<html>
<body>
Dear Jiang Shuang<br><br>
<blockquote type=cite class=cite cite="">
<font face="Times New Roman, Times">(1)I use type515 and type14 combined
with an equation to control the water-to-water heat pump. When the
heating signal is 1, it works under heating mode, and when the cooling
signal is 1, it works under cooling mode. However, I find that when both
heating signal and cooling signal change to 0, the heat pump stop
working, but it still has a power output! I have used the control part to
a water-source heat pump, and all components work well.
</font></blockquote><br>
unless I am mistaken, this was a bug in the initial release of the TESS
Libraries 2.0.00. It was fixed in the release of 2.0.01. You should
contact your distributor to get the latest version of the appropriate
DLL.<br><br>
<blockquote type=cite class=cite cite="">
<font face="Times New Roman, Times">(2)I find the example about type668
given in trnsys is about hot water producing and more examples in the
internet are also about heating. But in my country, it is common that
ground source heat pump is used to produce chilled water and hot water to
air conditioners in a building, in which they exchange heat with the
outdoor air. Then the airs are distributed to rooms. My question is that
if type668 can be used for the above purpose. If not, which type should I
choose? </font></blockquote><br>
yes, certainly. Type668 simply models a water to water heat pump.
The control signals can be set up to take energy from the ground and use
it to heat load side water (heating mode) or to reject energy to the
ground and cool load side water (cooling mode). <br><br>
<blockquote type=cite class=cite cite="">
<font face="Times New Roman, Times">(3) The vertical u-tubes (type557)
has a parameter: number of boreholes in series, what does it mean? If
there are many series parallel loops (It is common in practice), what
should I do?</font></blockquote><br>
Type557 parameter 4 asks you to specify the total number of boreholes in
the entire storage volume of earth. Parameter 6 asks you to specify the
number of boreholes in series per parallel loop. Based on these two
values, Type557 internally calculated how many parallel loops there are
in your field.<br><br>
Kind regards,<br>
David<br><br>
<x-sigsep><p></x-sigsep>
****************************************************************************************<br>
Thermal Energy System Specialists (TESS), LLC <br>
David
BRADLEY
2916 Marketplace Drive - Suite 104 <br>
Partner
Madison, WI 53719 <br>
Phone: (608) 274-2577 USA <br>
Fax: (608) 278-1475 <br>
E-mail: bradley@tess-inc.com <br>
Web Pages:
<a href="http://www.tess-inc.com/" eudora="autourl">
http://www.tess-inc.com</a>
and
<a href="http://www.trnsys.com/" eudora="autourl">
http://www.trnsys.com<br><br>
</a>"Providing software solutions for today's energy engineering
projects" <br>
****************************************************************************************<br>
</body>
</html>