" style="" data-mce-style="">On <span
class="Object" id="OBJ_PREFIX_DWT208_com_zimbra_date">5/10/2018</span>
12:32 PM, Amrit Yegneswaran wrote:<br style=""
data-mce-style="">
</div>
<blockquote
cite="mid:1911902993.8878396.1525969946672.JavaMail.zimbra@jlab.org"
style="" data-mce-style="">
<div style="font-family: tahoma,new york,times,serif;
font-size: 14pt; color: rgb(0, 153, 0);"
data-mce-style="font-family: tahoma,new york,times,serif;
font-size: 14pt; color: #009900;">
<div style="" data-mce-style="">hi marco,</div>
<div style="" data-mce-style="">i couldn't see the graphs
in your email/log, so pete sent me the graphs.<br
style="" data-mce-style="">
</div>
<div style="" data-mce-style="">so, it appears the dry air
isn't dry !<br style="" data-mce-style="">
</div>
<div style="" data-mce-style=""><br style=""
data-mce-style="">
</div>
<div style="" data-mce-style="">brian/george,<br style=""
data-mce-style="">
</div>
<div style="" data-mce-style="">could one add an inline
desiccant<br style="" data-mce-style="">
</div>
<div style="" data-mce-style="">amrit<br style=""
data-mce-style="">
</div>
<hr id="zwchr" style="" data-mce-style="">
<div style="" data-mce-style=""><b style=""
data-mce-style="">From: </b>"Peter Bonneau" <span
class="Object"
id="OBJ_PREFIX_DWT209_ZmEmailObjectHandler"><a
class="moz-txt-link-rfc2396E"
href="mailto:bonneau@jlab.org" target="_blank"
style="" data-mce-href="mailto:bonneau@jlab.org"
data-mce-style="" moz-do-not-send="true"><bonneau@jlab.org></a></span><br
style="" data-mce-style="">
<b style="" data-mce-style="">To: </b>"Amrit
Yegneswaran" <span class="Object"
id="OBJ_PREFIX_DWT210_ZmEmailObjectHandler"><a
class="moz-txt-link-rfc2396E"
href="mailto:yeg@jlab.org" target="_blank" style=""
data-mce-href="mailto:yeg@jlab.org"
data-mce-style="" moz-do-not-send="true"><yeg@jlab.org></a></span><br
style="" data-mce-style="">
<b style="" data-mce-style="">Sent: </b><span
class="Object" id="OBJ_PREFIX_DWT211_com_zimbra_date">Thursday,
May 10</span>, 2018 9:25:48 AM<br style=""
data-mce-style="">
<b style="" data-mce-style="">Subject: </b>RICH
humidity graph<br style="" data-mce-style="">
</div>
<div style="" data-mce-style=""><br style=""
data-mce-style="">
</div>
<div style="" data-mce-style="">
<div style="font-family: arial,helvetica,sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);"
data-mce-style="font-family:
arial,helvetica,sans-serif; font-size: 12pt; color:
#000000;">
<div style="" data-mce-style="">Hi Amrit,<br style=""
data-mce-style="">
<br style="" data-mce-style="">
</div>
<div style="" data-mce-style="">Here is the RICH
humidity graph:<br style="" data-mce-style="">
</div>
<div style="" data-mce-style=""><br style=""
data-mce-style="">
</div>
<div style="" data-mce-style=""><img
class="image-style-plentybig"
title="/home/clasrun/screenshots/clonpcrich1_20180510_045809.gif"
style=""
src="https://logbooks.jlab.org/files/styles/plentybig/public/2018/05/3574284/clonpcrich1_20180510_045809.gif?itok=DJI_YiXl"
saveddisplaymode=""
data-mce-src="https://logbooks.jlab.org/files/styles/plentybig/public/2018/05/3574284/clonpcrich1_20180510_045809.gif?itok=DJI_YiXl"
data-mce-style="" moz-do-not-send="true"
height="489" width="885"></div>
</div>
<br style="" data-mce-style="">
</div>
</div>
<br style="" data-mce-style="">
<fieldset class="mimeAttachmentHeader"></fieldset>
<br style="" data-mce-style="">
<pre style="" data-mce-style="">_______________________________________________
Dsg-rich mailing list
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</pre>
</blockquote>
<br style="" data-mce-style="">
<pre class="moz-signature" style="" data-mce-style="">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) <span class="Object" id="OBJ_PREFIX_DWT214_com_zimbra_phone"><a href="callto:757-269-7115" onclick="window.top.Com_Zimbra_Phone.unsetOnbeforeunload()" data-mce-href="callto:757-269-7115" moz-do-not-send="true">757-269-7115</a></span>
(cell) <span class="Object" id="OBJ_PREFIX_DWT215_com_zimbra_phone"><a href="callto:757-876-0480" onclick="window.top.Com_Zimbra_Phone.unsetOnbeforeunload()" data-mce-href="callto:757-876-0480" moz-do-not-send="true">757-876-0480</a></span>
(email) <span class="Object" id="OBJ_PREFIX_DWT216_ZmEmailObjectHandler"><a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org" target="_blank" style="" data-mce-href="mailto:jacobsg@jlab.org" data-mce-style="" moz-do-not-send="true">jacobsg@jlab.org</a></span>
(website) <span class="Object" id="OBJ_PREFIX_DWT217_com_zimbra_url"><a class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank" style="" data-mce-href="https://userweb.jlab.org/~jacobsg" data-mce-style="" moz-do-not-send="true">https://userweb.jlab.org/~jacobsg</a></span>
</pre>
<br>
</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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