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Cathy,<br>
<br>
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<div>1. I use the weather data(*.epw) downloaded from the
webe of Energyplus as the external files of Type15-2.
When running simulation of the project, there is no
warning or error. But all the weather data are not read
out and shown as zero.</div>
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At one point, the energyplus weather file format changed and so we
had to change TRNSYS to correspond. Please send me the *.epw file
that you are trying to read (as well as which version of TRNSYS you
are running) and I'll take a look at it.<br>
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<div> 2. In the water circulation, the flow rates of
Single speed pump( Type114) can be varied when the
values of the inlet fluid flow rates are different. What
are the differences between the Sigle speed
pump(Type114) and Variable speed pump(Type110)?</div>
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In TRNSYS almost all of the pump models set the downstream flow
based on the value of the rated flow rate (a parameter) and the
control signal (an input). They ignore the amount of flow that is
coming into the pump from upstream except to do a mass-balance
check. Type114 is designed to have a control signal of either 0
(off) or 1 (on). In fact if you give it a control signal of <
0.5, this is interpreted as 0 (off). If you give it a control signal
> or = 0.5, this is interpreted as 1 (on). The flowrate out of
Type114 will always be either zero or the rated flow rate.<br>
<br>
With Type110, the rated flow rate (parameter) is multiplied by the
value of the control signal input (which typically varies between 0
and 1) to give the outlet flow rate. You have to be a bit careful
with Type110 because it does not limit the input control signal to a
maximum value of 1.0. If you specify a control signal of 10, your
output flow rate will be 10 times the pump's rated flow rate. We do
not limit the control signal input to a maximum value of 1 because
there are cases in which pump are intentionally run above their
rated flow rate.<br>
<br>
Kind regards,<br>
David<br>
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<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>
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