<html dir="ltr"><head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style id="owaTempEditStyle"></style><style title="owaParaStyle"><!--P {
MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px
}
--></style>
</head>
<body ocsi="x">
<div style="FONT-FAMILY: Tahoma; DIRECTION: ltr; COLOR: #000000; FONT-SIZE: 13px">
<div dir="ltr">Hello everybody,</div>
<div dir="ltr"><font size="2" face="tahoma"></font> </div>
<div dir="ltr"><font size="2" face="tahoma">I am new at trnsys-users.</font></div>
<div dir="ltr"><font size="2" face="tahoma">Currently I`m modeling an already existing solar heating system (for hot water).</font></div>
<div dir="ltr"><font size="2" face="tahoma">In this system the loading pump is activated by a time delay of 4 minutes (after solar pump is launched).</font></div>
<div dir="ltr"><font size="2" face="tahoma">I tried to model this as follows:</font></div>
<div dir="ltr"><font size="2" face="tahoma"></font> </div>
<div dir="ltr"><font size="2" face="tahoma">- simulation time step: 2 minutes</font></div>
<div dir="ltr"><font size="2" face="tahoma">- storage of the control signal of the solar pump over the last two time steps by means of type 93 (input value recall)</font></div>
<div dir="ltr"><font size="2" face="tahoma">- if the control signal of the solar pump is "1" in the stored two time steps, then the loading pump is launched.</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font size="2" face="tahoma">It works (tried by a simple example deck) but does it also works</font> in context with a quite big deck (120 mē apertur area, 2 continuous controllers)?</div>
<div dir="ltr"><font size="2" face="tahoma">I`m concerned about that the small time step of 2 minutes could cause problems (for example oscillations of the controllers).</font></div>
<div dir="ltr"><font size="2" face="tahoma">Could this work or have someone of you another idea how i can solve this problem?</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font size="2" face="tahoma">Thanks a lot.</font></div>
<div dir="ltr"><font size="2" face="tahoma">Best regards.</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font size="2" face="tahoma">Stefan Wachter</font> </div>
<div dir="ltr"><font size="2" face="tahoma"></font> </div>
<div dir="ltr"> </div>
<div dir="ltr"> </div>
</div>
</body>
</html>