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<TITLE>Demand limiting / peak-shaving</TITLE>
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<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Has anyone successfully</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">implemented demand limiting</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">?</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">The project I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m working on has a pretty extreme demand ratchet</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">,</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">and there appears to be significant cost savings to be had if I can reduce my peaks.</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> </SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">It looks like the load management feature will have</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">a</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">“</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">peak shaving</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">”</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> option in a future version</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">, although I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m not entirely sure it</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">s what I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m looking for either.</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m hoping to</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">modify temperature settings at the zone level and have the reduced load</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">“</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">trickle down</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">”</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> to my</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">AHU</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">s and</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">plant.</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">d like to avoid resetting my plant, only to have my fans</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">speed</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> up to compensate.</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">This is essentially the idea:</FONT></SPAN></P>
<UL DIR=LTR><UL DIR=LTR>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">Each zone will have 3</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">temperature setpoints</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">: Normal,</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">first stage</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">demand limit,</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">second stage</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> demand limit. Each zone can be programmed individually, so critical zones will have all three setpoints at the normal level. As the</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> building</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> demand approaches</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">a</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> setpoint, the</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">first stage</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> limiting setpoints will override the normal setpoints</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">(</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">approximately 2F warmer</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">. If the demand continues to rise towards the setpoint, all zones will be adjusted upwards again to their</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">second stage</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> limiting setpoint</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">(</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">approximately 4F warmer than normal setpoint</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">.</FONT></SPAN></P>
</UL></UL>
<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Ultimately, I think I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m going to need to build a schedule that has user expressions</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> for</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">my summer daytime</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> hours.</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">Unfortunately, I really don</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">t know what I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m doing with user expressions</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">…</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">ve set</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">5</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> global parameters</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> for easy modification</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">:</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">RegTemp=74</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">DemTemp1=76</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">DemTemp2=</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">78</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">kWlimit1=</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">700</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">kWlimit2=750</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">And then I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m going to insert the following into my temperature schedules</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> (#VALUE</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">is the variable I</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m looking for)</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">{</FONT></SPAN><SPAN LANG="en-us"><B><FONT FACE="Calibri">if</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> (</FONT></SPAN><SPAN LANG="en-us"><B><FONT FACE="Calibri">#VALUE</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"><#PA(</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">“</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">kWlimit1</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">”</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)<BR>
</FONT></SPAN><SPAN LANG="en-us"><B> <FONT FACE="Calibri">then</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">#PA(</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">“</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">RegTemp</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">”</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><BR>
<FONT FACE="Calibri"> </FONT></SPAN><SPAN LANG="en-us"><B> <FONT FACE="Calibri">else</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> </FONT></SPAN><SPAN LANG="en-us"><B> <FONT FACE="Calibri">if</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> (</FONT></SPAN><SPAN LANG="en-us"><B><FONT FACE="Calibri">#VALUE</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"><</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">#PA(</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">“</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">kWlimit</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">2</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">”</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><BR>
<FONT FACE="Calibri"> </FONT></SPAN><SPAN LANG="en-us"><B> <FONT FACE="Calibri">then</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">#PA(</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">“</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">DemTemp1</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">”</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><BR>
<FONT FACE="Calibri"> </FONT></SPAN><SPAN LANG="en-us"><B> <FONT FACE="Calibri">else</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">#PA(</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">“</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">DemTemp2</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">”</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><BR>
<FONT FACE="Calibri"> </FONT></SPAN><SPAN LANG="en-us"><B> <FONT FACE="Calibri">endif</FONT></B></SPAN><SPAN LANG="en-us"><BR>
<B><FONT FACE="Calibri">endif}</FONT></B></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">What can</FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">I replace</FONT></SPAN><SPAN LANG="en-us"><B> <FONT FACE="Calibri">#VALUE</FONT></B></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">with that</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">s going to call up this hour</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">’</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">s (or last hours</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"></FONT></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">demand?</FONT></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> Will this work?</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Thanks!</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Eric</FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
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