w/m2 to Btuh/ft2

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w/m2 to Btuh/ft2

Postby epsobolik » Wed Aug 13, 2008 9:44 pm

Anyone know how to convert Watts/m2 to Btuh/ft2?

Re: w/m2 to Btuh/ft2

Postby Guest » Wed Aug 13, 2008 9:56 pm

epsobolik wrote:Anyone know how to convert Watts/m2 to Btuh/ft2?

Which BTU. There are (at least) five definitions, differing in subtle differences of the starting and stopping water temp.

Per NIST SP 811, divide by 3.154591 for Steam Table BTU or 3.152481 for thermochemical BTU.

Watts/m2 to Btuh/ft2

Postby epsobolik » Wed Aug 13, 2008 10:29 pm

Yikes! This is for solar hot water heaters/air conditioners. Either is accurate enough. Thanks.

Watts/m2 to Btuh/ft2

Postby epsobolik » Thu Aug 14, 2008 7:15 pm

Actually its either Wh/m2 to Btuh/ft2 or Watts/m2 to Btu/ft2

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