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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)
14
Results - Type of Savings
NYU Overall Project
15
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