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  • Users: mechWatt
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  1. mechWatt

    Noise calculations

    Is there any equation or recommendation that I could use in order to see if my plenum box (with grill attached) will produce noise? Grills supply air to a public area and therefore, I would like to eliminate as much noise as possible. Air speed thru the grill is around 1,2 m/s.
  2. mechWatt

    Dew point for wall structure

    Regards to all of you. I have a small problem that I can't really solve fully at the moment. I am trying to determine whether there will be a condensation in/on an insulated concrete wall. I've managed to determine the heat transfer rate thru the wall and temperature between each layer. Now...
  3. mechWatt

    Parallel work of fans vs. pumps

    So, I have a quick question and would be grateful if someone could explain me the difference. When you have 2 centrifugal pumps working in parallel (with same head and flow), resulting operating flow is not two times the flow of a single pumps, but somewhere in between (with head staying the...
  4. mechWatt

    Spiral and rectangular ducts worksheet

    As title suggests, could anyone help me with providing literature for spiral and rectangular sheet metal ducts work sheets? Basically, I need drawings for parts of the ducts (Tees, rectangular to round section, crosses etc.), in their 'laid out' form, before the bending etc., so I can send them...

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