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Chiller Plants Overall Energy Efficiency
2Belimo Americas Danbury, Connecticut
Source:
PlantManufacturer Chiller Plant
Efficiency Coefficient♦
A (Office) 4.26
B (Museum) 4.78
C (Bank) 3.15
D (Office) 3.87
Average Chiller Plant Efficiency Coefficient♦
2.02
2.87
2.14
0.84
Actual Delta T [F]
2.4
2.8
3.6
0.7
♦ Higher Efficiency Coefficient reflects higher plant efficiency
Chiller Plants Overall Electric Consumption
3Belimo Americas Danbury, Connecticut
Chillers Avg51%
Pumps Avg
25.5%
Plant A (Office)
Plant D (Office)Plant C (Bank)
Plant B (Museum)
US Cooling Energy Usage
4Belimo Americas Danbury, Connecticut
15%
85%
Cooling EnergyOther US Residential & Commercial Electric Energy
Source: US Energy Information Administration (eia)How much electricity is used for cooling in the United States?(www.eia.gov/tools/faqs/faq.cfm?id=98&t=3)
11%
89%
Cooling Energy
Other US Electric Energy
Belimo Energy Valve™is the Solution
5Belimo Americas Danbury, Connecticut
The Energy Valve is a:Pressure Independent
Control Valve
with an integrated Delta T Manager
Belimo Energy Valve™
6Belimo Americas Danbury, Connecticut
• Chilled Water Plant Energy Consumption• Energy Valve Benefits and Features• Risk Free Investment• Savings Estimator• Case Studies• www.energyvalve.com
Belimo Americas Danbury, Connecticut
7
Pressure Dependent 240 GPM
144 GPM
96 GPM
Pressure Independent (PI)
Delta T Manager + PI
Pressure Independent and Delta T ManagerPump Savings in Large Tech Company in NC
♦ Pressure Independent♦ Pressure Dependent
Belimo Americas Danbury, Connecticut
9
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 801
50001
100001
150001
200001
250001
300001
350001
0
2
4
6
8
10
12
GPM
Po
we
r =
kB
TU
/hr
De
lta
T °
F
335
10.5°F
65 GPM
12°F
55 GPM
330
CoilPower Curve
Delta T Curve
1
2
Benefits of using Energy ValveSave Energy
Belimo Americas Danbury, Connecticut
10
Pump hp Hp increase = (65/55)3 65%
1 2 Δ
kBTU/hr 330 335 1.5%
GPM 55 GPM 65 GPM 18%
3
1
2
1
2
GPM
GPM
HP
HP
Low Delta TCost of Overflowing the Coil…
Belimo Americas Danbury, Connecticut
11
Low Delta TCost of Chiller Staging
Chiller Plant Efficiency
• Design delta T=12oF (54oF - 42oF)
• 360 GPM
• 1 Chiller, 90% Load (180 Ton)
Design Condition
360 GPM Loop flow
Belimo Americas Danbury, Connecticut
12
Chiller Plant Efficiency
A drop in delta T causes more GPM
Low delta T
• Delta T=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.If cooling towers exist, additional cooling tower and pump may start.
415 GPM Loop flow
Low Delta TCost of Chiller Staging
Features of Energy Valve
13Belimo Americas Danbury, Connecticut
• Power Control maintains coil power regardless of system variations
• Built-in Energy Metering• Multiple Communication
Options
Belimo Americas Danbury, Connecticut
14
Power ControlDefinition
What is Power Control ?• A control algorithm that
creates a Linear relationship between control signal and kBTU/hr output
• Power Control maintains a coil power set point regardless of pressure and temperature fluctuations
Control Signal
0 10
00
0V 10V
Co
il P
ow
er (
kBT
U/h
r)
Belimo Americas Danbury, Connecticut
15
• Power Control allows the controller to deliver exact energy to the space• 0 to 10 VDC = 0 to 100% kBTU/hr Capacity
Co
il P
ow
er (
kBT
U/h
r)
0V 10V
Control Signal
0 10
00
3V
300
Example: 83 Ton AHU83 Tons ~ 1000 kBTU/hr coil
3 VDC = 300 kBTU/hr
7.5 VDC = 750 kBTU/hr
7.5V
750
Power ControlExample
Belimo Americas Danbury, Connecticut
16
Belimo Energy Valve™Energy Metering
• By measuring Flow (Electronic Flow Sensors)and
• Delta Temperature (RTD sensors)
• the Energy Valve can calculate Power/Energy
Power: Q (BTU/hr) = 500 x Flow (GPM) xTemperature Change (°F)
Belimo Americas Danbury, Connecticut
17
Belimo Energy Valve™Energy Metering Usage
• Energy Measurement
• Use as System Verification Tool during commissioning.
• Establishes a baseline performance for operation over time.
• Contributes to LEED.
Belimo Americas Danbury, Connecticut
19
Belimo Energy Valve™Communication: Web Server
• Energy Analysis• Flow and Temperature Analysis• Comparative Analysis
Belimo Americas Danbury, Connecticut
21
Energy Efficiency is a Low Risk Investment
Source: Laitner, J., Ehrhardt-Martinez, K. and Prindle, W., 2007, “American Energy Efficiency Investment Market”, Energy Efficiency Finance Forum, American Council or and Energy Efficient Economy .
Belimo Americas Danbury, Connecticut
24
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, 2011
DT = 12.14°F
Belimo Americas Danbury, Connecticut
25
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