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How not to size radiators

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HeatingHelp
HeatingHelp Administrator Posts: 651
edited April 2022 in THE MAIN WALL
imageHow not to size radiators

There is a power in the way we are taught to do things when we are young that is unbelievably strong. That power can reach across the generations, and scramble our brains.

Read the full story here

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  • Hvactech777
    Hvactech777 Member Posts: 1
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    What’s the difference of sizing floor heating and cast iron radiator. We obviously size cast iron to meet with room heat lost correct?But floor heating we only heat to floor to 85 and that is comfort for us. Are cast iron radiators also convective heaters. How much convection how much radiation?
  • Jamie Hall
    Jamie Hall Member Posts: 23,567
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    You really have to size both to the heat loss. A cast iron radiator does put out a fair amount of radiation -- but in fact much of the heat comes from convection. In a very real sense, a good bit of the heat from a "radiant" floor is convection as well...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • GGross
    GGross Member Posts: 1,076
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    What’s the difference of sizing floor heating and cast iron radiator. We obviously size cast iron to meet with room heat lost correct?But floor heating we only heat to floor to 85 and that is comfort for us. Are cast iron radiators also convective heaters. How much convection how much radiation?

    @Hvactech777
    You still "size" the floor heating to the heat loss of the space, ideally anyway. In the case of floor heating your "size" is essentially the supply water temperature. And yes there are times when a properly functioning in floor heat system does not meet the load of a space and we must use a supplemental heat.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,157
    edited April 2022
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    It’s just that with the Paint Method, they needed really big testing laboratories.

    They could use smaller laboratories if the ceilings were lower and they used short floor painters.
    You could put twice as many floors in the same hight building.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    GGrossErin Holohan Haskell