Hannah Shabb

Journal Entry For
Module 9 - HVAC Systems

Overall HVAC system strategy (based on Psychrometric Chart from Climate Consultant)

  • Fluid-Based Heating Sysyem (passive cooling only when needed)
    • Radiant heating on floors
    • Passive solar direct gain heating
    • Seattle and the climate zone is generally pretty cool, so air conditioning is likely not needed
    • Can open windows/use passive ventilation when need cooling
    • Heating is main demand that is needed
  • Solar on roof to provide energy for these loads
  • image

Heating strategy and how you implemented it in your design

  • Heating was mainly done through passive solar gain, radiant floors and very high R-value walls, windows, foundations and roofing

Cooling strategy and how you implemented it

  • Little to no cooling is needed as the climate zone needs basically only heating
  • When needed, natural ventilation through opening of windows can be used

Any special HVAC system challenges that you encountered

  • Heat loss through windows and walls was relatively high. The most important element of keeping the building warm enough was using very thick walls and windows with high R-values
  • Initially when I did the HVAC analysis, almost all the heat was being lost to the walls and windows, and especially to the windows
    • I adjusted the R-values to reduce heat loss (adjustment shown below)
    • Initial Schematics


      Adjusted Schematics


      Ducts, Supply/Return Air Layout


      Basic Radiant Floor Modeling