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<p class=MsoNormal>Hello<o:p></o:p></p>
<p class=MsoNormal>I am having difficulty understanding the idealized zone
control law response of a ‘Fixed heat injection’ and ‘Multi-stage
control with hysteresis’ when applied to my model.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>They appear to frequently use ½ the defined fixed
capacity and only under certain circumstances use the full capacity<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>The temperature differential is not set in the ‘fixed’
version, but appears to apply full capacity or half capacity depending on
temperature difference above setpoint, but also exhibits some PID response. <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>‘Multi’ also exhibits some interesting
things.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In addition, if the sensor is in one zone (e.g. main) and
the actuator is air point of two zones (e.g. main and bsmt) there is very odd
response of which gets heat injection, including the potential to be 150% of
specified capacity.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>My building time step is 10/hr. I am simply trying to model
a typical deadband thermostat in the main zone that controls a idealized plant
that has fixed ON capacity and injects heat to the main and basement zones
(preferably 60%/40% heat rate distribution to the zone of the fixed capacity).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thoughts?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Lukas Swan<o:p></o:p></p>
<p class=MsoNormal>Dalhousie Univ.<o:p></o:p></p>
<p class=MsoNormal>Canada<o:p></o:p></p>
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