<font size="4">Dear all,<br><br>I have some questions about Energy balance for one zone (Ntype 904).<br><br>1)
For Qtrans, it might be stored thermal energy (>0?) in the wall or
directly transmitted (<0?) through the wall. But I want to calculate
the two parts exactly, i.e. how to calculate the part of stored thermal
energy in the wall and directly transmitted energy, separatedly?<br>
<br>2) For Qsolgain, does it mean Ntype 14 +15? or only Ntype 75?<br>What relationship between Qsolgain and Solar_rad. (kWh) in T56_stdoutput.sum file? Are both the same? or included relationship?<br><br>3) For Qgint, is it Ntype 7 + 13? Is it equal to Int_gains in T56_stdoutput.sum file?<br>
<br>4) I want to calculate Heat Loss (or energy consumption) in a zone
e.g. in winter, whether or not the heat loss includes Qinf + Qvent
+DQairdt+ Qtrans (only the part of directly transmitted through the
wall, not the part of stored part, that is why I ask 1))?<br>
<br>For the actual heat gain e<font size="4">.g. </font>in winter in one zone, it only includes Qgint + Qsolgain?<br><br>However, Qheat and Qcool should be Heat loss or heat gain?<br><br>Many thanks in advance!<br>Br.<br>
<br>yang wang</font><br><br><br><br><br><div class="gmail_quote">2013/1/21 王洋 <span dir="ltr"><<a href="mailto:wanghongyang1767@gmail.com" target="_blank">wanghongyang1767@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br><div class="gmail_quote">2013/1/18 王洋 <span dir="ltr"><<a href="mailto:wanghongyang1767@gmail.com" target="_blank">wanghongyang1767@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br><br><div class="gmail_quote">2013/1/8 <span dir="ltr"><<a href="mailto:trnsys-users-request@cae.wisc.edu" target="_blank">trnsys-users-request@cae.wisc.edu</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<br>Today's Topics:<br>
<br>
1. Re: 2 independet + 1 dependent variables in look-up files<br>
(David BRADLEY)<br>
2. Re: Type94a - multi array will be wrongly calculated<br>
(David BRADLEY)<br>
3. Hybrid dessicant dehumidifier (Graham S. Wright)<br>
<br><br>---------- 已转发邮件 ----------<br>From: David BRADLEY <<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>><br>To: leen peeters <<a href="mailto:l.f.r.peeters@gmail.com" target="_blank">l.f.r.peeters@gmail.com</a>><br>
Cc: "<a href="mailto:trnsys-users@cae.wisc.edu" target="_blank">trnsys-users@cae.wisc.edu</a>" <<a href="mailto:TRNSYS-users@cae.wisc.edu" target="_blank">TRNSYS-users@cae.wisc.edu</a>>, <a href="mailto:vanreeth.b@bxl.daikineurope.com" target="_blank">vanreeth.b@bxl.daikineurope.com</a><br>
Date: Tue, 08 Jan 2013 09:10:04 -0600<br>Subject: Re: [TRNSYS-users] 2 independet + 1 dependent variables in look-up files<br>
<div text="#000000" bgcolor="#FFFFFF">
Leen,<br>
Unless I am misunderstanding what you want to do, the solution is
quite easy as long as you are able and willing to write a new Type;
TRNSYS has a built-in kernel subroutine called InterpolateData
(formerly called DynamicData) that performs exactly the function
that you are looking for. The subroutine is called from a Type with
the values of as many as 6 independent variables. The subroutine
looks through an external file, finds and returns the values of as
many as 10 dependent variables that correspond to the input values.
The subroutine interpolates linearly between values but cannot
extrapolate beyond the range of values that is given in the data
file.<br>
<br>
Before you go too far down the path of writing a new heat pump
model, I would recommend that you look through the TESS HVAC Library
documentation on existing heat pump models and also take a look at
the code of some of those models. Most of them stay away from energy
rate control (in which a precalculated load is imposed on the heat
pump) and stick with temperature level control (in which case heat
pump capacity and fraction of full load power are computed based on
inlet and ambient conditions.) Those models may be what you are
looking for or could be modified with little effort to better suit
your needs.<br>
Best,<br>
David<br>
<br>
<br>
<br>
<div>On 1/8/2013 06:35, leen peeters wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi all,</div>
<div> </div>
<div>We are trying to model more accurately a heat pump for
which the performance should ideally be read out from a text
or excel file.</div>
<div>The data depend on 3 parameters (outdoor and indoor air
temperature, requested output). </div>
<div>Part load ratios are hard to define, as the actual capacity
depends on the model type and the outdoor conditions. So it
seems logic to use excell. However, values are not a function,
but should be looked up in the excell table, potentially
interpolated, ... and to make it more challenging, the final
SPF does depend on PLR, outdoor and indoor temperature. So it
is not just using the external temperature and required
capacity to calculate PLR and consequently use that PLR plus
indoor temperature to calculate SPF.</div>
<div> </div>
<div>Calling 6 different excell files in a simulation of 8760*4
steps will take considerable time. The current standard TRNSYS
look up model allows two independent parameters defining the
output ... so insufficiently accurate.</div>
<div> </div>
<div>any suggestions on how to solve that? </div>
<div> </div>
<div>thanks,</div>
<div> </div>
<div>leen</div>
</div>
<br>
<fieldset></fieldset>
<br>
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<br>
<pre cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:<a href="tel:%2B1.608.274.2577" value="+16082742577" target="_blank">+1.608.274.2577</a>
F:<a href="tel:%2B1.608.278.1475" value="+16082781475" target="_blank">+1.608.278.1475</a>
<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>
<a href="http://www.tess-inc.com" target="_blank">http://www.tess-inc.com</a>
<a href="http://www.trnsys.com" target="_blank">http://www.trnsys.com</a></pre>
</div>
<br><br>---------- 已转发邮件 ----------<br>From: David BRADLEY <<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>><br>To: Olaf Scholz <<a href="mailto:olaf.scholz@online.de" target="_blank">olaf.scholz@online.de</a>><br>
Cc: <a href="mailto:trnsys-users@cae.wisc.edu" target="_blank">trnsys-users@cae.wisc.edu</a><br>Date: Tue, 08 Jan 2013 09:16:30 -0600<br>Subject: Re: [TRNSYS-users] Type94a - multi array will be wrongly calculated<br>
<div text="#000000" bgcolor="#FFFFFF">
Olaf,<br>
I have used multiple instances of Type94 to compute the output of
differently oriented PV arrays a number of times and have gotten
good results so I suspect that there may be a problem in the way the
model has been defined. One complexity of Type94 is that it has two
power outputs; one that gives the power at the maximum power point
(and therefore assumes that the array is equipped with a maximum
power point tracking (MPPT) device) and another that gives the array
power at a particular load voltage. This second output is used for
direct-connected systems that do not have an MPPT and in this case,
the load voltage is an input to the model. Make sure that you are
looking at the maximum power point power when you compare the output
of the three arrays; otherwise, the problem may be that the load
voltage on the array is so low that the power output of the array is
minimal no matter what its orientation. If you are unable to find
the solution then I would recommend that you send your project to
your distributor for further assistance.<br>
Best,<br>
David<br>
<br>
<br>
<div>On 1/8/2013 03:12, Olaf Scholz wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal"><span lang="EN-US">I created a PV collector
field consisting of three fields (type 94a) for 3 incident
directions (east, south, west) all 94a- modules are
connected tot o a type109 weather generator. The total
incident radiation for the three directions seems to be
calculated correctly (output of type109 for three different
surfaces). But the power output of the PV modules seems to
be always the same, which is not correct. Do you have a
solution for that ?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">It seems to be the used
input variable in type 94a is always the same, so that only
the last value is used for the calculation.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt">Olaf</span></b><span><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<br>
<fieldset></fieldset>
<br>
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</pre>
</blockquote>
<br>
<pre cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:<a href="tel:%2B1.608.274.2577" value="+16082742577" target="_blank">+1.608.274.2577</a>
F:<a href="tel:%2B1.608.278.1475" value="+16082781475" target="_blank">+1.608.278.1475</a>
<a href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a>
<a href="http://www.tess-inc.com" target="_blank">http://www.tess-inc.com</a>
<a href="http://www.trnsys.com" target="_blank">http://www.trnsys.com</a></pre>
</div>
<br><br>---------- 已转发邮件 ----------<br>From: "Graham S. Wright" <<a href="mailto:graham@wrightonsustainability.com" target="_blank">graham@wrightonsustainability.com</a>><br>To: <a href="mailto:trnsys-users@cae.wisc.edu" target="_blank">trnsys-users@cae.wisc.edu</a><br>
Cc: <br>Date: Tue, 8 Jan 2013 09:20:31 -0600<br>Subject: [TRNSYS-users] Hybrid dessicant dehumidifier<br><br>
Hello,<br>
<br>
I am wondering if some one has made a TRNSYS component for this thing, or if there is a way to model it with existing ones. The DryCool HD dessicant dehumidifier by Munters. See screenshot below from the manual.<br>
<br>
Thanks,<br>
<br>
Graham S. Wright<br>
Passive House Institute US<br>
<br>
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<br></blockquote></div><br>
</blockquote></div><br>
</blockquote></div><br>