Transcript Knowledge is Power Belimo Energy Valve*
Belimo Energy Valve™
Delta T Manager™
Energy Valve Delta T Manager 1
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
Energy Valve Delta T Manager 2
Low Delta T
at 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 3
Low Delta T
Some of Low Delta T Causes
•
Low Control Set Point
•
Fouled Coils
•
Low Valve Authority
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Low Delta T
Coil Power vs Delta T Behavior
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Low Delta T
Cost of Overflowing the Coil …
400000 350000
335000 330000
300000 250000
Coil Power Curve 2 1
35 30 25 20 200000 150000 100000 50000
Delta T Curve
0 0 5 10 15 20 25 30 35 40
GPM
45 50 55 60
55 GPM
65 70
65 GPM
75 80 0 15 10
12 °F 10.5
°F
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Low Delta T
Cost of Overflowing the Coil …
BTUh GPM Pump hp
1
330,000
2
335,000 55 GPM 65 GPM Hp increase = (65/55) 3
Δ
1.5% 18% 65%
HP
2
HP
1 ?
GPM
2
GPM
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Delta T Manager™
Cost of Chiller Staging Chiller Plant Efficiency Design Condition
• Design ΔT=12 o F (54 o F - 42 o F) • 360 GPM • 1 Chiller, 90% Load (180 Ton)
360 GPM Loop flow
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Delta T Manager™
Cost of Chiller Staging Chiller Plant Efficiency Low ΔT
• • • ΔT=
10.4
o F
(52.4
o F - 42 o F)
415 GPM 2 Chillers
, 45% Load (180 Ton)
415 GPM Loop flow
No change to the load, but a 2 nd Pump and 2 nd Chiller are started.
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Low Delta T
Cost of Over Pumping Delta T Manager Signal DDC Signal Wasted Pumping Delta T Manager On Delta T Manager On
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Delta T Manager™
Occupant Comfort
“How can I let the Delta T Manager limit flow if it doesn’t measure discharge air temperature?
What about occupant comfort?!?”
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Delta T Manager™
Occupant Comfort
400000 Delta T Manager adjusts the valve if the ΔT drops below the set point in order to maintain peak coil efficiency 35
335000 325000
350000 300000
Virtually No Power Reduction Delta T Curve
30 25 250000
Power Saturation
20 200000
Power Curve
150000 15 10
Delta T Set Point
100000 5 50000 0 0 5 10 15 20 25 30 35 40
GPM
45 50 55 60
55 GPM
65 70
65 GPM
75 80 0 Energy Valve Delta T Manager 12
Delta T Manager™ Does it really work?
Energy Valve Delta T Manager 13
Case Study
Large Tech Company in North Carolina D T Management
Flow Control Position Control
96 GPM
144 GPM 240 GPM Energy Valve Delta T Manager 14
Case Study
MIT 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
D
T = 6.15
°F
•
Aug 9 - Oct 9, 2011
D
T = 12.14
°F
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Case Study
University 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 Energy Valve Delta T Manager 16
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 Belimo Americas Danbury, Connecticut 17
Thank You !
Visit ( www.EnergyValve.com
) or Contact Belimo (800) 543-9038
Thank You
Energy Valve Delta T Manager 18