Crappy temperature conversion

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Crappy temperature conversion

Postby Guest » Fri Jun 25, 2004 8:33 am

How do I convert [Btu/hr.ft^2.F]^-1 to [m^2.K/W]^-1?

Thermal Conductivity

Postby Guest » Fri Jun 25, 2004 9:34 pm

Given that both your units are raised to the power of -1, this is the same as inverting both (i.e. reciprocal).
This would make the metric one W/m²°K. This has Watts (unit of power or rate of energy flow) on the top, whereas the imperial one would have Btu/hr (also rate of energy flow) on the bottom. So I think you have one too many ^-1 in there.
These look like units connected to thermal conductivity to me so I would assume that what you are probably after is Btu/hr.ft².°F to [m².°K/W]^-1. If the ^-1 is truly applied to the imperial unit rather than the metric then divide by the factor below rather than multiply.
As mentioned above [m².°K/W]^-1 is the same as W/m²°K, so to convert Btu/hr to Watts multiply by 0.2931. Because the ft², m², °F and °K are at the bottom you divide by 0.3048² and 0.5556 respectively. Putting this lot together gives you:
0.2931/(0.3048² x 0.5556) = 5.6784

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