Hi,

We are working on a healthcare project which is 365,000 Sq.ft in area. As of now, the project team has proposed air cooled chiller, AHU serves for major areas and FCU serves for rest of the areas.Also note that, all the airside systems are constant air volume. 

We are refering ASHRAE 90.1.2010 Appendix G/PRM Only. As per Appendix G, the baseline system is system 8 - Water cooled chiller with VAV System. We are unable to get any savings when comparing the baseine with proposed design, becuase of less air-cooled chiller COP,constant air volume airside system & 100% OA in majority of spaces.

Our questions are,

  1. Is there any exceptions to change the basline system?
  2. which spaces are applicable in healthcare building to change the baseline system?
  3. Which spaces are applicable to consider 100% OA in both Basecase & Proposed Case?
  4. Also, please let us know any measures to consider specifically for healthcare applications.

Here the list of spaces & area,

  • Inpatient Bed 140,000 Sq.ft
  • Theatres 15,000 Sq.ft
  • Lab/Diagnostics 15,000 Sq.ft
  • Outpatient 25,000 Sq.ft
  • Clinic - Support 45,000 Sq.ft
  • Non Clinic - Support 55,000 Sq.ft
  • Lobby Area 15,000 Sq.ft
  • Emergengy Department 55,000 Sq.ft

proposing water cooled chiller instead of air cooled chiller is not possible. So, we need the voluable clarifications and support from your side.

Thanks.