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I am currently using openstudio 1.14, trying to set up some HVAC details based on the documentation for my project. In my building, spaces are heated from a boiler plant in the basement, and heat is distributed through a 'primary' loop that serves the main VAV coil & zone reheat coils; while a secondary hot water loop serves a system of perimeter fin radiators & unit heaters. The secondary system pumps hot water from the primary loop. According to forum responses regarding similar attempts at primary/secondary cooling systems, this pumped-secondary-loop setup is discouraged: https://unmethours.com/question/2734/modeling-primary-secondary-chilled-water-pumps-in-openstudio/ So does the OS interface in fact not support a pump-connected secondary loop setup for hot water, and should I stick to using the HX object to 'connect' the two loops (that's what I have now)? Or is there some way that I can connect the primary/secondary loops with a pump instead of the current fluid/fluid HX?

I am currently using openstudio 1.14, trying to set up some HVAC details based on the documentation for my project. In my building, spaces are heated from a boiler plant in the basement, and heat is distributed through a 'primary' loop that serves the main VAV coil & zone reheat coils; while a secondary hot water loop serves a system of perimeter fin radiators & unit heaters. The secondary system pumps hot water from the primary loop. According to forum responses regarding similar attempts at primary/secondary cooling systems, this pumped-secondary-loop setup is discouraged: discouraged (here).