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  1. greenen

    VRV Selection and new EU F-Gas Reductions

    Hi All, As you may know the EU is looking to reduce the use of HCF gases. This includes common refrigerants such as R-410a. The multi-split VRV/VRF industry heavily uses R-410a. How do you think the new rules will affect the selection of VRV/VRF for new mechanical systems? From my research, the...
  2. greenen

    Why don't air cooled chillers operate as a heat pump?

    Hi all, I am a new junior engineer and have a question about air cooled chillers and heat pumps. Basically, why don't manufactures offer air cooled chillers that can heat the building water as well as chill it for air conditioning purposes? From what I know about heat pumps is that they are...
  3. greenen

    Pressure Loss Through Symmetrical Wye

    Hello all, first time poster here. I have a HVAC pressure loss problem and I am stuck. Here is the background info. I am working on an HVAC renovation project for a commercial office and we are redoing a portion of the return duct work. I am calculating the pressure drop in the return line to...

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