Cathy,At one point, the energyplus weather file format changed and so we had to change TRNSYS to correspond. Please send me the *.epw file that you are trying to read (as well as which version of TRNSYS you are running) and I'll take a look at it. In TRNSYS almost all of the pump models set the downstream flow based on the value of the rated flow rate (a parameter) and the control signal (an input). They ignore the amount of flow that is coming into the pump from upstream except to do a mass-balance check. Type114 is designed to have a control signal of either 0 (off) or 1 (on). In fact if you give it a control signal of < 0.5, this is interpreted as 0 (off). If you give it a control signal > or = 0.5, this is interpreted as 1 (on). The flowrate out of Type114 will always be either zero or the rated flow rate. With Type110, the rated flow rate (parameter) is multiplied by the value of the control signal input (which typically varies between 0 and 1) to give the outlet flow rate. You have to be a bit careful with Type110 because it does not limit the input control signal to a maximum value of 1.0. If you specify a control signal of 10, your output flow rate will be 10 times the pump's rated flow rate. We do not limit the control signal input to a maximum value of 1 because there are cases in which pump are intentionally run above their rated flow rate. Kind regards, David -- *************************** 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 |