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Belimo Energy Valve™
Delta T Manager™
Energy Valve Delta T Manager
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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
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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
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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
35
1
350000
30
335000
Power = BTU
300000
2
25
Coil
Power Curve
250000
20
200000
Delta T °F
330000
15
150000
Delta T Curve
10
12°F
10.5°F
100000
5
50000
0
0
0
5
10
15
20
25
30
35
40
45
GPM
50
55
60
55 GPM
65
70
75
80
65 GPM
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Low Delta T
Cost of Overflowing the Coil…
1
2
Δ
BTUh
330,000
335,000
1.5%
GPM
Pump hp
55 GPM
65 GPM
3
Hp increase = (65/55)
18%
65%
HP2  GPM 2 

? 
HP1  GPM 1 
3
Energy Valve Delta T Manager
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Delta T Manager™
Cost of Chiller Staging
Chiller Plant Efficiency
Design Condition
• Design ΔT=12oF (54oF - 42oF)
• 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=10.4oF (52.4oF - 42oF)
•
415 GPM
•
2 Chillers, 45% Load (180 Ton)
415 GPM Loop flow
No change to the load, but a 2nd Pump and 2nd Chiller are started.
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Low Delta T
Cost of Over Pumping
Delta T
Manager Signal
Wasted Pumping
DDC Signal
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
Delta T Manager adjusts the valve if the ΔT drops below the
set point in order to maintain peak coil efficiency
400000
35
Virtually No Power Reduction
350000
335000
325000
30
Delta T Curve
300000
250000
Power Saturation
20
200000
Power Curve
Delta T °F
Power = BTU
25
15
150000
10
Delta T
Set Point
100000
5
50000
0
0
0
5
10
15
20
25
30
35
40
45
GPM
50
55
60
55 GPM
65
70
75
80
65 GPM
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Delta T Manager™
Does it really work?
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Case Study
Large Tech Company in North Carolina
DT Management
Flow Control
Position Control
Energy Valve Delta T Manager
96 GPM
144 GPM
240 GPM
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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
DT = 6.15°F
•
Aug 9 - Oct 9, 2011
DT = 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
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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
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Thank You !
Visit (www.EnergyValve.com)
or Contact Belimo
(800) 543-9038
Thank
You
Energy Valve Delta T Manager
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