Secondary Summer Cooling
Mode#2: DOAS Flow (sensible air). Water‐Side Economizer Geothermal Heat Pump Option.
These operations basically allow more OA with lower temperatures to go directly to space at semi load‐neutral conditions without requiring compressors to be on.
Mode#2: DOAS Flow (sensible air). Water‐Side Economizer Geothermal Heat Pump Option.
These operations basically allow more OA with lower temperatures to go directly to space at semi load‐neutral conditions without requiring compressors to be on.
OPEN
• Outside Air Louver • Bypass Valve for 100% bypass CLOSE • Recirculated Damper because this warmer yet stale return air is not needed to bring up the air temperature (the geothermal water temperature mixed with outside air will suffice) |
If Loop Water Temp. > Precooling Coil Air Temp., then OPEN
• Hot Water Valve to use loop water for reheating in sync with precooling coil (which equates to a sensible tempering reheat coil), thus allowing 100% OA at 55 F to be heated to about 70 F to supply to space If Loop Water Temp. < Precooling Coil Air Temp., then OPEN • Hot Water Valve to use loop water for cooling in sync with precooling coil (which equates to a sensible tempering chilled water coil) |