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  1. mechWatt

    Noise calculations

    Sorry to everyone for not providing feedback, work has been hectic lately. I've attached an image of a sketch regarding the noise from plenum boxes. Grille dimensions (and plenums width*lenght) is 1025x75 mm. Taking into consideration an effective area of the grille, air speed thru the grille...
  2. 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.
  3. 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...
  4. mechWatt

    Parallel work of fans vs. pumps

    @LittleInch Just for final clarification: Design calculations determined that at 50k m3/h, system has a pressure loss of 400 Pa. So, if I pick two fans with 25k m3/h @ 400 Pa each, it means that in total, when both fans are operating, I will be getting 50k m3/h? And when only one of them is...
  5. mechWatt

    Parallel work of fans vs. pumps

    Basically, it's not really a conclusion that I came to, it's more of what I've been told. I just wanted to make sure that there is actually no differrence between pumps and fans when it comes to parallel work mode. My problem is that I have a smoke exhaust system that has a workflow of 50 000...
  6. 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...
  7. mechWatt

    Spiral and rectangular ducts worksheet

    @lukaiENG Thank you for your concern, but I used the workshop as an example, to better describe the type of literature/documents that I am trying to find. I am looking for them for my own needs. @dbill74 Tried SMACNA, but had no success so far.
  8. 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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