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What do you get when you challenge nine interdisciplinary teams to design a net zero (or below) 50,000 ft2, 3-story Outpatient Health Care facility in Omaha, Nebraska? You get ASHRAE’s Lowdown Showdown, an energy modeling competition that showcases the talent and innovation of those in our industry using building performance analysis software.
Last year, Team IES won Best Energy Use Results and we were delighted that the winning streak continued after the team were awarded Best Workflow at SimBuild 2016 in Salt Lake City on August 11th.
This year’s IES team – going under the name Insane Energy Savers – consisted of the following members: Kent Beason, Joanne Choi, Cory Duggin, Alexandra Gramling, Ken Griffin, Amy Jarvis, Shona O’Dea, Igor Seryapin, Irina Susorova, Tristan Truyens, Brian Tysoe, Scott West and Xiangjin Yang.
Our design started by modifying the massing and program to be as climate responsive as possible, while still maintaining the core mission of an outpatient surgery center. Any non-critical spaces were migrated to the second and third floors where a common atrium was added in lieu of the circulation program areas. Exam rooms and office spaces were placed along the perimeter to allow cross ventilation from them through the atrium. Based on wind roses for the shoulder seasons, when natural ventilation is most viable, the building was rotated for the south façade to be in line with the predominant south eastern wind.
Stair stepping the south façade allows the building to self-shade for the entire cooling season and allows for passive heating in the winter as well as passive reheating of air-change dominated spaces on the first floor. Since Omaha has a significant heating season, the R-value of the walls, roof and glazing were optimized to reduce heat loss.
The air change constraints in the first floor program caused us to consider it separately. A separate dedicated outside air system (DOAS) is used for the critical spaces coupled with earth tubes to precool and preheat the required ventilation air. The non-critical areas use another DOAS with a south facing vertically mounted transpired solar collector for preheating since the windows will be open for cross ventilation during much of the cooling season. All spaces and both DOAS use a geothermal, water-cooled VRV system for their cooling and heating.
The tilted roof of the atrium was designed to hold photovoltaic panels with a 19.6% efficiency. Wind turbines were also used to produce the remainder of the energy required to get net zero.
Take a look at the poster below for more info on the project’s energy saving strategies.
An ‘Insane’ Effort
In my role as team mentor, it was awesome to see first-hand how our talented team used the Virtual Environment to complete this challenge. A lot of work was put in and it paid off when they picked up their award for Best Workflow.
It was a great effort by all involved – not just the insane ones – and it’s fantastic how each team came together to demonstrate how energy modeling tools can be used to make such a positive impact on our built environment. Bring on next year’s challenge!
Click here to see view the Insane Energy Savers’ Lowdown Showdown presentation slides.
You may remember we blogged back in August about our participation in the ASHRAE LowDown Showdown competition. Well, we have some great news… Team IES won the Best Energy Use Results category! Liam Buckley coached the winning team, fighting off competition from seven other practitioner teams, representing software-specific tools from: Autodesk, Carrier, DesignBuilder, eQUEST, EnergyPlus, Sefaira, and Trane. We asked Liam to tell us more about the winning entry and the winning team…
Our brief was to design a three-story; 53,600-square-foot office building that included a number of specific design challenges, but also encouraged design creativity. Projects were judged on energy efficiency, design creativity, workflow innovation, teamwork and collaboration.
Obviously, the team decided to make the challenge even more challenging by locating the building in downtown Boulder, where the climate experiences vast and extreme variations including annual external conditions ranging from (-4° F to 93°F); (6% -100% Relative Humidity) and commonly occurring daytime-to-night-time temperature swings of 35°F.
The team considered 150+ Energy Conservation Measures (ECMs) and eventually chose 25-30 strategically sequenced ECMs, which included daylight harvesting controls; natural ventilation with exposed thermal mass and automated night-purge control; an air-to-water heat pump; energy-star equipment; plug load schedules from metered ZNE evangelists; fixed and dynamic solar shading; airside heat-recovery wheel; IT server virtualization; radiant floors for improved thermal comfort; an optimized electric lighting design; a high-performance envelope with heat-mirror glazing and insulated panels. Finally, the integral ECM of the building showcased a passive negatively-airflow-integrated atrium, which considered all climatic eventualities.
To compliment the solar hot-water heating system, which was coupled with electricity-generating PV panels, additional explicit onsite renewable energy technologies included 5 Vertical Axis Wind Turbines. These were further optimized by the building architecture.
Our team wanted to ensure that the design would not only meet net-zero standards for next year, but that 50 years down the line, would still be operating at net-zero energy. To ensure this, we morphed the TMY15 weather data 50 years into the future (to 2064) and planned for the addition of two building-integrated evaporative down-draft cool towers that assist with cooling, which would keep the building operating at zero net energy despite higher cooling loads.
I was thrilled that our team won this award for Best Energy Use Results. The team worked really hard; although the IESVE is a powerful software suite with vast capabilities, the tools are only as good as the people using them, and we had an incredible team using them. They deserved it. It was a real pleasure working with such a talented group of people.
The team members were: Anna Osborne (Integral Group), Ben Brannon (Arup), Shona O’Dea (DLR Group), Megan Gunther (Affiliated Engineers, Inc.), Cory Duggin (TLC Engineering for Architecture), Greg Romanczyk (exp) and Scott West (HKS Inc.).
Our team has created a video presentation of the winning design which can be viewed at https://youtu.be/7V5LktxK5ig.
On the build up to this year’s ASHRAE Energy Modeling conference in Atlanta, ASHRAE have launched the new Lowdown Showdown modeling challenge. ASHRAE have put together a selection of teams consisting of engineers, architects, designers and energy modelers, who will be coached by software vendors including IES, as they compete to design and model a net-zero energy building.
The challenge, which started in June, will run for 3 months on the lead up to the conference that kicks off at the end of September. Each team has been given a baseline building, which they must then work on together to create a design proposal that demonstrates net zero energy performance.
The teams will present their final design on October 1st at the ASHRAE Energy Modeling conference. The “LowDown Showdown” projects will be voted on by the conference attendees and will be judged on Energy Use Results, Creativity, Innovative Workflow and Teamwork.
I’m very excited to be working with the group that ASHRAE have assigned to the IES team. ASHRAE have given us a tricky challenge but I’m confident in the talent on the team, and that they’ll overcome and surpass expectations. Our team consists of the following members:
Ben Brannon (Arup)
Anna Osborne (Integral Group)
Greg Romanczyk (exp)
Cory Duggin (TLC Engineering for Architecture)
Shona O’Dea (DLR Group)
Megan Gunther (Affiliated Engineers, Inc.)
Scott West (Jacobs)
Andrea Costa (ACE Energy Concepts)
Even though the team is spread across a massive region, I’ve been lucky enough to meet them all before. On a personal level, they are all really wonderful people and it’s a pleasure to work with them. I’m looking forward to seeing their presentation. If you are too, we’ll see you in Atlanta on October 1st!
The conference is set to be a busy week for IES. Our team will be exhibiting our latest VE solutions and we’re hosting two pre show training workshops – HVAC Loads Sizing and Energy Modeling (http://ow.ly/QNYlk) and Advanced HVAC Modeling (http://ow.ly/QNYq3).
It doesn’t stop there. My IES colleagues Nathan and Megan will also be taking part in the following presentations, so try and check them out if you’re coming to Atlanta…
IES are also hosting a welcome reception for our customers on the Wednesday evening, September 30th – details coming soon.