belimo energy valve™ delta t manager™
DESCRIPTION
Belimo Energy Valve™ Delta T Manager™. Presentation Agenda. Low Delta T at the Coil Some of Low Delta T Causes Low Delta T Cost of Overflowing Coil Cost of Chiller Staging Cost of Over Pumping Occupant Comfort Does it Really Work? Benefits. Low Delta T at the Coil. - PowerPoint PPT PresentationTRANSCRIPT
1Energy Valve Delta T Manager
Belimo Energy Valve™Delta T Manager™
Presentation Agenda
• Low Delta T at the Coil• Some of Low Delta T Causes• Low Delta T
• Cost of Overflowing Coil• Cost of Chiller Staging• Cost of Over Pumping• Occupant Comfort
• Does it Really Work?• Benefits
2Energy Valve Delta T Manager
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Low Delta Tat the Coil
Low Coil Delta T = Inefficient Heat Transfer
Increase GPM >> No Increase in Energy output
More Pump HP >> Reduction in Plant Efficiency
Energy Valve Delta T Manager
Low Delta TSome of Low Delta T Causes
• Low Control Set Point
• Fouled Coils
• Low Valve Authority
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Low Delta TCoil Power vs Delta T Behavior
Energy Valve Delta T Manager
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0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 800
50000
100000
150000
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250000
300000
350000
400000
0
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GPM
Pow
er =
BTU
Del
ta T
°F
335000
10.5°F
65 GPM
12°F
55 GPM
330000
CoilPower Curve
Delta T Curve
1
2
Low Delta TCost of Overflowing the Coil…
Energy Valve Delta T Manager
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Pump hp Hp increase = (65/55)3 65%
1 2 ΔBTUh 330,000 335,000 1.5%GPM 55 GPM 65 GPM 18%
3
1
2
1
2
GPMGPM
HPHP
?
Low Delta TCost of Overflowing the Coil…
Energy Valve Delta T Manager
Delta T Manager™Cost of Chiller Staging
Chiller Plant Efficiency
• Design ΔT=12oF (54oF - 42oF)
• 360 GPM
• 1 Chiller, 90% Load (180 Ton)
Design Condition
360 GPM Loop flow
8Energy Valve Delta T Manager
Chiller Plant Efficiency
Low ΔT
• ΔT=10.4oF (52.4oF - 42oF)
• 415 GPM• 2 Chillers, 45% Load (180 Ton)
No change to the load, but a 2nd Pump and 2nd Chiller are started.
415 GPM Loop flow
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Delta T Manager™Cost of Chiller Staging
Energy Valve Delta T Manager
Low Delta TCost of Over Pumping
Wasted Pumping
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Delta T Manager Signal
DDC Signal
Delta T Manager On
Delta T Manager On
Energy Valve Delta T Manager
Delta T Manager™Occupant Comfort
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“How can I let the Delta T Manager limit flow if it doesn’t measure discharge air temperature?
What about occupant comfort?!?”
Delta T Manager™Occupant Comfort
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0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 800
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100000
150000
200000
250000
300000
350000
400000
0
2
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GPM
Pow
er =
BTU
Del
ta T
°F
65 GPM
Power Curve
Delta T Curve
Delta T Manager adjusts the valve if the ΔT drops below the set point in order to maintain peak coil efficiency
55 GPM
Power Saturation
Virtually No Power Reduction
Delta TSet Point
Energy Valve Delta T Manager
335000325000
Delta T Manager™
Does it really work?
13Energy Valve Delta T Manager
Case StudyLarge Tech Company in North Carolina
Position Control240 GPM
144 GPM
96 GPM
Flow Control
DT Management
14Energy Valve Delta T Manager
Case StudyMIT University Hayden Library - Boston, MA
Building and Project Details• 150,000 sq. ft. on 3 floors• 6 AHU provide majority of the cooling
Results• Aug 9 - Oct 9, 2010
DT = 6.15°F
• Aug 9 - Oct 9, 2011DT = 12.14°F
15Energy Valve Delta T Manager
Case StudyUniversity of Miami Hospital
Building and Project Details• Rosenstiel Building• 11 AHUs• 2600 Tons of Cooling• Over 10,000 GPM
Results• Delta T raised from
5.5°F to 10.5°F• Flow ~ 5600 GPM• Estimated $66,000/yr savings• Estimated 2.9 year payback
16Energy Valve Delta T Manager
Delta T Manager™Benefits
• Coil• ΔT Managing for peak coil efficiency• Optimization in retro-fit applications
• Chiller Plant• Improved chilled water plant efficiency • Released chiller capacity
• Pump• Reduced pump energy
• Occupant Comfort• No reduction in supplied energy
17Belimo Americas Danbury, Connecticut
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Thank You !
Visit (www.EnergyValve.com)
or Contact Belimo(800) 543-9038
Thank You
Energy Valve Delta T Manager