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  1. camago

    Heat recovery ventilation unit

    Actually I have 75 CFM, I decided to put a 0.5 kw heater after the HRV to raise the temperature of the ventilation air in the winter. Thanks 317069, do you think we can make the design without the duct heater even with -23 C in the winter? Thanks
  2. camago

    Heat recovery ventilation unit

    Hi , I am designing the ventilation system for a condo building, I am using a heat recovery ventilation unit to recover the energy from the bathroom. Do you think I need to add an electric duct heater for the cold air, or is enough using the heat exchanger? Is it better to put the heater...
  3. camago

    Concrete duct static loss

    Thanks very much Chasbean1, Do you think that I can also calculate the friction loss with the ductulator and the use a correction factor depending on the velocity from HVAC rules of Thumb?
  4. camago

    Concrete duct static loss

    I want to know how to calculate the static pressure losses in a concrete duct. Thanks

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