Can anyone help me convert British Thermal Units per hour foot farhenheit, Btu/hr.ft.F, to Watts per metre Kelvin, W/m.K.

Regards

Willmot

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Can anyone help me convert British Thermal Units per hour foot farhenheit, Btu/hr.ft.F, to Watts per metre Kelvin, W/m.K.

Regards

Willmot

Regards

Willmot

- Willmot

On a quick pass, you can convert convert BTU/hr to Watts by multiplying by 0.2931. You can convert feet to meters by multiplying by 0.3048.Willmot wrote:Can anyone help me convert British Thermal Units per hour foot farhenheit, Btu/hr.ft.F, to Watts per metre Kelvin, W/m.K.

Regards

Willmot

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`BTU | 0.2931 W | 0.3048 Ft |`

---------------------------------

HrÂ·FtÂ·Â°f | BTU/Hr | m |

Getting Â°f to Kelvins, you'd first convert Â°f to Â°c using Â°c = (Â°f-32)Â·0.5556, then adding 273.1

So, you'd have:

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`W`

--------------------------

mÂ·[(0.5556Â·(Â°f-32))+273.1]

which will leave you with:

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`W`

----

mÂ·K

- Knight
- Expert
**Posts:**309**Joined:**Tue Jan 13, 2004 9:43 pm**Location:**Los Alamos, NM

These are units of thermal conductivity. The rate of heat flow (BTU/h or watts) divided by the thickness of the substance (ft or m) divided by the temperature gradient (degrees f or K). As it is a temperature gradient the correct SI unit is not K but degrees K, therefore you do not add 273.1, neither do you subtract 32 from degrees f for the same reason

According to my reference book you just multiply by 1.731 to do the conversion, which is much simpler. It comes from 1.8(degrees f to K) x 0.2931(BTU/h to Watts)/0.3048(ft to m).

According to my reference book you just multiply by 1.731 to do the conversion, which is much simpler. It comes from 1.8(degrees f to K) x 0.2931(BTU/h to Watts)/0.3048(ft to m).

- mike.wright2@networkrail.

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