Correct Height Difference Calculation #49
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Height difference should be calculated as the "difference between the midpoint of the lower opening and the neutral pressure level". For a typical door or casement type window, assuming neutral pressure level as one half the door/window height, this renders the height difference as 1/4 the total door/window height. Reference ASHRAE Handbook of Fundamentals chapter 16 equation 46.
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Height difference should be calculated as the "difference between the midpoint of the lower opening and the neutral pressure level". For a typical door or casement type window, assuming neutral pressure level as one half the door/window height, this renders the height difference as 1/4 the total door/window height. Reference ASHRAE Handbook of Fundamentals chapter 16 equation 46.