Hi Trnsys-Users, I would be pleased to get some detailed information and help for the type 1b. I wanna simulate a solar-supplied heating system. In addition to it I use the type 1b for a solar array. The hole solar array has to be 30 m² tall, compound by 12 panels. Out of these 12 pieces are 6 of it in a row. The rows are parallel in the hydraulic system. I fixed the system in Trnsys as followed with one type 1b: Number in series: 6 Collector area: 4.84 m² The type doesn’t provide the expected values. So I tested some small projects. I found out, that the number in series doesn’t have any impact to the useful gains. It doesn’t matter, if I put the value to 1 or to 100.There is no different. What’s wrong? On the other side I used 12 panels and connected them to an array. It worked well and the output seems to be ok. Next I only used 1 panel with 30 m². The useful gains compared with gains out of 12 panels are 10-times more. Which solution is the right one? I use Trnsys 16 and I can’t update it, because I got it just to do my exam. Many thanks in advanced for your help. Patrick |