We have investigated the operating characteristics of 1,600 m2 large-scale solar thermal system
installed in an eco-friendly energy town in Chungbuk Innovation City. The operation criteria of
the collecting pump and storage pump were different from the existing standard, and it was
confirmed that each pump works well according to the changed criteria. Based on the data of the
representative day, the daily collecting heat (efficiency) and the production (storing) heat (efficiency)
were estimated. It was confirmed that the daily collecting heat (efficiency) of the flat plate type
was higher than that of the evacuated tube type, but the useful heat production was more in
evacuated tube type collector.