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Crappy temperature conversion
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Dear convert-me.com forum visitors,
Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.
All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page
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2 posts
• Page 1 of 1
Crappy temperature conversion
by Guest » Fri Jun 25, 2004 8:33 am
How do I convert [Btu/hr.ft^2.F]^-1 to [m^2.K/W]^-1?
- Guest
Thermal Conductivity
by 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
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
- Guest
More info
2 posts
• Page 1 of 1