Terranova Ranch in Fresno, Calif., grows more than 25 different crops on 6,000 acres. The company, which started in 1981, has focused its attention lately on methods that keep its soil, water, and air quality as healthy and sustainable as possible.
The design for Terranova Ranch’s new office pavilion is the first net-zero carbon and net positive energy project by Paul Halajian Architects (PHA), and the client’s design choices were informed by the use of cove.tool’s web-based building performance app.
Terranova Ranch’s aimed for a 100 percent reduction in operational carbon emissions, and the architect provided several options toward meeting or exceeding that goal. (Cove.tool shared some of the details of this case study with BD+C.)
GOING BEYOND CODE MINIMUMS
Initially, the energy model for the 5,800-sf office building was designed to follow code minimum baseline assumptions from California’s Title 24, version 2019, which offered a carbon reduction of 12 percent. PHA’s project architect conducted several analyses on possible improvements to reduce the overall Energy Use Intensity (EUI), which in this model was 42.52 kBtu/sf/year.
These analyses measured the impacts of the building’s HVAC, lighting, equipment, hot water, fans, and pumps. The first proposed design change was an envelope upgrade, from the mandatory minimum of R-19 to R-30 by adding two inches of Expanded Polystyrene (EPS) foam board to the exterior walls; and three inches of foam board insulation to the roof, which increased its R-value from 30 to 41. These changes would increase the building’s overall carbon reduction in base design to 20 percent and reduce the EUI to 38.
GLAZING’S BENEFITS DIDN’T PENCIL
The second option the architect investigated for Terranova Ranch combined the proposed envelope upgrade with improved glazing using Solarban 72 Acuity glass or Starphire glass with a u-value of 0.28 and solar heat coefficient of 0.28. (The baseline requirement is Solarban 60.) However, using cove.tool analysis tool, the architect determined that the whole-building EUI would have only reduced to 37, and only increased the carbon reduction by 2 percent from the first option. There were also cost considerations that made the glazing option less favorable.
The third upgrade option explored introduced 2,200 sf of monocrystalline solar panels, angled at a 15-degree incline atop a shaded parking structure. This option would reduce the building’s carbon emissions by 84 percent (from option No. 2’s 22 percent) and decrease the EUI to 7 form 37. Terranova Ranch was enthusiastic about this option.
![Option four included heat recovery](/sites/default/files/inline-images/2037_Energy%20Analysis%20Report_PHA_20211117_Part8.jpg)
A fourth alternative explored introducing heat recovery by adding an energy recovery ventilator in the ceiling. This option allowed for a carbon reduction of 103 percent and an EUI score of negative 1.5. The client agreed to move forward in the building’s design with each option except the glazing upgrade.
SUNLIGHT EXPOSURE WILL REDUCE BUILDING’S LIGHTING NEEDS
Along with the energy study, the architect conducted other analyses. Using cove.tool software, the architect observed that 85 percent of the office building’s interior would have access to “quality exterior views,” which in turn would earn the product LEED Views Credit. A daylight analysis of the architect’s design also showed that the building would be exposed to up to 12 hours of sunlight per day, reducing the design’s artificial lighting requirement.
![Outdoor exposure map for new office](/sites/default/files/inline-images/6.%20PHA_Views.jpg)
While most clients might not be as sustainably inclined as Terranova Ranch, conducting data-driven analyses can be fruitful as a common practice that allows the design team and client to delve into different design scenarios to achieve an intended performance goal.
Construction on the office pavilion was scheduled to begin in late spring. The architect and client did not disclose construction costs.
Related Stories
| Aug 11, 2010
LEED 2009 cites FloorScore Certification as indicator of indoor air quality
The U.S. Green Building Council (USGBC) has cited FloorScore® certified flooring products as eligible for credits under the new LEED 2009 Version 3 guidelines. Reflecting the inclusion of FloorScore, the new LEED IEQ Credit 4.3 for Low-Emitting Materials has been expanded from “Carpet Systems” to “Flooring Systems” to include hard surface flooring.
| Aug 11, 2010
Study explains the financial value of green commercial buildings
Green building may be booming, especially in the Northwest, but the claims made for high-performance buildings have been slow to gain traction in the financial community. Appraisers, lenders, investors and brokers have found it difficult to confirm the value of high-performance green features and related savings. A new study of office buildings identifies how high-performance green features and systems can increase the value of commercial buildings.
| Aug 11, 2010
Architecture Billings Index flat in May, according to AIA
After a slight decline in April, the Architecture Billings Index was up a tenth of a point to 42.9 in May. As a leading economic indicator of construction activity, the ABI reflects the approximate nine to twelve month lag time between architecture billings and construction spending. Any score above 50 indicates an increase in billings.
| Aug 11, 2010
Free-span solar energy system installed at REM Eyewear headquarters
The first cable-suspended free-span solar energy system was completed today over the REM Eyewear headquarters parking lot in Sun Valley, Calif. The patented, cable-supported photovoltaic system created by P4P Energy is expected to generate 40,877 kilowatt-hours of renewable electricity per year, enough to power five to six single family homes and to prevent 1.5 million pounds of carbon from being released into the atmosphere.
| Aug 11, 2010
Construction employment declined in 333 of 352 metro areas in June
Construction employment declined in all but 19 communities nationwide this June as compared to June-2008, according to a new analysis of metropolitan-area employment data released today by the Associated General Contractors of America. The analysis shows that few places in America have been spared the widespread downturn in construction employment over the past year.
| Aug 11, 2010
Jacobs, Hensel Phelps among the nation's 50 largest design-build contractors
A ranking of the Top 50 Design-Build Contractors based on Building Design+Construction's 2009 Giants 300 survey. For more Giants 300 rankings, visit http://www.BDCnetwork.com/Giants
| Aug 11, 2010
CHPS debuts high-performance building products database
The Collaborative for High Performance Schools (CHPS) made a new tool available to product manufacturers to help customers identify building products that contribute to sustainable, healthy, built environments. The tool is an online, searchable database where manufacturers can list products that have met certain environmental or health standards ranging from recycled content to materials that contribute to improved indoor air quality.
| Aug 11, 2010
U.S. Green Building Council's new headquarters earns LEED Platinum
The U.S. Green Building Council (USGBC) is proud to announce the Platinum certification of its new Washington, D.C. headquarters – making it the first project to certify under the latest version of the LEED green building rating system.