INTELLIGENT WORK FORUMS FOR ENGINEERING PROFESSIONALS Log In Come Join Us! Are you an Engineering professional? Join Eng-Tips Forums! Talk With Other Members Be Notified Of Responses To Your Posts Keyword Search One-Click Access To Your Favorite Forums Automated Signatures On Your Posts Best Of All, It's Free! *Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here Door Opening Force Calculation - Staircase Pressurization Door Opening Force Calculation - Staircase Pressurization (OP) 6 Jul 17 11:03 Hi All, I'm unable to figure out a "PARAMETER" in Door Opening force Calculation. I have the formula from ASHRAE and I can substitute values to find the answer. No problem in it. But there comes a parameter that I could NOT relate where it exactly appears on doors. The measurement "DISTANCE FROM DOOR KNOB TO KNOB SIDE OF THE DOOR" is the one.
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Start networking and exchanging professional insights Register now or log in to join your professional community. 4 Answers It depends on the volume of staircase and area of leakage or normally its in cfm/m3 or you can use the following equation Q = 0. 827 A (ΔP)1/2 Q = Air Flow rate (m3/s). A = Flow area / leakage area (m2). ΔP = Pressure difference (Pa). normally50 Pa is used. static can be calculated by adding all friction losses in the duct if applicable + the air outlet which has been taken into the consideration + the pressure which is needed to be maintained + if any dampers or specific filters are taken into the system Hope this will work In addition to what M. Arsalan has mentinoned which is the situation where all the doors of stairwell are closed, you have to consider the following: 1. Air flow through internally open doors (Doors which are opened inside the building). 2. Air flow through externally open doors (Doors which are opened to outside). For how to calculate the above2 You have to see ASHRAE Applications Fire and smoke management.