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A case study of the CO2 systems in Whole Foods...


About this presentation

related to ATMOsphere America 2017
published on 6 June 2017
14 pages

Tristam Coffin of Whole Foods and Tom D. Wolgamot of DC Engineering presented case studies comparing transcritical CO2, NH3-CO2 cascade and propane systems in Whole Foods stores in northern California.

About the speaker(s)

Tristam Coffin


Tristam Coffin is the Director of Sustainability & Facilities for Whole Foods Market’s Northern California Region. Among his responsibilities, Tristam oversees the implementation of environmentally responsible programs and sustainable engineering initiatives for the 45 stores, regional office, distribution center, and 5 future stores that make up the company’s Northern California Region. Mr. Coffin is a LEED Accredited Professional, expert in resource management and holds a broad array of environmental expertise in areas including waste diversion, refrigeration systems, and renewable energy. He is also a member of the company’s Global Green Mission Leadership Team. Prior to being employed by Whole Foods Market, Mr. Coffin worked in alternative energy and transportation for the Transportation Research Center of Vermont as well as in natural sciences and advocacy in Yellowstone National Park, Montana. Mr. Coffin holds a Bachelors Degree in Environmental Studies from the University of Vermont.

Tom Wolgamot


Tom Wolgamot is a Principal of DC Engineering and works out of Missoula, Montana. He is a licensed PE in eighteen states, and has over 25 years of experience in facility engineering and project management. Tom has led a wide variety of design work from commercial HVAC to campus heating and cooling plants. Tom currently is active on two ASHRAE Refrigeration Technical Committees; 10.1 Custom Engineered Refrigeration Systems and 10.8 Refrigeration Load Calculations.

He really enjoys working in the supermarket refrigeration sector and is proud to be contributing to the industry with a focus on sustainable practices. The heightened interest in reducing carbon footprints through energy efficiency, commissioning, and alternative refrigerants has been especially rewarding. Prior to providing consulting services, Tom was the Director of Engineering for Albertsons, Inc. where he developed the appreciation and skills for balancing fiscal realities with on-going maintenance, energy, and environmental requirements.