<div dir="ltr">Hi,<div><br></div><div>I am working in a solar district heating simulation project and I am getting a solar collecotr efficiency over 64%, which is impossible. I am refering to the ratio between incident radiation to the collectors, and the energy gain by them:</div><div><br></div><div>total radiation on tilted surface: 1,93 MWh/m²/year </div><div>useful energy gain by collectors: 1,23 MWh/m²/year </div><div><br></div><div>So, I connected something erroneously, but I can not find the right way. I tried Quadratic Collector type1a and type1b and I got the same excessive efficiency.</div><div><br></div><div>In the first one TYPE1a the connections with weather data are the following:</div><div><br></div><div> Ambient temperature-->Ambient temperature</div><div> Total radiation on tilted surface-->Incident radiation</div><div><br></div><div><br></div><div><br></div><div>In type 1b the connection are the following:</div><div><br></div><div><div> Ambient temperature-->Ambient temperature</div></div><div> Total radiation on horizontal --> Total horizontal radiation</div><div> Sky difuse radiation on horizontal --> Horizontal diffuse radiation</div><div> Ground reflected diffuse radiation on horizontal --> Ground reflectance</div><div> Total radiation on tilted surface --> Incident radiation</div><div> Angle of incidence for tilted surface --> Incident Angle</div><div> Slope of tilted surface --> Collector slope</div><div> </div><div><br></div><div>I really need to solve this problem, thanks.</div><div>Jordi</div><div><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>---<br>Jordi Jové Manonelles<br></div><i><a href="mailto:jovejm@gmail.com" target="_blank">jovejm@gmail.com</a></i><br></div></div></div>
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