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<p class="MsoNormal">Dear all,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span lang="EN-US">I’ve modeled a building heating simulation with following main elements: a heat pump (type401) connected to a stratified storage tank (type4a), and a building (type56) connected to the storage tank. The types are connected
with single speed pumps (type114) (pump efficiency and motor efficiency is set to 1, heat loss fraction 0). The heat transfer into the building is realized by active layer in type56. Actually the simulation works, but if I look in the plotted results (type65c
excel file) there are deviations in the input and output temperatures of the fluids. For example the input temperature of the active layer differs from the output of the connected single speed pump (which are directly connected). The deviations are quite low
(3 places after the decimal point for example 33.0716522857412 and 33.0703189827348). However, I’m wondering why there is a deviation because the output value should be the same as the input value?! Since I’m simulating in one minute time steps I got a significant
error in the energy balance about one percent. In the control cards I’ve have already set the “tolerance integration” and “tolerance convergence” to 0.0001. Does anyone has an advice how I can choose this problem?</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you very much in advance for an advice.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Kind regards</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Lukas Spitalny</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="">--</span><span lang="EN-US" style="font-size:5.5pt"></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="">Lukas Spitalny, M. Sc.</span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="">Research Associate</span></p>
<p class="MsoNormal"><span lang="EN-US" style=""> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="">TU Dortmund University</span></p>
<p class="MsoNormal"><span lang="EN-US" style="">Institute of Energy Systems, Energy Efficiency and Energy Economics</span></p>
<p class="MsoNormal"><span style="">Emil-Figge-Str. 68</span></p>
<p class="MsoNormal"><span style="">44227 Dortmund</span></p>
<p class="MsoNormal"><span style=""> </span></p>
<p class="MsoNormal"><span style="">Phone: +49 (0)231 / 755-4305</span></p>
<p class="MsoNormal"><span style="">Fax: +49 (0)231 / 755-4338</span></p>
<p class="MsoNormal"><span style="">Mail: <a href="mailto:lukas.spitalny@tu-dortmund.de">
<span style="color:blue">lukas.spitalny@tu-dortmund.de</span></a></span></p>
<p class="MsoNormal"><span style=""><a href="http://www.ie3.tu-dortmund.de/"><span style="color:windowtext">www.ie3.tu-dortmund.de</span></a></span></p>
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