<div dir="ltr">I can answer part of your question. The ET rate is provided in mm/day because it's used by farmers to determine how much water to apply to their crops. That's the depth of water required to offset the consumption by the plants. A typical value is 0.25 inch/day in hot weather, so a farmer would need to apply 1 inch of water if irrigating every four days. <div><br></div><div>For your purposes, you could multiply the ET rate by the the "footprint" area of the plants to get a rough water consumption rate. Of course the ET rate varies with the plant's environment: drybulb, wetbulb, airspeed, etc. </div><div><br></div><div>Seems reasonable that using that calculation would get you in the ballpark of the latent load from the plants. </div><div><br></div><div>-Erik</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><b>Erik Kolderup, PE, LEED AP</b><div><a href="mailto:erik@kolderupconsulting.com" target="_blank">erik@kolderupconsulting.com</a><span style="color:rgb(153,153,153)"> | 415.531.5198 | </span><a href="http://www.kolderupconsulting.com" target="_blank">www.kolderupconsulting.com</a><span style="color:rgb(153,153,153)"> </span><br></div></div></div></div>
<br><div class="gmail_quote">On Fri, May 29, 2015 at 11:04 AM, Singhal, Harshul <span dir="ltr"><<a href="mailto:HSinghal@thorntontomasetti.com" target="_blank">HSinghal@thorntontomasetti.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hi everyone, <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am modeling one greenhouse for which I need to manually calculate latent load through evapotranspiration rate through plants in the space. I came across with some research where they talked about calculating evapotranspiration rate in
mm/day or mm/hr. <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><a href="http://edis.ifas.ufl.edu/pdffiles/ae/ae45900.pdf" target="_blank">http://edis.ifas.ufl.edu/pdffiles/ae/ae45900.pdf</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">also, I got this software on “land & water division” website to calculate ET rate:
<a href="http://www.fao.org/nr/water/eto.html" target="_blank">http://www.fao.org/nr/water/eto.html</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Can someone please explain it to me if it makes sense to use this calculation for ET rate through crops in glass chamber? Why this unit is in mm/day (length/time unit)? Tried to look around but haven’t got the explanation. Why it’s not
some volume/time unit? Is it mm/day for every sq ft or every sq metre?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Some inputs will be very helpful here. Thanks<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Harshul Singhal, LEED AP BD+C</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<br>
Project Consultant <br>
Thornton Tomasetti <br>
386 Fore Street, Suite 401 <br>
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<b>T</b> <a href="tel:%2B1.207.245.6060" value="+12072456060" target="_blank">+1.207.245.6060</a> <b>F</b> <a href="tel:%2B1.207.245.6061" value="+12072456061" target="_blank">+1.207.245.6061</a> <br>
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HSinghal@ThorntonTomasetti.com <br>
<a href="http://www.ThorntonTomasetti.com" target="_blank">www.ThorntonTomasetti.com</a> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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