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<DIV><SPAN class=403453208-18092007><FONT face=Arial>Dear
Stergiou,</FONT></SPAN></DIV>
<DIV><SPAN class=403453208-18092007><FONT face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=403453208-18092007><FONT face=Arial>here is a short abstract
from the manual how T_COOL_ON is defined and why:</FONT></SPAN></DIV>
<DIV><SPAN class=403453208-18092007><FONT size=3><FONT face=Arial><FONT
color=#0000ff><FONT size=2>"</FONT></FONT></FONT></FONT></SPAN></DIV>
<DIV><SPAN class=403453208-18092007><FONT size=3><FONT face=Arial><FONT
color=#0000ff>For the definition of the set temperature of the room air there
are four options:</FONT></FONT></DIV>
<UL>
<LI><FONT face=Arial color=#0000ff>A constant set temperature of the
air</FONT></LI></UL>
<UL>
<LI><FONT face=Arial color=#0000ff>According to DIN 1946 a <B>floating</B> set
temperature based on ambient temperature, upper limit<BR></FONT></LI></UL></LI>
<UL>
<LI><FONT face=Arial color=#0000ff>According to DIN 1946 a <B>floating</B> set
temperature based on ambient temperature (lower limit)<BR></FONT></LI></UL></LI>
<UL>
<LI><FONT face=Arial color=#0000ff>A user defined time-depended set value
(time schedule)</FONT></LI></UL>
<DIV><FONT face=Arial><FONT color=#0000ff><B>Note: </B>DIN 1946 refers to
operative temperature which is not identical to the room air temperature.
TRNSYS<I>lite</I> enables an control strategy based on room air temperature. In
most cases in summer the air temperature is higher than the operative
temperature because of the radiative temperature of inside surfaces of the room
which has to be considered.</FONT></FONT></DIV>
<DIV><SPAN class=403453208-18092007><FONT face=Arial
color=#0000ff>"</FONT></SPAN></DIV>
<DIV><SPAN class=403453208-18092007><FONT face=Arial size=2>For your problem
with the schedule you should define a dead band of at least 1 K for heating and
cooling, this could probably help you.</FONT></SPAN></DIV>
<DIV><SPAN class=403453208-18092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=403453208-18092007><FONT face=Arial size=2>With kind
regards</FONT></SPAN></DIV>
<DIV><SPAN class=403453208-18092007><FONT face=Arial size=2>Christian
Frenzel</FONT></SPAN></DIV></FONT></SPAN>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=de dir=ltr align=left><FONT
face=Tahoma>-----Ursprüngliche Nachricht-----<BR><B>Von:</B> Christos Stergiou
[mailto:chris_s1285@hotmail.com] <BR><B>Gesendet:</B> Montag, 17. September
2007 12:41<BR><B>An:</B> Trnsys e-mail list<BR><B>Betreff:</B> [TRNSYS-users]
Setting cool-on<BR><BR></FONT></DIV>Hallo,<BR>I would like to have some
information about the equation given by the wizard in order to set
the cooling system on depending on the ambient temperature. The equation given
is: T_COOL_ON = MAX(MIN(27,(Input1/3+49/3)),25), where input1 is the
ambient temperature.<BR>My question is what (Tamb+49)/3 represents and where
this value is based on.<BR>I am trying to simulate an office building and
i don't want the cooling system working during the night and during the
weekends. Can you suggest me any way to achieve that?<BR>
<P align=right>Thanks in advance,</P>
<P align=right>Stergiou Christos</P><BR>
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