Building America

Smart Vent Tech Improves IAQ and Saves Money, Energy

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By Jennifer Josey
National Renewable Energy Laboratory
February 22, 2018

How many times have you completed a system upgrade for a device only to find that it’s glitchy? No one wants to “upgrade” to downgrade, and we don’t like being inconvenienced as things get “smarter.” This is just as true for our homes. Reducing energy consumption (thereby saving money) is a key driver for smart, integrated tech (think smart thermostats); however, adoption is lower if an upgrade risks compromising resident comfort.

Whole-house, smart ventilation is one such up-and-coming “smart” technology. But before it takes off, there are a couple of hurdles to jump: integration with standard heating and cooling systems, and proving the risks are limited and the benefits are many. Researchers with the University of Central Florida’s Florida Solar Energy Center® (FSEC®), in partnership with Washington State University, are tackling smart ventilation systems head on.

UCF/FSEC researchers Chuck Withers and Dave Chasar installing a mechanical ventilation control unit on a flexible duct.
UCF/FSEC researchers Chuck Withers and Dave Chasar installing a fan on a flexible duct to test an energy-efficient mechanical ventilation control design.

In a first-of-its-kind report, “Field and Laboratory Testing of Approaches to Smart Whole-House Mechanical Ventilation Control,” FSEC documented research on lab and field testing of smart ventilation control (SVC) systems. The report explains that whole-house mechanical ventilation is a critical component to a comprehensive indoor air quality (IAQ) strategy. In addition, these systems can help the residential sector more reliably design, install, and operate mechanical ventilation systems to achieve best-practice IAQ while saving energy and improving comfort, moisture, and peak load impacts.

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Energy Department Funds UCF Research in Housing Innovations

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By Barb Abney
May 14, 2015

Photo of Eric Martin in lab, leaning on test wall structure.
Eric Martin at FSEC’s Flexible Residential Testing Facility. Credit: Nicholas Waters

 

The University of Central Florida is the only university-led team in the nation to receive part of a $4 million investment by the Energy Department to develop and demonstrate energy efficient methods of keeping homes cool in the summer and warm in winter.

The Energy Department’s Building America program is working with industry partners to develop cutting-edge innovations and resources that will lead to 50 percent savings in new homes by 2025 and 40 percent savings in existing homes by 2030.

The Building America Partnership for Improved Residential Construction, led by UCF’s Florida Solar Energy Center (FSEC), will receive nearly $1 million for research focused on optimal comfort systems for heating, cooling, air distribution, and humidity control. The project will also study high performance ventilation systems and indoor air quality strategies.

“This research will help us develop integrated approaches to making homes more energy efficient while keeping them comfortable, healthy and durable,” said Eric Martin, the project’s lead researcher and program director in FSEC’s Building Research Division.

Much of the work focuses on cooling applications in hot and humid climates like Florida’s. Work on keeping homes warm in the winter will be conducted by partners at Washington State University.

Experiments will be conducted in laboratory homes located at FSEC, as well as in occupied homes.

“To ensure near-term market penetration, we are working with several industry partners including production home builders and product manufacturers,” Martin said. “But we are also focused on influencing codes and standards, which can result in a significant market impact for years to come.”

A major focus of the Building America program is reducing home heating and cooling because combined they represent the highest single energy use for U.S. homeowners or 40 percent of a home’s energy consumption. In 2014, U.S. homeowners spent $70 billion to heat their homes and $24 billion to cool them. Improving the energy efficiency of home heating and cooling systems and building envelopes including roof, walls and windows is estimated to potentially reduce space conditioning energy consumption by as much as 70 percent.

Over the past 20 years FSEC has led three Building America Industry Partnerships: the Energy Efficient Industrialized Housing Partnership, the Building America Industrialized Housing Partnership and the Building America Partnership for Improved Residential Construction.

Subrato Chandra Remembered

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Subrato Chandra, Ph.D., retired project manager for the Building America Industrialized Housing Partnership (BAIHP) and one of the pioneers of the building research division of the Florida Solar Energy Center, died Jan. 12 following complications from surgery.

A pioneer of buildings research at FSEC, Subrato Chandra, died Jan. 12, 2012 due to complications from surgery.
Subrato Chandra, a pioneer of buildings research at FSEC.

Subrato, who worked for FSEC for 34 years before retiring in 2010, was passionate about integrating energy efficiency into home design and, long before most people had ever heard the term photovoltaics, helped develop the concept of a PV powered house in Cape Canaveral in 1979.

One of his proudest achievements was highlighted in an email he recently sent a colleague in which several FSEC initiatives were touched upon in a listing of the most transformative homebuilding trends in the last 75 years.

Subrato’s compassion can be seen in the types of projects he championed:   As director of FSEC’s research and development division in 1995 he helped the Environmental Protection Agency launch the Energy Star Homes project that has become the most widely accepted energy-efficient green homes projects in the country.  The Building America project he led still works directly with Habitat for Humanity home builders throughout the country to help make housing more affordable for needy families and helps make manufactured or HUD-code homes more efficient.

Subrato led FSEC’s first major funded project in the buildings area with a $400,000 contract on passive cooling by natural ventilation received in 1981 from the Department of Energy.  During his career at UCF he was involved in $14 million of funded projects. In addition to his work at FSEC, Subrato served as a faculty member in the Department of Civil, Environmental and Construction Engineering in the College of Engineering and Computer Science.

Subrato was able to succeed because he always championed the personal relationship over the pure technical work. He communicated equally well with a housing subcontractor and a renowned scientist. And in so doing he was able to have a number of happy employees and help funding agencies achieve their goals. His loss will be felt nationwide in the building research community.

“He was a great teacher, a respected scientist, and a classy gentleman, ” said Craig V. Muccio, a colleague from Florida Power and Light who first met Subrato in a solar engineering class Subrato was teaching in 1980.

Most recently Subrato was working with the Pacific Northwest National Laboratory as a senior buildings engineer.

Subrato’s wife Mitra works in the Office of Research & Commercialization and he has two grown children.

New Home Sales Robust for Some Energy-Efficient Florida Builders

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It’s no surprise that in today’s ailing market, new home sales are down. What is surprising is that construction is on the rise for six Florida homebuilders.

In partnership with one of the U.S. Department of Energy’s Building America teams, led by the University of Central Florida’s Florida Solar Energy Center (FSEC), these successful homebuilders are building super energy-efficient homes. They are achieving a standard met by fewer than one of every 1,000 new homes built in Florida since 2007.

Homes consume about 35 percent of the electricity produced in the United States. Homes are also responsible for more than 20 percent of the U.S. emissions of carbon dioxide, a significant contributor to global warming. Building America’s goal is to develop cost-effective solutions that reduce the average energy use of housing by 40 to 100 percent.

The Department of Energy's EnergySmart Home Scale (E-Scale) is based off of the HERS Index.
The Department of Energy's EnergySmart Home Scale (E-Scale) is based off the HERS Index.

Similar to an automobile’s miles-per-gallon sticker, energy-efficient homes can have an energy-efficiency rating called the EnergySmart Home ScaleSM (E-Scale), which is based on the nationwide Home Energy Rating System’s HERS Index. A home with an E-Scale of zero generates as much energy as it consumes on an annual basis. While most existing homes have an E-Scale of 130 or higher, typical new homes in Florida have an E-Scale of about 90.
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Brevard Builder Takes the “Builders Challenge” – Media, public invited to tour new energy-efficient home at 2 p.m. April 25

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As homeowners cope with rising utility bills and declining income, the University of Central Florida’s Florida Solar Energy Center (FSEC) has responded to a challenge from the U.S. Department of Energy (DOE) to help produce homes 30 percent more energy efficient than typical new homes.

Additionally, these new homes will meet other stringent “quality criteria” for indoor air quality, durability and comfort set forth in DOE’s new Builders Challenge program (www.buildingamerica.gov/challenge).

The Builders Challenge is backed by two decades of research conducted by DOE’s Building America program (www.buildingamerica.gov) that proves this goal can be achieved cost-effectively all across the country. FSEC, located on the UCF Brevard campus in Cocoa, leads one of DOE’s Building America teams (www.baihp.org) and has worked with a dozen of the first builders to achieve the Builders Challenge.

FSEC researchers will co-host the unveiling of LifeStyle Homes’ first Builders Challenge home this Saturday, April 25, at 2 p.m. The public and home building community are invited to the event, which will include a tour and testing demonstrations. Look for signs in the Whispering Winds community off Dairy Road in West Melbourne. For directions, visit the LifeStyle Homes Web site: www.BuildingALifeStyle.com.

LifeStyle Homes SunSmart Energy Initiative logo
LifeStyle Homes' SunSmart models meet the DOE's Builders Challenge quality criteria.

LifeStyle Homes – based in Melbourne, Fla. – is the first Brevard County builder to achieve the Builders Challenge with its new line of SunSmartSM models. FSEC’s Building America researchers provided technical assistance and third-party certification to LifeStyle Homes, which is required by the Builders Challenge criteria.

“We are extremely proud of our collaboration with LifeStyle Homes,” says Dr. Subrato Chandra, FSEC’s Building America program director. “We look forward to many more of these high-performance Builders Challenge homes being built. We plan to work alongside LifeStyle Homes every step of the way as they work toward our mutual goal of building zero energy homes, which provide their total energy needs from the power of the sun.”

Larry Hufford, founding partner of LifeStyle Homes, echoes the thoughts of many Builders Challenge participants.

“Increasing the energy efficiency of our homes offers solid benefits to our customers,” Hufford said. “It helps them save on their monthly and annual energy bills, and it is the right thing for us to do in moving our country toward energy independence.”

For more information, contact
Neil Moyer, FSEC Building America researcher, 321-638-1409
Jake Luhn, LifeStyle Homes, 321- 727-8188 extension 303

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