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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><i>“and can you explain this "<o:p></o:p></i></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You are losing mixed air at the outdoor air rate to exfiltration or adjacent spaces. I don’t think you can model this aspect with eQuest, eQuest will do what it does here. </span><o:p></o:p></i></p><p class=MsoNormal><i>"clealy for me . i am sorry i can't understand well.” <o:p></o:p></i></p><p class=MsoNormal><i><o:p> </o:p></i></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Just ignore what I said about exfiltration due to pressurization here, I was talking too much.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i> “and i don' t want outdoor air flow through FCU. becase outdoor air needn't be processed , and it will lead to increse of fan energy. if equest do not do it as my thought ,then any good ways can reduce the increase of fan energy?”</i><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></i></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>From a couple of emails earlier; “<i>Regarding the fan power. If we assume that both fans and fan motors have the same efficiency and the units are constant volume, then you will adjust the static pressure of your fan coil units by the current flow over the new flow when you add the outside air. </i><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> i.e. if you have two FCU’s current supplying 2000 cfm and you have a 1000 cfm outside air unit delivering 500 cfm to each FCU, then your new FCU supply air rate will be 2500 cfm. You will build your DOAS as is designed and you will bump up your FCU airflow quantity to the total of the design and the DOAS supply to that space/zone/system. You will then reduce your static pressure for the FCU by 2000/2500 or 80% of what it is designed at, if the design total static is 4 inches then your new static will be 3.2 inches. This will eliminate any increase in fan power that you may see to the increased flow. (If you have ten FCUs at 2000 cfm and a DOAS at 2000 cfm, your numbers with the DOAS would be, DOAS as designed, 2200 cfm for each FCU, and a new total static pressure at 2000/2200 of design or 90.9% of design static).”</span><o:p></o:p></i></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The statement above is so you won’t see an increase in fan energy when bringing the OA through the fan coil units. You can’t assign 2 systems to 1 zone but you should still model the total airflow (FCU plus OA in the zone) into the zone to better model the proper behavior of the space thermal conditions.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>And, setting the FCU leaving air conditions to point “O” at the higher airflow quantity will give a close approximation of the coil load, (instead of using point “L” with the higher airflow quantity which will overestimate coil load and cooling/heating energy)<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'>There is another way to separate the two systems, FCU and DOAS, but involves a different kind of “dummy zone” with the DOAS assigned to it and you will have to schedule your DOAS operation. I personally don’t like this method because it does not properly simulate the space conditions, so I will not explain it here. </span><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'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'>Joe Fleming, E.I., LEED AP BD+C, BEMP<o:p></o:p></span></b></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><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> tiejun hu [mailto:hutiejun1223@126.com] <br><b>Sent:</b> Thursday, April 14, 2011 12:03 PM<br><b>To:</b> Joe Fleming<br><b>Cc:</b> 'equest-users'<br><b>Subject:</b> Re:RE: RE: RE: [Equest-users] FC+DOAS<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal> i have known setting "dummy" space. and can you explain this "<o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You are losing mixed air at the outdoor air rate to exfiltration or adjacent spaces. I don’t think you can model this aspect with eQuest, eQuest will do what it does here. </span><o:p></o:p></p><div><p class=MsoNormal>"clealy for me . i am sorry i can't understand well. <o:p></o:p></p></div><div><p class=MsoNormal> the process of DOAS is From W to S, which handled by AHU. and i don' t want outdoor air flow through FCU. becase outdoor air needn't be processed , and it will lead to increse of fan energy. if equest do not do it as my thought ,then any good ways can reduce the increase of fan energy?<o:p></o:p></p></div><p class=MsoNormal><br>At 2011-04-14 23:35:44<span lang=ZH-CN>，</span>"Joe Fleming" <<a href="mailto:joe@thespinnakergroupinc.com">joe@thespinnakergroupinc.com</a>> wrote:<br><br><o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>As Arpan stated, we are assuming you know how to set-up the “dummy” space and zone. Also, if you aren’t aware, you cannot assign two (2) systems to a single (1) zone.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>With the information you have provided below it appears that the DOAS is adding some load to the FCU and handling some load itself. Point “S” is warmer than the room set-point “N”. If this is the case then the leaving air conditions of your DOAS in eQuest should match the leaving air conditions of your design DOAS. If the DOAS is delivering 78 degF air at 50% rh in the design, then you should set your DOAS up in eQuest with those leaving air conditions. Your FCUs will receive air at those conditions at the quantity specified in your OA input. </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You are losing mixed air at the outdoor air rate to exfiltration or adjacent spaces. I don’t think you can model this aspect with eQuest, eQuest will do what it does here. </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The difference in airflows and leaving air conditions though the FCUs in the design and in the eQuest model will be the outdoor air rate. i.e. an FCU in the engineered design has 2000 cfm delivered at point “L” and the zone it serves has 500 CFM delivered to it from the DOAS at point “S”, your FCU in eQuest will have 2500 cfm delivered to the zone at mixed air conditions or point “O”.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>One more important item is, what is the process your DOAS goes through? Is it simply using an ERV to remove some enthalpy (db and wb) from the outdoor air? Or is it bringing the air to its dewpoint and then reheating it before delivery to the space? Sorry that I am not able to gather this from your chart.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'> </span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'>Joe Fleming, E.I., LEED AP BD+C, BEMP</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> tiejun hu [mailto:<a href="mailto:hutiejun1223@126.com">hutiejun1223@126.com</a>] <br><b>Sent:</b> Thursday, April 14, 2011 11:02 AM<br><b>To:</b> Joe Fleming<br><b>Cc:</b> 'equest-users'<br><b>Subject:</b> Re:RE: RE: [Equest-users] FC+DOAS</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>this is a phychrometric chart, y axes is "enthalpy" <span lang=ZH-CN>；</span>x axes has 145 <span lang=ZH-CN>°</span>angle with the y axis <span lang=ZH-CN>，</span>stand for "humidity". N stand for indoor Indoor State point; W stand for outdoor state point; S stand for state point which belong to outdoor air processed by DOAS. L stand for state point processed by FCU.; O stand for mix point between S and L.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> S' enthalpy value = N' enthalpy value<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>At 2011-04-14 22:12:25<span lang=ZH-CN>，</span>"Joe Fleming" <<a href="mailto:joe@thespinnakergroupinc.com">joe@thespinnakergroupinc.com</a>> wrote: <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt' id=isReplyContent><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regarding the fan power. If we assume that both fans and fan motors have the same efficiency and the units are constant volume, then you will adjust the static pressure of your fan coil units by the current flow over the new flow when you add the outside air. </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>i.e. if you have two FCU’s current supplying 2000 cfm and you have a 1000 cfm outside air unit delivering 500 cfm to each FCU, then your new FCU supply air rate will be 2500 cfm. You will build your DOAS as is designed and you will bump up your FCU airflow quantity to the total of the design and the DOAS supply to that space/zone/system. You will then reduce your static pressure for the FCU by 2000/2500 or 80% of what it is designed at, if the design total static is 4 inches then your new static will be 3.2 inches. This will eliminate any increase in fan power that you may see to the increased flow. (If you have ten FCUs at 2000 cfm and a DOAS at 2000 cfm, your numbers with the DOAS would be, DOAS as designed, 2200 cfm for each FCU, and a new total static pressure at 2000/2200 of design or 90.9% of design static).</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>As for the process, you say isenthalpic, so to me that means that the air is delivered off of the evaporator coil after the refrigerant goes through an expansion valve? </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Or could you please tell us what N, L, O, S, and W stand for, and what the axes of this chart are, (temperature and entropy?) It doesn’t look like a psychrometric chart.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'> </span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'>Joe Fleming, E.I., LEED AP BD+C, BEMP</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> tiejun hu [mailto:<a href="mailto:hutiejun1223@126.com">hutiejun1223@126.com</a>] <br><b>Sent:</b> Thursday, April 14, 2011 9:40 AM<br><b>To:</b> Joe Fleming<br><b>Cc:</b> 'equest-users'<br><b>Subject:</b> Re:RE: [Equest-users] FC+DOAS</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><br>At 2011-04-14 21:03:47<span lang=ZH-CN>，</span>"Joe Fleming" <<a href="mailto:joe@thespinnakergroupinc.com">joe@thespinnakergroupinc.com</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Search DOAS in the user archives and you will find a <b>bunch</b> of discussions on this topic.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>First you need to be in detailed mode, for some reason the DOE engine (maybe just eQuest), doesn’t have the skills to make a dedicated outdoor air system as a drop down selection. </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Next, what is the supply air temperature entering the zones from the DOAS? Cold? Room temperature? Hot?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What is the process that the DOAS goes through to get the leaving air temperature at set-point?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Typically, you need to create a “dummy space” and assign it to a “dummy zone” then assign your first system to this zone. If you already created systems you can always open your .inp file and cut and paste the DOAS to the top of the systems list so that it will become your first system. Go ahead and assign all of the outside air to your DOAS “dummy zone” and then choose outside air from system for all of the systems that this DOAS serves. It will only be able to find OA from systems above it on the component tree, so make sure your DOAS is at the top.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'> </span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#74BD4B;mso-fareast-language:EN-US'>Joe Fleming, E.I., LEED AP BD+C, BEMP</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>tiejun hu<br><b>Sent:</b> Thursday, April 14, 2011 1:11 AM<br><b>To:</b> equest-users<br><b>Subject:</b> [Equest-users] FC+DOAS</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>hi equesters<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> Dose anybody have experiences for FC+DOAS, in my modle, outdoor air processed by independent air-condition unit, then supplied to room directly, do not go through FC inlet. as far as i kown, outdoor air and return air combined process in FC in some countries,like below picture<img border=0 width=600 height=362 id="_x0000_i1025" src="cid:image001.jpg@01CBFAA4.E20C0450">but On the upper right corner,i see an outdoor air fan, is it an DOAS? if so ,how to realize it in equest? and how to set in the tab "OA FROM SYSTEM"?<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> any words will be appreciated!<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> yours sincere<o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> hi joe<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> thanks for your reply,this is my Processing,<img border=0 width=285 height=235 id="_x0000_i1026" src="cid:image002.jpg@01CBFAA4.E20C0450">, independent outdoor air from DOAS are processed to S( isenthalpic with room N<span lang=ZH-CN>，</span>H:90%), then mixed with supply air from FC outnet(L), outdoor air doesn't undertake indoor load. Note that: my outdoor air do not get through FC, delivered to room derectly.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> i doubt that , as your method, Whether outdoor air from DOAS will be delivered to FC, flow through the fan in FC, then increase fan energy?<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> thanks again!<o:p></o:p></p></div></div></blockquote><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div></body></html>