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?