<div>I have tried on many occasions to get a loop to loop heat pump to work, with no success. If you really want to model a loop to loop heat pump, you may have to use Energy Plus.<br></div><div><br></div><div>--</div><div>
Karen</div><br><div class="gmail_quote">On Wed, Dec 21, 2011 at 11:40 AM, Brian Fountain <span dir="ltr"><<a href="mailto:bfountain@greensim.com">bfountain@greensim.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
Without looking at the model, it would seem that eQUEST cannot size
the heating loop. The default for loop sizing is "secondary" where
eQUEST simply adds up the capacity of the coils attached to the loop
(not good I know -- apparently that is in the works in an upcoming
version). The error message suggests there is no heating elements
to count up.<br>
<br>
The issue I have had with loop-to-loop heat pumps is and imbalance
between the loads/temperatures. On the 4th tab/screen of the
loop-to-loop chiller type there are 4 temperatures (OK 2 temps and 2
delta T's) that are key to getting this system to work. When I set
those to the values in the help file, my model ran. I am no expert
on this system type but did get "reasonable" (or at least so I
thought) values in the 1 building I did create that used it.<br>
<br>
If you send your .inp and .pd2 I may be able to have a quick look.<br>
<br>
Brian<br>
<br>
On 12/21/2011 5:22 AM, Chen, Ke-Huang wrote:
<blockquote type="cite">
<div><font face="Arial"><span>Dear
eQUEST users,</span></font></div>
<div> </div>
<div><font face="Arial"><span>I
am modeling a loop to loop heat pump in the eQUEST and
it needs to attach hot water loop&pump, chilled water
loop&pump, condenser water loop&pump. After I create
these loops and pumps, there is an error in simulation shows
"Hot water loop has zero design flow. Check input for
consistency, or specify design loads.". But I did connect
heat pump to hot water loop. Is there anything I need to
input so that the simulation will be successful? Does anyone
have the experience of modeling a loop to loop heat pump?
It's my first time model heat pump, any help and suggestion
will be appreciated.</span></font></div>
<div> </div>
<div><font face="Arial"><span>Best
regards,</span></font></div>
<div> </div>
<div> </div>
<div align="left"><font face="Arial"><b>KeHuang Chen</b></font></div>
<div><b><font face="Arial">System Engineer</font></b></div>
<div><b><font face="Arial">IC BT Division</font></b></div>
<div><b><font face="Arial">Siemens Limited Taiwan</font></b></div>
<div> </div>
<div><b><font face="Arial">Tel : <a href="tel:%28%2B886%292-2652-8888" value="+886226528888" target="_blank">(+886)2-2652-8888</a>
ext. 896</font></b></div>
<div><b><font face="Arial">Mobile : <a href="tel:%28%2B886%29960548011" value="+886960548011" target="_blank">(+886)960548011</a></font></b></div>
<div><b><font face="Arial">Fax : <a href="tel:%28%2B886%292-2652-8824" value="+886226528824" target="_blank">(+886)2-2652-8824</a></font></b></div>
<div> </div>
<br>
<br>
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