VENTILATION: : THE 'VV' IN HVAC
VENTILATION: : THE 'VV' IN HVAC
VENTILATION: : THE 'VV' IN HVAC
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POWERFUL BUS<strong>IN</strong>ESS2011<strong>VENTILATION</strong>: <strong>THE</strong> ‘V’ <strong>IN</strong> <strong>HVAC</strong>Dick Moeller, PEPrincipal, FASHE, LEED APJune 8, 2011
CDi Engineers
CDi Engineers
CDi Engineers
CDi Engineers
Health Care Code ChangesASHRAE 170:•Revise pressurization requirements•Allow the use of displacement ventilation in specificareas•Revise final filter requirements•Reviewing the use of active/passive chilled beams•Reviewing air change/outdoor air requirementsCDi Engineers
Displacement Ventilation: (Wiki)Displacement systems introduce air at low velocities tocause minimal induction and mixing.This system is primarily used for ventilation and spacecooling applications. The displacement outlets are usuallylocated at or near the floor.The system utilizes buoyancy forces (generated by heatsources such as people, lighting, computers, electricalequipment, etc.) in a room to move contaminants and heatfrom the occupied zone to the return or exhaust grillesabove.CDi Engineers
Thermal Displacement Ventilation(TDV)DisplacementventilationMixed flow ventilationCDi Engineers
Patient Room w/Overhead <strong>HVAC</strong>Patient Room w/DisplacementVentilationCDi Engineers
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Chilled BeamHospitalCDi Engineers
Waiting RoomPatient RoomCDi Engineers
Chilled Beam Technology•••Sensible heat removal only‘Dry’ air supply required for latent gains (Dehumidification)Water supply temperature must be above dew point(condensation)(55-59 degrees F vs. 42-45 degrees F)Less energy required to cool waterIncreased viability for geothermal, heat recovery chiller, etc.CDi Engineers
‘ThermalBeams’CDi Engineers
Passive Chilled BeamsConcrete soffitSuspended CeilingCDi Engineers
Active Chilled BeamsCooling & Heating Mode2 Pipe Cooling Only4 Pipe Cooling & Heating2 Pipe Heating OnlyCDi Engineers
“Verticle/Horizontal Beams”CDi Engineers
COMB<strong>IN</strong>ED SYSTEMSCHILLED BEAM, DISPLACEMENT,CONVECTIVEPassiveChilled BeamReturn GrilleFloor DiffusersCDi Engineers
New BuildingCommissioning Benefits:OwnerContractorDesignTeamCDi Engineers
Existing BuildingCommissioning Benefits:OwnerOwnerOwnerCDi Engineers
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