<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:12.727272033691406px">Dear all,</span><div style="font-family:arial,sans-serif;font-size:12.727272033691406px"><br></div><div style="font-family:arial,sans-serif;font-size:12.727272033691406px">
we need to simulate a 'energy roof', i.e. a solar boiler that is like a floor heating system.</div><div style="font-family:arial,sans-serif;font-size:12.727272033691406px">The challenge is that the flow rates are small, i.e. some 15 kg/hr for a 10m2 piece of roof. And thus the standard approach of using the active layer model does not provide what we need.</div>
<div style="font-family:arial,sans-serif;font-size:12.727272033691406px"><br></div><div style="font-family:arial,sans-serif;font-size:12.727272033691406px">So, the question is whether there is a way to get around?</div><div style="font-family:arial,sans-serif;font-size:12.727272033691406px">
Or can we apply dimensional analysis assuming the active layer acts as a single volume? In that case:</div><div style="font-family:arial,sans-serif;font-size:12.727272033691406px"><ul><li style="margin-left:15px">energy in: Q solar</li>
<li style="margin-left:15px">energy out: mc(Tout-Tin) via conductive heat transfer from concrete to water</li><li style="margin-left:15px">energy content: C(deltaT/delta t)</li></ul><div>Does that mean we can estimate the results with a flowrate m1=m/10 using the appraoch of adapting as follows:</div>
</div><div style="font-family:arial,sans-serif;font-size:12.727272033691406px"><ul><li style="margin-left:15px">Qsolar*10</li><li style="margin-left:15px">energy content: c*10</li><li style="margin-left:15px">energy out: apply conductivity lambda * 10 and use m instead of m'</li>
</ul><div>and that this would give us an estimate of m' -results?</div><div><br></div><div>thanks already,</div><div><br></div><div>leen</div></div></div>