UK Insolation: Heat Gain Through Windows & NSE&W Calcs

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The discussion focuses on calculating heat gain through windows in the UK, specifically for vertical surfaces facing north, south, east, and west. The user has encountered significant discrepancies among data from a glass manufacturer, a net-based calculator, and the BRE standard assessment procedure. They express a preference for the net-based calculator but seek additional reliable standards or models for accurate heat gain figures. The conversation highlights the need for consistent and dependable data in energy rating assessments for houses. Reliable sources for heat gain calculations remain a key concern for the user.
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I am doing a few calcs regarding heat gain through windows and I am looking fot some typical values to apply for vertical surface NSE&W.
I currently have figures from a glass manufacturer, a net based calculator and the BRE standar assesment proceedure ( for energy rating houses).
All three are wildly different with the net based one looking most likely , but does anyone know of any standards or models that can provide a reliable figure I can use.
many thanks in advance
Kev
 
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I am leaning further to the net based calculator now.
But does anyone have any knowledge of gain figures or any idea where to find them

Kev
 
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