Thermal energy storage tank design

Hi Dee, We’re considering employing technology for thermal storage by Shifted Energy, who I just learned about last week at the NetZero conference in LA. Randall E. Fish | Director of Business Development Shifted Energy | Accelerate Renewable Integration Mobile: 925-336-4876 Hilary Noll— Senior Associate, Sustainability Integration Leader AIA, LEED AP BD+C, Fitwel Ambassador (415) 489 4860 mithun.com Seattle | San Francisco | Los Angeles Fro

Hi, We’ve done six large elementary schools with thermal storage tanks. They have worked well for several years. our MEP engineers designed the system and I don’t recall that they needed specialized expertise. I think the brand was Calmac. Paul C. Hutton, FAIA Principal Cuningham Group Architecture 601 S Broadway, Suite N Denver, Colorado 80209 303-861-1600 office 303-883-8944 mobile Sent from my iPhone On O

LMN has worked on one –Brooks Sports HQ – with WSP and McKinstry. The lead engineer fromWSP – Tom Marseilles – just left WSP and joined Integral Group. The project was outcome based and included a phase change material tank. We believe it’s working well. https://www.brooksrunning.com/en_us/meet-brooks/hq -Kjell From: Dee

We did a phase change tank at Federal Center South (also with WSP/Flack & Kurtz [at the time], though we worked with Andrew Corney and the Built Ecology team. I don’t remember the brand of tank, but it came from China, was new to our team (we were designing the project a decade ago), and hasn’t worked as well as expected. While the building was largely performing as expected overall energy-wise, the PCM tank was not – while it certainly stored some thermal energy, temperature data from the tank never “flat-lined” at the phase change temp [mid 50oF], which is what you expect to happen when it freezes. Never got the full explanation, but the assumption was that this was an issue with this specific product. Presumably, now, there are a lot more products out there with proven track records. Chris Flint Chatto Associate AIA, LEED AP BD+C Principal ZGF ARCHITECTS LLP T 503.863.2324 E chris.chatto@zgf.com 1223 SW Washington Street, Suite 200 Portland, OR 97205 From: Pau

Dave Walsh here with Sellen Construction, the design-builder for the Federal Center South project.  Some additional information regarding this thread:  The PCM tank was from Phase Change Material Products Limited, a company based in Yaxley, United Kingdom, not China.  Initially, the amount of phase change was lower than expected, but an added pump improved the dispersion across all the cells in the tank and increased the amount of phase change from the initial results.  I agree with Chris that since this project was built (2012-13), the industry has advanced and that there are more products available as well as other options to consider for thermal storage including water storage tanks.

For conventional water-based thermal storage, there are a few tank designers and fabricators for above grade tanks and tank internals. Goss Engineering is one I have collaborated with in the past. Chicago Bridge and Iron (now merged with McDermott) is a design-build fabricator of above ground tanks. I’ve also been involved in a below grade tank design where the tank structure was done by a conventional civil structural engineer, with the internals designed by Goss. Having seen the engineering and construction of the internals, it is honestly not so complicated (large pipe headers with saw-cut diffusion slots chopped in with a circular saw…). Peter Alspach, PE Director of Design Performance NBBJ 223 Yale Avenue North SEATTLE WA 98109 Direct: 206.621.2279 Mobile: 206.816.4902 www.nbbj.com / @nbbjdesign / http://meanstheworld.co Fro