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In the Hysopt library there are different BTES Base Circuits available.
If the BTES system uses a header, we call it a https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089371594/BTES+1.0 (open system)
If the BTES system uses a heat exchanger, it is called a https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089371950/BTES+1.4 (closed system)