"Quantity or condition","Fictional before addition","Fictional after addition","Your proposal","Interpretation"
"Closed fluid-circuit boundary","Same connected circuit","Same connected circuit plus buffer","","Identify which inventory belongs to the circuit"
"Fluid identity","Same hypothetical fluid","Same hypothetical fluid","","Use documented fluid properties for a real design"
"Temperature interval","Same stipulated interval","Same stipulated interval","","No numerical temperatures selected in this exercise"
"Assumed fractional volume increase (%)","1","1","","Invented arithmetic assumption; not a fluid coefficient"
"Total connected fluid volume (L)","2000","2500","","System inventory, not vessel nominal capacity"
"Additional connected buffer fluid (L)","0","500","","Example counts this added fluid in the same circuit"
"Calculated fluid increase (L)","20","25","","Fixed example arithmetic only; not required vessel size"
"Increase versus earlier expansion (%)","Reference case","25","","(25-20)/20 x100; no design acceptance result"
"Nominal expansion-vessel volume","Not selected","Not selected","","Requires separate qualified vessel selection"
"Working acceptance under design conditions","Not established","Not established","","Do not replace with generic maximum acceptance"
"Vessel design/acceptance evidence","","","","Retain qualified pressure/temperature basis; no settings selected here"
"Meaning of quoted litre figure","","","","System inventory, fluid expansion, nominal vessel or acceptance?"
"Unresolved question for heating designer","","","","Heat-exchanger-separated fluid is a separate boundary; shared-fluid hydraulic separation is not"
"Use","Manual worksheet; no formulas. Import UTF-8 comma-separated; widen and wrap text. Save editable spreadsheet copy.","Example columns are fixed fictional arithmetic; do not use 1% for project design.","Enter proposal evidence only in the blank Your proposal column.","No vessel sizing, pressure settings, live-system work or heat-storage calculator"
"Source context","https://www.caleffi.com/sites/default/files/media/external-file/01079_EN.pdf","https://farm-energy.extension.org/root-zone-heating-systems-for-greenhouses/","https://www.caleffi.com/en-us/blog/2-basic-concepts-detailing",""