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  • for Btu/in/sq ft/hr/oF

    Dear All:

    I just got some data with English unit, and try to convert to metric unit. it is Btu/in/sq ft/hr/oF?

    How can we do it?

    Thank you very much.

    David

  • #2
    Re: for Btu/in/sq ft/hr/oF

    Originally posted by pnl12345
    Dear All:

    I just got some data with English unit, and try to convert to metric unit. it is Btu/in/sq ft/hr/oF?

    How can we do it?

    Thank you very much.

    David
    I believe the inch should be in the numerator, BTUin/(hftF) is how NIST expresses it in NIST SP 811.

    To convert to W/(mK), multiply by 0.1442279 if using the "IT" BTU, by 0.1441314 if using the "th" BTU.

    (the BTU has the same problem as the calorie of having six or more subtly different definitions depending on the intial and final water temperature. If you wish to use the mean, 39 F, 59 F, or 60 F BTU, you will have to convert the units piecemeal. SP811 gives conversions for those to joules, but not the composite conversion. But only the International Table and thermochemical BTU are commonly used.)

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