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Brad, There is an example of using a PID to control flow through a radiant floor (SunSpace - Floor heating PID controller.tpf). You'll probably need to put a lower limit on the flow rate that your controls decide should go through the radiant floor. However, far from that being a workaound, it is a physical reality that pumps have minimum turndown ratios and the flow through the pipes in the floor must stay turbulent in order for there to be heat transfer. The requirement of maintaining turbulent flow is what causes the minimum flow rate in the first place. Lastly if you need to use a lower flow rate then you need to go into TRNBuild and autosegment the floor. What this does is to break the floor into smaller pieces that are in series with one another instead of being in parallel from a liquid flow point of view. regards, David On 10/04/2015 21:52, Bradley Painting
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-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |