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<p class="MsoNormal">Hello everyone,<o:p></o:p></p>
<p class="MsoNormal">I got the following comment from a LEED reviewer, and was hoping you guys could help me out.
<o:p></o:p></p>
<p class="MsoNormal"><i><span style="background:silver;mso-highlight:silver">“It is unclear whether the Baseline case fan air flow rates were sized based on a 20 deg. F supply-air-to-room-air temperature difference for each Baseline system because using the
sensible heat equation (Q = 1.08*CFM*deltaT) with the total cooling capacity of 1,103,721 Btuh and total supply airflow of 15,656 CFM reported in Table 1.4.7A, it appears that a temperature difference of 65 deg. F was used. Update the model, provide input
summary reports showing that the Baseline case air flow rates were sized based on a 20 deg. F supply-air-to-room-air temperature difference per G3.1.2.8, update Supplemental Table 1.4 to reflect the total Baseline Case air flow, and update the form to reflect
any changes made.</span></i><i>”<o:p></o:p></i></p>
<p class="MsoNormal"><i><o:p> </o:p></i></p>
<p class="MsoNormal">The zone temperature is set to 75F and the MIN-SUPPLY-T is set to 55F, therefore it should be sized based on the 20 degree difference if I leave the airflow to be estimated automatically, am I correct?<o:p></o:p></p>
<p class="MsoNormal">The other issue is that the reviewer seems to be estimating the temperature difference using the sensible heat equation with the total cooling capacity, which is incorrect, right? If I use the sensible heat capacity, as it should be in
the equation, the temperature difference drops to 30F; which is still high and I intend to correct it, but it is not 65F as mentioned by the reviewer.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I really appreciate your help.<o:p></o:p></p>
<p class="MsoNormal"><span lang="ES-CR">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES-CR"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:150%"><b><span lang="ES-CR" style="font-size:10.0pt;line-height:150%;font-family:"Verdana","sans-serif";mso-fareast-language:ES"> Ing. Gastón Michaud F.
</span></b><b><span lang="ES-CR" style="font-size:10.0pt;line-height:150%;font-family:"Verdana","sans-serif";mso-fareast-language:ES"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="ES-CR" style="font-size:10.0pt;font-family:"Verdana","sans-serif""> Tel.: (506) 2222-7529<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES-CR" style="font-size:10.0pt;font-family:"Verdana","sans-serif""> Fax: (506) 2256-5608<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES-CR" style="font-size:10.0pt;font-family:"Verdana","sans-serif""> From USA: 1-305-433-3668</span><span lang="ES-CR" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
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</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif"">San José, Costa Rica</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif""><o:p></o:p></span></p>
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