Hi Inga I had similar problem with a solar collector and a new component that I developed for myself. The values of userful energy gain was too high in comparation with my calculations and with the values of a real solar collector that I have in operate. Well basicly, my problems were in the units of output of userful energy gain in solar collector and the units of input of my component. The unit of userful energy gain are (kj/hr) and this causes that the values be too high. I recomend to you add a unit conversion routine (type57) between the solar collector and the heat exchanger to convert the unit to (kj/s). For this, you have that change the parameter inside of type 57 according to table of trnsys 17 manual (chapter 4, page 4.426-4.431). Well, there was my fix. I would wish which work for you Best regards Oswaldo Hidalgo B Enviado desde D.M
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