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HVAC system revamping in commercial building gave 30% energy savings

Location : Riyadh, Saudi Arabia

Industry : Public Utility Building

Equipment under scope :

  • Chillers – 504 kW x 3 No.s, SPC – 1.6 to 2.2 KW/TR

Benefits Achieved :

  • Chiller SPC improved - 0.9-1.3 kW/TR
  • HVAC energy savings - 46%
  • Monetary saving - 0.35 mil USD/year
  • Payback period < 1 year

Green Flame Advantage :

Optimum sizing of chillers using dual approach long term data logging & building energy modelling, Helped customer to choose “Right solution” from available options.


APPROACH

Onsite data collection, Chiller, pumps COP & efficiency measurement, data logging for 1 week, Building Energy Modelling using eQUEST.


FINDINGS

  • Chiller earlier was slightly oversized and was unable to address the performance at part load. Being oversized earlier it was unable to work at its optimum efficiency.
  • Atmospheric conditions in Saudi Arabia are dry and hot. Hence condensing temperature during the day was around 40-50°C.
  • Chilled water primary and secondary pumps earlier were not running close to duty point. Further, they were unable to give right amount of flow required by chiller.
  • Chiller earlier was slightly oversized and was unable to address the performance at part load. Being oversized earlier it was unable to work at its optimum efficiency.
  • Atmospheric conditions in Saudi Arabia are dry and hot. Hence condensing temperature during the day was around 40-50°C.
  • Chilled water primary and secondary pumps earlier were not running close to duty point. Further, they were unable to give right amount of flow required by chiller.
  • Replacement of old chillers with new right sized high efficiency VSD chillers (504 kW x 3 No).
  • Adiabatic cooling system on condensers for air cooled chillers.
  • Replacement by rightsized pumps and VFD on Primary Pumps.
  • Chiller Plant Manager system
  • Replacement of old chillers with new right sized high efficiency VSD chillers (504 kW x 3 No).
  • Adiabatic cooling system on condensers for air cooled chillers.
  • Replacement by rightsized pumps and VFD on Primary Pumps.
  • Chiller Plant Manager system