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MAXIMIZING DORM ENERGY SAVINGS WITH INTELLIGENT HVAC CONTROLS AASHE CONFERENCE, OCTOBER 11, 2011 Dianne Anderson, NYU Office of Sustainability
MAXIMIZING DORM ENERGY SAVINGS WITH INTELLIGENT HVAC CONTROLS
AASHE CONFERENCE,OCTOBER 11, 2011
Dianne Anderson, NYU Office of Sustainability
Agenda
• Challenges in Residence Halls• About NYU• Finding a Solution to these
challenges• The Solution• Results• Lessons Learned
Source: US Energy Information Administration
Challenges in Residence Halls
Why Now?At Home: Space heating and Air condition = ~49%
1. Continued rise in utility rates2. Technological improvements which make
systems fit a Return on Investment (ROI)3. Proven technology to address challenges4. Green mind shift
• Students leave the room and do not shut off or adjust the setpoint
• Manually monitoring dorm room temperature is impossible– Requires full participation of students, or…– Requires continual room checks and student disruption
• While many students have an increasingly “GREEN” mindset, it doesn’t mean we can always count on them
Challenges in Residence Halls
About NYU’s Residence Halls
• Housing 12,500 students – Owned: 15 Buildings– Leased: 10 Buildings
• Types of Heating/Cooling Units– PTAC (water & steam source)– Heat Pump– Fancoil
• Building Management System– Yes and No
• Wide Variety of types, sizes, voltages, and existing controls
About NYU’s Residence Halls
• Project Goals– Reduce Wasted Heating and Cooling– Lower Utility expenses– Improved controls for students– Demand Curtailment capability– Ability to create campus wide set-point ranges
• Key Requirements– Limit Student Impact – Utilize Campus network between buildings– Remote confirmation of thermostats– Maintainability– No Interference with Campus WIFI– ROI
Looking for a Solution to Challenges
Occupancy Based HVAC Controls
Solution to Challenge: Occupancy based HVAC Controls
– Telkonet Smart Energy System
Installations:Completed: 11 Residence Hall
BuildingsTotaling: 4,629
units
What is a Smart System?• Utilizing Occupancy based controls to eliminate wasted
heating and cooling runtimes in student rooms• Patented Recovery Time™ Technology
Occupancy Based HVAC Controls
Occupancy Based HVAC Controls
• Installation: hardwired or wireless• Networking/Central Management:
– Zigbee: Low Cost, mesh standard networking, simple installation• Additional uses:
• Lighting control• Advanced scheduling• Winter freeze protections
February 2011
EcoSmart Zigbee Network
EcoSmart Zigbee Network
EcoSmart Zigbee Network
• Controlling runtime when the room is Unoccupied– Decreasing runtime means less energy is consumed– Increases life of HVAC unit due to decreased use– Maximizes efficiency and savings
• Imposing (optional) limits on the “allowable” maximum or minimum temperatures, if desired
– Applicable to Occupied and/or Unoccupied states• Participation in Curtailment Events• Less maintenance• Comfort increased• Lowering Peak Demand (Potential)
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Results - Type of Savings
NYU Overall Project
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Carlyle
Alumni
Mercer
D'Agostino
Weinste
in
26th Street
$0.00
$100.00
$200.00
$300.00
$400.00
$500.00
$600.00
Annual Savings per Room
Install Cost per Room
Annual Savings vs. Installation Cost
TSE controller locations
Location Install date Number Networked BMSCooling Savings
(kWh/year)Heating Savings (MMBTU/year)
26th St 2008 442 x 155,584 928
Alumni 2008/2009 483 x 143,451 773
Third North 2009/2011 675 x 229,500 1,823
Founders 2009 412 x 264,504 288
D'Agostino 2009 377 x 183,976 339
Mercer 2009 613 x 299,144 552
Palladium 2010 160 x 102,720 112
Weinstein 2010 320 x 184,000 26
Carlyle 2010 450 x 153,000 1,215
Goddard 2011 137 x 109,737 534
Gramercy Green 2011 560 x 359,520 392
Total 4629 2,185,136 6,982
Total cost savings, annually: $ 646,481
Total cost to install, 2008-2011: $ 1,898,504
Average simple payback, years: 2.9
Percent savings of NYU energy use from TSE controllers: 4.92%
NYU Overall Project
• Thermostat Placement• Maintenance Staff training & involvement• Communication & Support
– Residential Life Dept & Client Services Center
• Student engagement
Lessons Learned
• Mercer –2 Pipe Fan Coil (single mode selection, auto switchover)
• D’Agostino -2 Pipe Fan Coil (single mode selection, auto switchover)
• 26th St. -Island Air, Steam Heat, Compressor Cooling• Alumni Hall – Renovated new Evergreen Packaged units (24v
remote stat capable) • Third North– Renovated new Evergreen Packaged units (24v
remote stat capable)• Founders Hall – New Build, Alerton Control module interfaced
with dry contact for occupancy. • Palladium – Heat Pumps, Existing Alerton control interfaced
into existing BMS reports.• Carlyle – Island Air and Adirondack units• Gramercy – McQuay units (24v remote stat existing)
About NYU’s Residence Halls
Building Cooling Savings
(%)
Heating Savings
(%)
Cooling Savings (hrs/day)
Heating Savings (hrs/day)
Alumni 24.9 25.0 0.96 0.38
Carlyle 23.9 25.7 1.81 0.25
Third North 24.2 29.2 1.19 0.49
Weinstein 41.8 22.2 2.53 0.18
NYU Overall Project
