Johnson shares CTA-designed, do-it-yourself supermarket energy reduction tools at ASHRAE modeling conference

By: Travis Estvold
28 October 2015

CTA energy engineer Tim Johnson, PE, BEMP, LEED AP, GGP, was in Atlanta earlier this month, presenting at the 2015 ASHRAE Energy Modeling Conference, an event which promised to deliver tools for designing high performance buildings — which happens to be something of a CTA specialty.

CLICK HERE to view/download Johnson’s presentation, Refrigeration Playbook: Optimizing Heat Rejection and Refrigeration Heat Reclaim for Supermarket Energy Conservation

As shown, the goal of the presentation was two-fold: (1) To help attendees understand basic refrigeration heat reclaim systems and apply this knowledge to create accurate energy models and effective design strategies. And (2), To aid in calculating the energy impacts associated with reclaiming heat from commercial refrigeration systems in order to confidently guide building owners and designers in optimizing building performance.

Perhaps most importantly, Johnson’s presentation offered links to incredibly helpful evaluative spreadsheets developed by Boise-based members of CTA’s Energy Services team (including Johnson, director Jim Armer, refrigeration engineer Eric Nelson, and refrigeration system designer Chuck Reis). Linked below, these documents are published on the Department of Energy (DOE) and National Renewable Energy Laboratory (NREL) websites; CTA’s Energy Services team has deep experience in working closely with both entities under the Commercial Building Partnership. Yet while CTA stands ready to assist grocery clients with heating, cooling, and energy loss reclamation, the team says these tools are even more valuable because they’re “open source” and designed for do-it-yourself implementation.

The Refrigeration System Front End Spreadsheet [bolded above] generated the most significant interest from attendees of his session, Johnson noted.

“Supermarkets are one of the most energy-intensive building types and more than half of their energy consumption comes from refrigeration and heating, both addressed by the spreadsheets,” he said. “We hope these tools will influence positive changes in the way supermarkets are designed and operated, and equip owners and designers to make informed decisions that will impact their store and our natural resources for years to come.”

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  • scott 3 years ago

    i have been maintaining 3 stores that are 100 percent heat reclaim for years..we nave no heating units at all for the main floor
    and still have excess heat that can be used.i can not understand why anyone would not use this so call waste heat..
    the tools you have posted here are missing the water is not usefull way to recover heat,as the temps we are talking about are around 100 degrees best suted to heat the store..supermarkets are a parasidic heat pump system.cases cool the store, compression heats the stores, dumping what you do not use outside