<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Dear Zhe,<br>
In addition to Jean Marais' response, I thought that I would
mention that if you have precalculated loads, you can impose them
either on an air stream or on a water stream using components from
the TESS Loads and Structures Libraries (Type682 and 693). Jean is
quite correct that it is best to have the weather data for the same
year for which the loads were generated since the heat pump
performance depends on ambient conditions.<br>
<br>
As for the second part of your question. There are two ways of
modeling buildings and systems. The first way is that you calculate
the loads and then impose them on the HVAC equipment. When you do
this, however, you presuppose the zone temperatures. You no longer
have any control over when the heat pump turns on and when it turns
off. If there is a load (whether heating or cooling) it must be
imposed on the heat pump. All of the control algorithms are built in
to determining the space load.<br>
<br>
The other way of modeling a building is to allow the building
temperature to float, to define a thermostat model that senses the
room temperature and which is then used to command equipment to turn
on and off to keep the space at its temperature. In this case there
is no load. The conditioned air or water stream from the heat pump
is delivered to the zone by whatever means are appropriate (a
VENTILATION type in Type56, an active layer in Type56, a fan coil
model, the heat pump itself...) and the zone temperature responds
accordingly. The thermostat senses the room temperature change and
decides whether to keep the equipment on or turn it off.<br>
Kind regards,<br>
david<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/2/2012 07:00, Zhe Li wrote:<br>
</div>
<blockquote cite="mid:000b01cd584a$3b60db80$b2229280$@Li@dit.ie"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 12 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">Dear all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am having two problems. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a measured hourly domestic heat
loads for a year, I would like to implement it in TRNSYS
simulation. Which component is best for this application? And
how to actually implement it? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Also, I would like to utilise air-water
heat pump. However, I want to turn the heating mode on only,
and completely turn off the cooling mode. How could I achieve
this? <o:p></o:p></p>
<p class="MsoNormal">I would like to set room temperature at
22oC. I would want to turn on the heat pump at temperature
below 20oC and turn it off when room temperature arrives at
24oC. I notice there are a few controllers are capable to do
this, however, which one is the easiest in controlling this
function?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you very much in advance.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Zhe Li<o:p></o:p></p>
</div>
<br>
<br>
Tá an teachtaireacht seo scanta ó thaobh ábhar agus víreas ag
Seirbhís Scanta Ríomhphost de chuid Seirbhísí Faisnéise, ITBÁC
agus meastar í a bheith slán. <a moz-do-not-send="true"
href="http://www.dit.ie">http://www.dit.ie</a><br>
This message has been scanned for content and viruses by the DIT
Information Services E-Mail Scanning Service, and is believed to
be clean. <a moz-do-not-send="true" href="http://www.dit.ie">http://www.dit.ie</a>
<br>
<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>