Chilled Beam Presentation Chilled Beam Presentation • Cooling Load Profile • Chilled Beam Systems • Advantages of Chilled Beam vs VAV • Sample Project Photos • Summary & Questions Cooling Load Profile Sensible Heat Heat which is measured by a thermometer. No Moisture added to the space. Latent Heat Heat which is measured by a humidistat. Moisture added to the space. Sensible Heat Sensible Heat Latent Heat Sensible Heat 70% Sensible Heat and 30% Latent Heat Sensible Heat Air Infiltration Sensible Heat And Latent Heat Sensible Heat Sensible Heat Latent Heat Latent Heat Sensible Heat Cooling Load Profile Water = Efficient Transport 10” 1 Ton of Sensible Cooling (12,000 BTU/HR) Requires 550 CFM of Air or 12” 2.4 GPM of water ¾” diameter water pipe Air Horse Power vs Water Horse Power Three Types of Chilled Beam Systems • Chilled Ceilings (Radiant Chilled Ceilings) • Passive Chilled Beams • Active Chilled Beams Chilled Ceilings 1980 Chilled Ceilings 1990 2000 2010 Chilled Ceilings Radiant Effect C W S u p p ly 5 9 -6 2 °F C W R e tu rn 6 2 -6 6 °F 55% C o n ve ctive 45% R a d ia n t 76°F Dry Bulb 74°F radiant temperature (dry bulb) Passive Chilled Beams 1980 Chilled Ceilings Passive Chilled Beams 1990 2000 2010 Passive Chilled Beams Operation Principle Soffit Suspension rod Water coil Fabric skirt Perforated tile Passive Chilled Beams Airflow Pattern Active Chilled Beams 1980 Chilled Ceilings Passive Chilled Beams Active Chilled Beams 1990 2000 2010 Active Chilled Beam Operation Principle Primary air nozzles Primary Air From Primary air plenum Energy Recovery Unit 55 Deg F to 65 Deg F Induction air flow 100 CFM Suspended ceiling 200 CFM 200 CFM Heat exchanger Water Temp 52 Deg F 2 Deg F Above Dew Point Temp 72 Deg F 300 CFM Active Chilled Beam Airflow Pattern Active Chilled Beams Benefits • Very high cooling capacity – Up to 100 BTUH/FT2 floor space – Up to 2000 BTUH per LF • Integrated cooling, ventilation and heating – All services in the ceiling cavity • Suitable for integration into all ceiling types – Reduces ceiling costs compared to Passive Beams Active Chilled Beams Benefits (Continued) • Significant space savings – Smaller ductwork saves space in shafts, mechanical rooms and ceilings • Can be installed tight up against the slab – Reduced floor to floor heights – Reduced construction costs on new buildings • Low noise levels • Low maintenance – No moving or consumable parts Energy Savings* Compared to VAV Source Technology Application US Dept. of Energy Report (4/2001) Beams/Radiant Ceilings General ASHRAE 2010 Technology Awards Passive Chilled Beams Call Center 41 ACEE Emerging Technologies Report (2009) Active Chilled Beams General 20 ASHRAE Journal 2007 Active Chilled Beams Laboratory 57 SmithGroup Active Chilled Beams Offices 24 *Compared to VAV *Table Data Provided by Dadanco % Saving* 25-30 LEED Certification LEED NC V3.0 • • • • Optimize Energy Performance - up to 48% (new) or 44% (existing) more efficient than ASHRAE 90.1 (EA Credit 1) -up to 19 points Increased Ventilation - 30% more outdoor air than ASHRAE 62 (IEQ Credit 2) - 1 point Controllability of Systems - individual temperature control (IEQ Credit 6.2) - 1 point Thermal Comfort - meet ASHRAE 55 (IEQ Credit 7.1) - 1 point (Minimum 40 points needed for certification out of 100 maximum) Passive Chilled Beams Variants • Recessed Passive Beams • Exposed Passive Beams Active Chilled Beams Active Chilled Beams Active Chilled Beam Design Considerations Building Suitability Building Characteristics that favor Active Chilled Beams • Zones with moderate-high sensible load densities – Where primary airflows would be significantly higher than needed for ventilation • Buildings most affected by space constraints – Hi – rises, existing buildings with induction systems • Zones where the acoustical environment is a key design criterion • Laboratories where sensible loads are driving airflows as opposed to air change rates • Buildings seeking LEED or Green Globes certification Building Suitability Characteristics that less favor Active Chilled Beams • Buildings with operable windows or “leaky” construction – Beams with drain pans could be considered • Zones with relatively low sensible load densities • Zones with relatively low sensible heat ratios and low ventilation air requirements • Zones with high filtration requirements for the recirculated room air • Zone with high latent loads Construction Costs Reduced height Floor heights reduced 10”-14” Overall height reduced by 6’ HVAC Advantages Savings Compared to VAV • • • • • Smaller AHU’s Smaller Ductwork Less Noise Low Maintenance Lower Electrical Infrastructure Cost • Less Fan HP • Lower Operating Cost STORIES FROM THE AUDIENCE? Questions?