<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:10pt"><pre>Dear TRNSYS Users,</pre><pre>I am using a water-water heat pump (Type 927) to simulate an existing installation.
I have the heating and cooling demand profiles of the building, therefore I use an equation with the formula Q=m*Cp*ΔT <span style="font-size: 10pt;">to calculate the returning temperature of the fluid (T2) in the load loop for each time step. </span></pre><pre><span style="font-size: 10pt;">Flow rate = 6.8 l/s</span><br></pre><pre>Cp = 4.18</pre><pre>dT= (Q*3600)/(Flowrate_to_Load*Cp)</pre><pre>T1 = Constant</pre><pre>T2 = T1-dT</pre><pre>Q = heating or cooling load</pre><pre>1. when calculating dT how do I differentiate between the heating and cooling data?</pre><pre>2.Should the return temperature (T1) from the heat pump be constant or is there another way of calculating the return temperature?</pre><pre><pre>For the load loop the only components I use are the heat pump, one equation and a single speed pump.</pre><pre><br></pre><pre>Thank you in advance.</pre><pre><br></pre><pre>Regards,</pre><pre>
<div class="MsoNormal">Metkel Yebiyo BEng (Hons), MSc</div><div class="MsoNormal">CEREB PhD Researcher - Ground Source Heat Pumps </div><div class="MsoNormal">Room T615 </div><div class="MsoNormal">Department of Urban Engineering </div><div class="MsoNormal">Faculty of Engineering, Science and the Built Environment</div><div class="MsoNormal">London South Bank University, </div><div class="MsoNormal">103 Borough Road,</div><div class="MsoNormal">London SE1 0AA</div><div class="MsoNormal">Tel: +44 (0)20 7815 7639</div><div class="MsoNormal">E: <a href="mailto:yebiyom@lsbu.ac.uk">yebiyom@lsbu.ac.uk</a><o:p></o:p></div>
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