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<p class="MsoNormal"><span style="color:#1F497D">Tom,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><br>
Here’s how I do it: (geez it looks long now that I’ve written it, but it’s really not bad and I feel it does a good job)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Determine your peak evaporation rate (lb/hr) for the pool(s) within the natatorium<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Should be available from the pool designers or if not, see the Natatorium section in ASHRAE Handbook – HVAC Applications section 5 (Places of Assembly).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Values will depend largely on water temperature and peak “Activity Factor” expected, but ballpark values are<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore"><span style="font:7.0pt "Times New Roman"">
</span>i.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:#1F497D">Lap pool: 0.05 lb/hr per ft² of water surface area<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore"><span style="font:7.0pt "Times New Roman"">
</span>ii.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:#1F497D">Leisure pool: 0.2 lb/hr per ft² of water surface area (warmer than lap and higher activity factor (more splashing = more evaporation))<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore"><span style="font:7.0pt "Times New Roman"">
</span>iii.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:#1F497D">Swirl or Hot Tub: 0.4 lb/hr per ft² of water surface area (hot, with jets)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Create a schedule to represent the pool evaporation rate during different usage scenarios (different activity factors, different evaporation rates).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">I use three modes of operation:
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore"><span style="font:7.0pt "Times New Roman"">
</span>i.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:#1F497D">Unoccupied and uncovered: approx. 0.3<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore"><span style="font:7.0pt "Times New Roman"">
</span>ii.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:#1F497D">Occupied and low use: approx. 0.7<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore"><span style="font:7.0pt "Times New Roman"">
</span>iii.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:#1F497D">Occupied and high use: 1.0<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Create an Internal Energy Source within your natatorium space with the magnitude equal to the peak evaporation rate, but in Btu/hr (1000 Btu/lb of water evaporating), and make the load 100% latent,
0% sensible like so: <o:p></o:p></span></p>
<p class="MsoListParagraph"><img width="649" height="119" id="Picture_x0020_1" src="cid:image001.png@01CF4B57.31AE05C0"><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Now create a process heating load on your heating water loop and apply the same schedule. The magnitude of the load is calculated as:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Pool water heat loss to evaporation (equal to evaporation “Internal Energy Source”), PLUS<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Heating energy required to heat the makeup water from DCW inlet up to pool water temperature. This is accounting for heating the fresh water that is replacing the water lost due to evaporation (in
the range of 140 Btu/hr per lb/hr of water depending on your makeup water and pool water temps)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Note that this assumes that 100% of the heat required for evaporation at the pool’s surface is provided by the pool water’s heat, where in reality it is expected that some component comes from the air,
though I expect it is a small component.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Set min and max RH in your AHU and you’re done.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">And if you felt there was significant heat loss through the pool wall to the ground, you could add that in as well, though I think that it probably isn’t when compared to the energy involved in evaporation.<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#1F497D">Riley Beise</span></b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#1F497D">, P.Eng., BEMP,
LEED Green Associate</span><span lang="EN-CA" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#1F497D">Energy Analyst</span><span lang="EN-CA" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D"> </span><span lang="EN-CA" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#17365D">AME Consulting Group</span></b><span lang="EN-CA" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-CA" style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:green">721 Johnson Street</span></b><span lang="EN-CA" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-CA" style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:green">Victoria, BC, V8W 1M8</span></b><span lang="EN-CA" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:green">p. 250-382-5999</span><span lang="EN-CA" style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="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"> RobertWichert [mailto:robert@wichert.org]
<br>
<b>Sent:</b> Saturday, March 29, 2014 8:44 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Natatorium/Pool<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Well, it's not EQuest, but it's on topic:<br>
<br>
<a href="http://energyexperts.org/CalculatorsTools/PoolEnergyUseCalculator.aspx">http://energyexperts.org/CalculatorsTools/PoolEnergyUseCalculator.aspx</a>
<br>
<br>
<br>
<br>
<o:p></o:p></p>
<pre>Robert Wichert P.Eng. LEED AP BD&C<o:p></o:p></pre>
<pre>+1 916 966 9060<o:p></o:p></pre>
<pre>FAX +1 916 966 9068<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
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<pre>===============================================<o:p></o:p></pre>
<p class="MsoNormal">On 3/28/2014 11:49 AM, Tom Mickley wrote:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Does anyone have a simple, easy way to model an in ground pool and spa for a natatorium?
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Tom Mickley<o:p></o:p></p>
<p class="MsoNormal">Mechanical Engineer CEM<o:p></o:p></p>
<p class="MsoNormal">The K Company<o:p></o:p></p>
<p class="MsoNormal">Cell 330-760-3994<o:p></o:p></p>
<p class="MsoNormal">Office 330-773-5125<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Equest-users mailing list<o:p></o:p></pre>
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<pre>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
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