Hi,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:total radiation on tilted surface: 1,93 MWh/m²/yearuseful energy gain by collectors: 1,23 MWh/m²/yearSo, 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.In the first one TYPE1a the connections with weather data are the following:Ambient temperature-->Ambient temperatureTotal radiation on tilted surface-->Incident radiationIn type 1b the connection are the following:Ambient temperature-->Ambient temperatureTotal radiation on horizontal --> Total horizontal radiationSky difuse radiation on horizontal --> Horizontal diffuse radiationGround reflected diffuse radiation on horizontal --> Ground reflectanceTotal radiation on tilted surface --> Incident radiationAngle of incidence for tilted surface --> Incident AngleSlope of tilted surface --> Collector slopeI really need to solve this problem, thanks.Jordi
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