<HTML dir=ltr><HEAD><TITLE>[TRNSYS-users] Biomass boiler, type 700</TITLE>
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<DIV dir=ltr>Dear all,</DIV></DIV>
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<DIV dir=ltr>I have some general problems with a type 56 simulation, two related to the calculation of the ideal heating demand and 1 general question.</DIV>
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<DIV>When calculating the ideal heating edmand, <SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><SPAN><SPAN style="FONT: 7pt 'Times New Roman'"> <FONT size=2><FONT face=Tahoma><U>it takes two timesteps for the ideal heating to reach the required temperature setpoint</U>.. <BR>Is this normal or what am I doing wrong?</FONT></FONT></SPAN></SPAN></SPAN></DIV></LI>
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<DIV><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><SPAN><SPAN style="FONT: 7pt 'Times New Roman'"><FONT size=2><FONT face=Tahoma>When using a schedule in trnbuild, s</FONT></FONT></SPAN></SPAN></SPAN><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">omehow <U>the heating only switches on at exactly the time of the switch</U> (in my case 7 h and 17 h), while I assumed the schedule to mean that at the new time the new temperature must be obtained (see attached document). The heating switches OFF at exactly the changing time, so it then takes the new setpoint temperature. (see figure 2).</SPAN></DIV></LI>
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<DIV><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">General question: <SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Does anyone know why the temperature seems to be fluctuating a little (in other words: it is not a smooth line) as soon as the heating turns off?<BR></SPAN><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Also when using a smaller timestep the line is not smooth, but the temperatures stay constant during a hour, so the line looks like a staircase.. <BR></SPAN><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">(note: the non-smooth line occurs when the heating is OFF)<BR>(p.s. for some rooms the lines are more smooth than for others. I have tried different tolerances etc, but didn;t find a soluation)<BR></SPAN></SPAN><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></SPAN></DIV></LI></OL>
<P><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">All is explained in more detail with figures in the attached file. Has anyone experienced the same or has an idea what I might be doing wrong?</SPAN></SPAN></P>
<P><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Thank you very much,</SPAN></SPAN></P>
<P><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><SPAN lang=EN-GB style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Sabine Jansen</P>
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