| Overall Rating | Gold |
|---|---|
| Overall Score | 68.42 |
| Liaison | Andrew D'Amico |
| Submission Date | Aug. 25, 2021 |
Princeton University
OP-5: Building Energy Efficiency
| Status | Score | Responsible Party |
|---|---|---|
|
3.86 / 6.00 |
Thomas
Nyquist Executive Director Engineering and Campus Energy |
"---"
indicates that no data was submitted for this field
Part 1. Site energy use per unit of floor area
Performance year energy consumption
| kWh | MMBtu | |
| Imported electricity | 88,251,000 Kilowatt-hours | 301,112.41 MMBtu |
| Electricity from on-site, non-combustion facilities/devices (e.g., renewable energy systems) | 0 Kilowatt-hours | 0 MMBtu |
Stationary fuels and thermal energy, performance year (report MMBtu):
| MMBtu | |
| Stationary fuels used on-site to generate electricity and/or thermal energy | 1,196,800 MMBtu |
| Imported steam, hot water, and/or chilled water | 0 MMBtu |
Total site energy consumption, performance year:
1,497,912.41
MMBtu
Performance year building space
9,628,405
Gross square feet
Floor area of energy intensive space, performance year:
| Floor area | |
| Laboratory space | 2,844,871 Square feet |
| Healthcare space | 35,211 Square feet |
| Other energy intensive space | 1,803,516 Square feet |
EUI-adjusted floor area, performance year:
17,192,085
Gross square feet
Performance year heating and cooling degree days
| Degree days | |
| Heating degree days | 4,689 Degree-Days (°F) |
| Cooling degree days | 1,177 Degree-Days (°F) |
Total degree days, performance year:
5,866
Degree-Days (°F)
Performance period
| Start date | End date | |
| Performance period | July 1, 2019 | June 30, 2020 |
Metric used in scoring for Part 1
14.85
Btu / GSF / Degree-Day (°F)
Part 2. Reduction in source energy use per unit of floor area
Baseline year energy consumption
STARS 2.2 requires electricity data in kilowatt-hours (kWh). If a baseline has already been established in a previous version of STARS and the institution wishes to continue using it, the electricity data must be re-entered in kWh. To convert existing electricity figures from MMBtu to kWh, simply multiply by 293.07107 MMBtu/kWh.
| kWh | MMBtu | |
| Imported electricity | 78,748,196 Kilowatt-hours | 268,688.84 MMBtu |
| Electricity from on-site, non-combustion facilities/devices (e.g., renewable energy systems) | 0 Kilowatt-hours | 0 MMBtu |
Stationary fuels and thermal energy, baseline year (report MMBtu):
| MMBtu | |
| Stationary fuels used on-site to generate electricity and/or thermal energy | 1,469,670 MMBtu |
| Imported steam, hot water, and/or chilled water | 0 MMBtu |
Total site energy consumption, baseline year:
1,738,358.84
MMBtu
Baseline year building space
8,158,600
Gross square feet
Baseline period
| Start date | End date | |
| Baseline period | July 1, 2005 | June 30, 2006 |
A brief description of when and why the energy consumption baseline was adopted:
The baseline was adopted because this timeframe was prior to the inception of the University’s Sustainability Plan in 2007-2008.
Source energy
3.14
Total energy consumption per unit of floor area:
| Site energy | Source energy | |
| Performance year | 0.16 MMBtu per square foot | 0.22 MMBtu per square foot |
| Baseline year | 0.21 MMBtu per square foot | 0.28 MMBtu per square foot |
Metric used in scoring for Part 2
21.53
Optional Fields
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A brief description of the institution's initiatives to shift individual attitudes and practices in regard to energy efficiency:
Emails are sent out to students reminding them to unplug and shut off their appliances and lights before they leave campus for extended breaks. Select buildings on campus, such as the Andlinger Center for Energy and the Environment, contain informational signage that explain the energy-efficiency measures in the building.
Additionally, the University partnered with a company called Wattvison to develop a real-time campus energy dashboard called Tiger Energy which continuously tracks and compares residential colleges by their energy usage. Although the platform enables year-round comparisons and includes energy-saving tips, a month-long energy reduction competition among the colleges in the spring is a specific outreach effort to raise awareness about energy-efficient practices while encouraging energy-saving behaviors.
Additionally, the University partnered with a company called Wattvison to develop a real-time campus energy dashboard called Tiger Energy which continuously tracks and compares residential colleges by their energy usage. Although the platform enables year-round comparisons and includes energy-saving tips, a month-long energy reduction competition among the colleges in the spring is a specific outreach effort to raise awareness about energy-efficient practices while encouraging energy-saving behaviors.
A brief description of energy use standards and controls employed by the institution:
The University uses full distributed digital control (DDC) systems in about 150 buildings on campus, which includes all of the heaviest energy-use buildings. Each building’s spaces have schedules each day to ensure that systems are off for spaces that are unoccupied.
The University uses a variety of occupancy sensor technologies, including dual technology, vacancy sensors, wireless sensors, and light level (i.e. daylight harvesting) sensors.
Digital thermostats, sensors, and radiant panel heating systems adjust heating and cooling temperatures according to various factors, such as occupancy and conservation targets of heating to 68°F in the winter and cooling to 78 °F in the summer. Buildings such as Frick Chemistry have been designed to facilitate cascading air flows which allow laboratories and office areas to be cooled while minimizing use of air conditioning.
The University uses a variety of occupancy sensor technologies, including dual technology, vacancy sensors, wireless sensors, and light level (i.e. daylight harvesting) sensors.
Digital thermostats, sensors, and radiant panel heating systems adjust heating and cooling temperatures according to various factors, such as occupancy and conservation targets of heating to 68°F in the winter and cooling to 78 °F in the summer. Buildings such as Frick Chemistry have been designed to facilitate cascading air flows which allow laboratories and office areas to be cooled while minimizing use of air conditioning.
A brief description of Light Emitting Diode (LED) lighting and other energy-efficient lighting strategies employed by the institution:
Before the campus-wide LED conversion, the University used LEDs for street lighting, conference rooms, audiovisual rooms, wall washing, and downlighting.
A brief description of passive solar heating, geothermal systems, and related strategies employed by the institution:
Princeton's first ground source heat (“geothermal”) pump system installed in 2003 was one of the most extensive in New Jersey, serving 200 units at Lawrence Apartments. Three other locations, Campus Club, Lakeside Graduate Housing complex, and the new Lewis Center for the Arts complex are also heated and cooled in this way.
A brief description of co-generation employed by the institution:
The electric generator, powered by a General Electric LM-1600 gas turbine that burns natural gas or diesel fuel, is a cogeneration facility. What would normally be wasted exhaust heat from the turbine is recovered to heat water and make steam. Through cogeneration and other waste heat recovery, the efficiency of Princeton’s plant rises to the range of 80 percent vs. 25-40 percent for a typical utility energy plant. The cogeneration plant can generate 15 megawatts of electricity, about equal to Princeton’s average electricity needs on a given day. The Princeton turbine was the first of its kind in the world to earn certification to operate on bio-diesel fuel. However, due to supply issues, the conversion was not carried out.
A brief description of the institution's initiatives to replace energy-consuming appliances, equipment, and systems with high efficiency alternatives:
The University has a commitment to replace energy-consuming appliances, equipment, and systems with high-efficiency alternatives when possible. For example, the University has already replaced many of its campus dishwashers and laundry machines with high-efficiency alternatives and is currently replacing most of its campus lighting with LED bulbs. The Princeton energy plant is also being upgraded with more energy-saving technologies such as pumps with variable frequency drivers.
Website URL where information about the institution’s energy conservation and efficiency program is available:
Additional documentation to support the submission:
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Data source(s) and notes about the submission:
Additional Links:
Tiger Energy: https://tiger-energy.appspot.com/demand/res-colleges
Grid-purchased electricity represents purchased electricity for all areas reported by the University in its CO2 footprint.
Electricity generated from on-site renewables represents energy from the University’s 4.5 MW AC solar PV system. Note that the University accounts for this output as grid-average emissions, not zero CO2, since the University currently sells the SRECs produced by the system.
Since the baseline year (FY 2006), Princeton University's campus square footage has grown by over 1 million square feet. Despite this growth, Princeton's total building energy consumption is nearly the same as it was in FY 2006 due to campus-wide efficiency improvements, which are described further in this section.
Tiger Energy: https://tiger-energy.appspot.com/demand/res-colleges
Grid-purchased electricity represents purchased electricity for all areas reported by the University in its CO2 footprint.
Electricity generated from on-site renewables represents energy from the University’s 4.5 MW AC solar PV system. Note that the University accounts for this output as grid-average emissions, not zero CO2, since the University currently sells the SRECs produced by the system.
Since the baseline year (FY 2006), Princeton University's campus square footage has grown by over 1 million square feet. Despite this growth, Princeton's total building energy consumption is nearly the same as it was in FY 2006 due to campus-wide efficiency improvements, which are described further in this section.
The information presented here is self-reported. While AASHE staff review portions of all STARS reports and institutions are welcome to seek additional forms of review, the data in STARS reports are not verified by AASHE. If you believe any of this information is erroneous or inconsistent with credit criteria, please review the process for inquiring about the information reported by an institution or simply email your inquiry to stars@aashe.org.