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  1. David_HVAC_Learning

    As a Mechanical Designer, what are some useful things to learn from the EE side of HVAC?

    Hey guys, I'm currently studying topics about HVAC before I try to get a job as a mechanical engineering designer and I'm currently interested in learning about the different electrical engineering aspects in HVAC, specifically the ones that would be useful for an ME designer to know. For the ME...
  2. David_HVAC_Learning

    Questions regarding Fan Performance Curve

    Chasbean1, do you mind diving a bit more into what you said in regards to duct sizing not matter? If I'm getting it right, you're saying that according to a fan performance curve, it does not matter what size duct they used in testing for the inlet or outlet, the fan will perform the same for...
  3. David_HVAC_Learning

    Questions about BHP on Fan Performance Curve and also How to Select a Motor for a Fan

    So, I recently found out that the power that a motor has and uses are two different things (from what I understand). So the input power of a motor is electrical power, using the equation P = I*V, and the output power is mechanical power, which can be calculated using the equation P =...
  4. David_HVAC_Learning

    Questions regarding System Effect

    Thank you for your replies, in regards to my question, it was more of trying to understand why system effect is so important at inlet and outlet from a physics perspective rather than the repercussions for not designing for it. I'd like to try to give a response to MintJulep's comment so I can...
  5. David_HVAC_Learning

    Questions regarding System Effect

    So, I've been reading this paper from Carrier in regards to the application of fans in commercial HVAC Equipment (Link to White Paper below) and I have a few questions regarding system effect. First, here is a following excerpt from the paper (Page 6), saying, "Since the velocity profile at the...
  6. David_HVAC_Learning

    Questions regarding Fan Performance Curve

    Okay so from what I've gathered, essentially I'm getting confused because I'm assuming that the x-axis is zero which is not the correct assumption to make because it would make no sense for air to be flowing if there is a zero pressure differential. Okay. That makes sense. Thank you for your...
  7. David_HVAC_Learning

    Questions regarding Fan Performance Curve

    So, the above figure, is almost the same figure that is shown in the 2016 ASHRAE Handbook - HVAC Systems and Equipment (Page 21.4) with Total Pressure being defined as the fan total pressure at the outlet minus the fan total pressure at the inlet. This figure is shown in the handbook when it's...
  8. David_HVAC_Learning

    Question about Selecting Blade Type for an AHU/RTU

    So, I'm trying to learn what's done in the Mechanical Engineering HVAC Industry in regards to selecting a blade type for a fan. I've looked at Table 1 for Types of Fans in the ASHRAE HVAC Systems and Equipment Handbook and there it talks about the different blade types (airfoil, backward curved...

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