Overall Rating Gold - expired
Overall Score 65.52
Liaison Andrew D'Amico
Submission Date Feb. 28, 2018
Executive Letter Download

STARS v2.1

Princeton University
IN-24: Innovation A

Status Score Responsible Party
Complete 1.00 / 1.00 Thomas Nyquist
Executive Director
Engineering and Campus Energy
"---" indicates that no data was submitted for this field

Name or title of the innovative policy, practice, program, or outcome:
Heat Concentrating Chiller Project

A brief description of the innovative policy, practice, program, or outcome that outlines how credit criteria are met and any positive measurable outcomes associated with the innovation:
The International District Energy Association (IDEA)'s Innovation award seeks to uncover creative solutions, expand awareness and shine spotlight on best practices below the system level.

IDEA awarded Princeton University with the 2017 Innovation Award for creatively addressing a long-time, industry-wide problem of low Delta T in a remote location within a chilled water distribution system.

Primarily a process load, every practical remedy has been applied but without success. For many years at Princeton University, 1 out of 180 customer buildings handicapped the operation of the entire network, requiring Princeton to unnecessarily run large equipment for long periods of time, and preventing the system from ever taking advantage of free cooling. Princeton then installed what it calls a “Heat Concentrating Chiller” at this problem site and uses its district chilled water inside a tertiary loop as well as its condenser loop. The result was a new supply and return Delta T of 26°F vs. the historic 4°F or 5°F. Today, the customer receives its 41°F water even in winter, when the rest of the campus can operate with 47°F or 48°F.

Which of the following impact areas does the innovation most closely relate to? (select up to three):

A letter of affirmation from an individual with relevant expertise or a press release or publication featuring the innovation :

The website URL where information about the innovation is available :
Additional documentation to support the submission:

Data source(s) and notes about the submission:

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