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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">My observations are that the air does heat up when compressed then cooled when it decompresses. For example, if you have a large take of compressed air used
to fill a small tank, the small tank heats up as it is filled and the large tank cools off as it does the filling of the small tank.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That would lead me to believe that, in the end, the air would be roughly the same temperature after it went through the compression then decompression as it
traveled through the bottles from outside to inside. The bottles might absorb some of the heat from the compressed air and then you would have a wall that is warmer than room. In the end, I don’t believe there would be much change in temperature in the room.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D">Christopher Jones, P. Eng.<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D">Rowan Williams Davies & Irwin Inc.</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D"><br>
<i>Consulting Engineers & Scientists</i><br>
901 King Street West, Suite 400, Toronto, Ontario, M5V 3H5<br>
<b>T:</b> (519) 823-1311 ext 2052 <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D">M:</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D"> (416) 697-0056
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Joe Huang via Equest-users<br>
<b>Sent:</b> Tuesday, July 19, 2016 8:54 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] How do you think about the no electricity Eco-Coolers from Bangladesh<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>I saw today the same technology also promoted on the CIBSE Bulletin Board even with a video "explaining" how it works (the plastic bottles supposedly "compresses and cools the air")<o:p></o:p></p>
<p>( <a href="https://www.linkedin.com/groups/75555/75555-6160367729091100672?midToken=AQF3zdCi1vKWLA&trk=eml-b2_anet_digest_of_digests-hero-8-view%7Ediscussion&trkEmail=eml-b2_anet_digest_of_digests-hero-8-view%7Ediscussion-null-bc6m0%7Eiqtrhngl%7Eh3">
https://www.linkedin.com/groups/75555/75555-6160367729091100672?midToken=AQF3zdCi1vKWLA&trk=eml-b2_anet_digest_of_digests-hero-8-view%7Ediscussion&trkEmail=eml-b2_anet_digest_of_digests-hero-8-view%7Ediscussion-null-bc6m0%7Eiqtrhngl%7Eh3</a> )<o:p></o:p></p>
<p>To me, this seems more like wishful thinking. My comment posted on the CIBSE Bulletin Board was:<o:p></o:p></p>
<p><span class="text">I don't understand how this would work from a thermodynamic point of view. There has to be some air velocity to begin with, in which case I can see how the bottles might channel the air flow resulting in higher air velocities coming out
of the bottle openings, but wouldn't the total amount of air flow be the same, or less than through the window opening with no obstruction? Also, someone explain to me how compressing the air will cool it?? I've always thought that compressing the air would
heat it up, although in this case the effect would be extremely minimal either way.</span><o:p></o:p></p>
<p><span class="text">Joe</span><o:p></o:p></p>
<pre>Joe Huang<o:p></o:p></pre>
<pre>White Box Technologies, Inc.<o:p></o:p></pre>
<pre>346 Rheem Blvd., Suite 205A<o:p></o:p></pre>
<pre>Moraga CA 94556<o:p></o:p></pre>
<pre><a href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a><o:p></o:p></pre>
<pre><a href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data<o:p></o:p></pre>
<pre>(o) (925)388-0265<o:p></o:p></pre>
<pre>(c) (510)928-2683<o:p></o:p></pre>
<pre>"building energy simulations at your fingertips"<o:p></o:p></pre>
<div>
<p class="MsoNormal">On 7/14/2016 7:22 PM, <span style="font-family:"MS Mincho"">
冷面寒</span><span style="font-family:"PMingLiU","serif"">枪</span> via Equest-users wrote:<o:p></o:p></p>
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<p class="MsoNormal">Recently,I read the news about the zero air cooler,<span style="font-size:10.5pt;font-family:"Verdana","sans-serif";background:white">which is made with re-purposed plastic bottles.And the new claims that it helps reduce indoor temperature
by 5 degrees centigrade.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Verdana","sans-serif";background:white">The making process is shown as following:</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Verdana","sans-serif";background:white"><img border="0" width="571" height="466" id="_x0000_i1025" src="cid:image001.jpg@01D1E260.7C354A20"></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Verdana","sans-serif";background:white"><img border="0" width="592" height="359" id="_x0000_i1026" src="cid:image002.jpg@01D1E260.7C354A20"></span><o:p></o:p></p>
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<p class="MsoNormal">I dout that very much.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">the Joule-Thomson Coefficient for air (mostly nitrogen) at 300K (27°C/80°F) is about 0.36K/bar. This means that at 300K a 1bar change in pressure equates to a 0.22K. The change in pressure required to get the 5°C (5K) reduction would therefore
be:<span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#141414"><br>
<br>
<span style="background:#FCFCFF">5 / 0.22 = 22.7bar</span></span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#141414;background:#FCFCFF"><img border="0" width="740" height="477" id="_x0000_i1027" src="cid:image003.jpg@01D1E260.7C354A20"></span><o:p></o:p></p>
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<p class="MsoNormal">So I think it is impossible the temperature drop will be up to 5 degrees centigrade after the air through the bottle.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">What do you think?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">------------------ <o:p></o:p></p>
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<p class="MsoNormal"><strong><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3366FF">Yongqing Zhao</span></strong><span style="font-size:10.5pt;font-family:"Verdana","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><strong><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#006600">Changsha Green Building & Energy Saving Technology CO.,LTD</span></strong><b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#006600"><br>
</span></b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3366FF">NO.438,Shaoshan Road,Changsha,Hunan,China<br>
Telephone:13574805636</span><span style="font-size:10.5pt;font-family:"Verdana","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3366FF"><a href="mailto:Email:zhaoyongqing1987@126.com">Email:zhaoyongqing1987@126.com</a></span><span style="font-size:10.5pt;font-family:"Verdana","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">
<a href="mailto:503271081@qq.com">503271081@qq.com</a></span><span style="font-size:10.5pt;font-family:"Verdana","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><br>
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<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Equest-users mailing list<o:p></o:p></pre>
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<p class="MsoNormal"><o:p> </o:p></p>
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