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Lowering SWT in existing hydronic systems

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hot_rod
hot_rod Member Posts: 22,158
in THE MAIN WALL
By popular demand our next Idronics 25 due out this summer, will go over the formulas for all sorts of heat emitters and how to derate output when running lower SWT. How to maximize condensing operation, heat pumps, solar, any low temperature heat source, ODR maximizing. Also how to use BIN data for determining hours of temperature occurrence. A sneak preview.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
IronmanSolid_Fuel_ManTinman

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  • Zman
    Zman Member Posts: 7,569
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    Great subject. How far you can lower the temps to fan coils in ducted systems without the occupants noticing he chill would be interesting.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • hot_rod
    hot_rod Member Posts: 22,158
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    Zman said:

    Great subject. How far you can lower the temps to fan coils in ducted systems without the occupants noticing he chill would be interesting.


    Properly a lot would depend on ducting runs and temperature around the duct. We could predict leaving air temperature at the coil, many coil output charts have that data.

    If you know the system will run low SWT, you could spec a coil with more rows.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Zman
    Zman Member Posts: 7,569
    edited March 2019
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    The trick is to size the coils and heat exchangers correctly. I worked in a brand new building with a 12 million BTU plant. The code required high efficiency boilers so that is what was specked. The engineer designed the fan coils and pool heat exchangers for 180 degree water. I'll be sure to send him the Idronics when it comes out. o:)
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein

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