<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
Fahri,<br>
This is a problem in actual heat pump systems, not a problem in
your simulation. I have seen two approaches. You can either store
very hot water (60C or so) in the tank and then use valves to mix
some of the water that returns from the floors with some of the hot
water that is being stored in the tank (supplied by the heat pump)
so that the actual supply temperature is lower than the stored water
temperature (maybe 28C). Or you can store water in the tank at your
distribution (supply) temperature of 28C. In this case, a thermostat
sits watching the tank temperature and turns on the heatpump when
the tank drops below the set point. Of course the heat pump still
delivers 60C water to the tank but it then turns off as soon as the
thermostat in the tank sees that the temperature has risen back
above 28C<br>
Best,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 6/27/2012 10:06, Fahri Avci wrote:<br>
</div>
<blockquote
cite="mid:trinity-be8b100a-4b8c-4da5-b76e-acdd23728ebb-1340809588295@3capp-webde-bs22.dlan.cinetic.de"
type="cite">
<div style="font-family: Verdana;font-size: 12.0px;">
<div>Hi everybody,<br>
</div>
<div><br>
</div>
<div>I'm new in Trnsys and i work on my bachelors Thesis. I have
a problem with my water-water heat pump(type 668) and my
stratified storage tank(type 4e).<br>
</div>
<div>I try to heat my building model to room temperature(20°C)
with floor heating and the heat pump. Between the two
components, i have a storage tank.<br>
</div>
<div><br>
</div>
<div>Now the problem is that my heat pump provides a high load
temperature but in fact i don't need a high temperature
because a floor heating system doesn't<br>
</div>
<div>need a high inlet temperature. Unfortunately type 668
doesn't have a parameter where i can set the outlet
temperature. The only thing i can do is to reduce the<br>
</div>
<div>parameter "boiling point" of water in my storage tank less
than 100°C to have a moderate heat pump outlet temperature
but i think it doesn't make sense because <br>
</div>
<div>the boiling point of water is about 100°C. Now i wonder how
i can control my heatpump to heat the water to the desired
temperature. I guess the high temperature is depending<br>
</div>
<div>to the boiling point of the storage, i think the heat pump
always try to reach this point of temperature.<br>
</div>
<div><br>
</div>
<div>Thank you for your helps,<br>
</div>
<div><br>
</div>
<div>Best Regards,<br>
</div>
<div><br>
</div>
<div>Fahri Avci<br>
</div>
<div><br>
</div>
<div>TUM München<br>
</div>
<div>Lehrstuhl Energiewirtschaft und Anwendungstechnik<br>
</div>
<div>Arcisstraße 21 München<br>
</div>
</div>
<br>
<br>
<table border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="font-family:verdana; font-size:12px;
line-height:17px;border-top:1px solid #000000">Ihr WEB.DE
Postfach immer dabei: die kostenlose WEB.DE Mail App für
iPhone und Android. <br>
<a moz-do-not-send="true"
href="https://produkte.web.de/freemail_mobile_startseite/"><b>https://produkte.web.de/freemail_mobile_startseite/</b></a></td>
</tr>
</tbody>
</table>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@cae.wisc.edu">TRNSYS-users@cae.wisc.edu</a>
<a class="moz-txt-link-freetext" href="https://mailman.cae.wisc.edu/listinfo/trnsys-users">https://mailman.cae.wisc.edu/listinfo/trnsys-users</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
***************************
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
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
<br>
<br>
</body>
</html>