<div dir="ltr">Luca,<div><br></div><div>The COOL-CTRL-RANGE is a parameter used to model the proportional offset for a controller which controls the cooling coil. In a system with variable air volume and a chilled water valve, there are two methods for modulating cooling capacity: i.e. you can reduce the air flow or reduce the water flow. Since you have two actions to modulate capacity, you need two independent setpoints to control these actions. Typically, the cooling coil valve is controlled to maintain a supply air temperature setpoint. If you don't specify a supply air reset method, the supply temperature setpoint is the "Zone Entering Min Supply Temp" (MIN-SUPPLY-T in BDL) parameter which defaults to 55 deg-F. So, if you were to specify a COOL-CTRL-RANGE of 4 deg-R, the controller will call for 100% action at 57 deg-F and 0% action at 53 deg-F. This is what is meant by Tmax and Tmin: they are the cooling supply setpoint + or - 1/2 the control range. The air flow is then modulated to meet the space temperature setpoints given the supply temperature. 9 deg-F seems a little high for any system. You typically see a range of only a few degrees in practice, unless there is something wrong with the controls.</div>
<div><br></div><div>Aaron<br clear="all">
<div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">Hello all, </div><div style="font-family:arial,sans-serif;font-size:13px">
<br></div><div style="font-family:arial,sans-serif;font-size:13px">I am modelling a building in eQuest: I am not really sure what the COOL-CTRL-RANGE parameter refers to.</div><div style="font-family:arial,sans-serif;font-size:13px">
In the eQuest tutorial it says: "Throttling range of the cooling coil controller. It equals Tmax - Tmin where Tmax is the temperature of the coil when it is fully loaded and Tmin is the temperature of the coil when it is fully unloaded."</div>
<div style="font-family:arial,sans-serif;font-size:13px">what is exactly meant with Tmin?</div><div style="font-family:arial,sans-serif;font-size:13px">Is a value of 9ºR realistic with a VAV system?</div><div style="font-family:arial,sans-serif;font-size:13px">
<br></div><div style="font-family:arial,sans-serif;font-size:13px">thanks in advance for your time, </div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">
<br></div><div style="font-family:arial,sans-serif;font-size:13px">Luca</div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><span style="font-family:arial,sans-serif;font-size:13px">-- </span><br style="font-family:arial,sans-serif;font-size:13px">
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<br></b></font></div><div style="text-align:left"><span lang="IT"><font color="#666666" face="arial, helvetica, sans-serif"><b>Luca Volpi</b></font></span><span lang="IT"><font color="#666666" face="arial, helvetica, sans-serif"><b> </b></font></span><span style="color:rgb(102,102,102);font-family:arial,helvetica,sans-serif">A</span><span style="color:rgb(102,102,102);font-family:arial,helvetica,sans-serif">rch. </span><span style="color:rgb(102,102,102);font-family:arial,helvetica,sans-serif">Dipl.-Ing.</span><span style="color:rgb(102,102,102);font-family:arial,helvetica,sans-serif"> </span><span style="color:rgb(102,102,102);font-family:arial,helvetica,sans-serif"> </span></div>
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