Calculating Flue Gas Losses, Shell Boiler

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The discussion centers on the acceptance testing of a newly installed gas-fired shell boiler, specifically referencing the British Standard "BS EN 12953-11:2003". The user identifies a critical issue with equation (8.5-2) on page 16, where a value of enthalpy is incorrectly subtracted from itself, resulting in zero. This raises concerns about the accuracy of the standard, which has not been revised in a decade and is suspected to contain multiple typographical errors. The user has reached out to the British Standard organization for clarification, but a response is pending due to committee review.

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eddiej90
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I am currently performing an acceptance test for a newly installed gas fired shell boiler. I am following the British Standard "BS EN 12953-11:2003".

I have encountered a problem with equation (8.5-2) found on page 16 of the document described above. This problem being that a value of enthalpy is subtracted from itself, thus equating it to zero. Surely if this was correct then a value of zero would simply suffice within that section of the equation. The value i decribe is highlighted in the two images attached.

I have contacted the British Standard however it needs to run through a committee before they can produce an answer. Part of me does doubt my thoughts as it published ten years ago and a revised copy has not yet been published. Thought i'd best check with you guys though.
 

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It's probably some kind of typo.
 
I've found that this document has many typos. You'd think a british standard that was published ten years ago and has been confirmed wouldn't contain silly little errors like that.
 

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