FSEC Research Presented at 2014 ACEEE Summer Study on Energy Efficiency in Buildings

August 20th, 2014

FSEC researchers presented their research findings at the 2014 ACEEE Summer Study on Energy Efficiency in Buildings in Pacific Grove, CA on August 17-22, 2014. Check out their research publications:

3D view of exhaust fan

One study met ASHRAE 62.2 levels of ventilation with a high quality, quiet exhaust fan rated for continuous runtime, with an insulated exhaust duct to limit condensation.

What are the implications of mechanically introducing humid outside air into residential buildings, compared to the indoor air quality benefits?

Take a look at the results of a study of 10 homes in Gainesville, FL that includes impact on energy use, comfort, durability, and cost.


In another study of mechanical ventilation in homes, two lab homes, constructed to represent characteristics of typical existing Florida homes, were monitored. They were configured with tight and leaky building envelopes, and with and without mechanical ventilation. Simulation results of high performance new homes with mechanical ventilation, and typical older homes with and without air tightening and mechanical ventilation, were also presented.

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FPL Offers 50%* Discount Toward Training at Florida Solar Energy Center

June 10th, 2014

In an effort to make professional training for the installation of solar water heating (SWH) and photovoltaic (PV) solar systems more accessible to licensed electrical, plumbing, and solar contractors and their employees, Florida Power & Light Company is offering a discount for training classes conducted by the Florida Solar Energy Center (FSEC) in Cocoa, Florida.

How it works:
1. Visit www.FPL.com/trainingdiscount and fill out the eligibility form
2. FPL will verify eligibility and send an email with a promotion code
for the discount
3. Visit the FSEC website to register for the course(s) and enter the promotion code to receive the discounted course pricing

An essential part of the workshops are the installation instruction sessions. These concentrate on proper system installation and include roof mounting and sealing of both photovoltaic modules and solar water heating collectors on various Florida roof types. This includes a basic understanding of the design and installation methods used to ensure that modules and collectors are securely mounted. Identification of the various hurricane wind regions in Florida and the maximum wind speed requirements solar panels must withstand in each region.

Students attending the FSEC workshops will receive an “FSEC Certificate of Course Completion” once they successfully complete the course(s). Florida Construction Industry Licensing Board and Electrical Industry Licensing Board continuing education credits are also available for those taking the Photovoltaic System Workshop (18 credits). These are credits that licensed contractors need for renewal of their license.

* In order to be eligible for the discount, class participants must work for a licensed electrical, plumbing or solar contractor doing business in FPL’s service area, provide their valid contractor license number and agree to the terms releasing FPL from any liability. FPL discount available for all Solar Water Heating Systems and Photovoltaic Systems Workshops offered through 2014.


May 8th, 2014

COCOA, May 3, 2014—Despite discouraging weather forecasts, more than 450 students traveled from as far away as Key West and Tallahassee to compete in the EnergyWhiz Olympics at UCF’s Florida Solar Energy Center today. The sun didn’t shine, but the competitions went on…well, at least part of them.

In the Bright House Solar Energy Cookoff, ovens were judged only on design. The morning started out cloudy and oven temperatures only reached 100 degrees before the heavy rains appeared. Also impacted by the rain was the Junior Solar Sprint (JSS), a model solar car race.

“We were hopeful the rain would go around us, but not this year. It’s the first time in 14 years that we couldn’t hold the Junior Solar Sprint,” said Susan Schleith, K-12 education coordinator at FSEC.

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April 24th, 2014

Energized Students Demonstrate Skills at the EnergyWhiz Olympics on the Space Coast


The 12th annual EnergyWhiz Olympics will bring together students from across Florida, converging in Cocoa, to showcase their renewable energy projects. Student teams will race solar cars, demonstrate creative solar and hydrogen projects, present solar oven designs and cooking skills, and reveal energy-efficient pet homes, all highlighting their energy knowledge and skills in Science, Technology, Engineering, Art and Math (STEAM).

NEW:  An Electric Vehicle Ride & Drive—which will include a Nissan Leaf—will be available for adults to experience.

The public is invited to attend free of charge.

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DOT Selects UCF to Develop ‘Smart Grid’ for Plug-in Electric Vehicles

October 24th, 2013

By Sherri Shields

COCOA, October 24, 2013 – As interest in electric vehicles continues to keep the automotive industry charged, the nation is strategizing how to best integrate plug-in vehicles with its electrical grid and highways. Now, with funding from the U.S. Department of Transportation for the creation of the first transportation center with a focus on electric vehicles, the University of Central Florida will help chart that course in Florida.

Photograph of electric vehicle only parking

Dedicated parking and charging stations for electric vehicles might soon become commonplace.

The Electric Vehicle Transportation Center operated by UCF’s Florida Solar Energy Center is a newly funded, four-year, $9 million research effort to help create the nation’s electric-vehicle transportation network. Research conducted by the center will help transportation planners prepare our nation’s highways for the influx of plug-in electric vehicles (PEV), while developing “smart grid” applications that will strengthen the ability of our electric system to accommodate the power demands of electric vehicles. PEVs need a reliable, predictable network of charging stations to allow them to travel long distances without the fear of “running out of fuel.” Workplace charging, community charging, and highway fast-charging systems are in development. A new PEV transportation network designed in conjunction with the modernization of our electric grid system will result in a sustainable highway and energy network.

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In the Field with Neil: RESNET Chapter 8 Blower Door Numbers

August 26th, 2013

In July 2013 – Florida changed; some say for the better – others not so much so. Never the less, change has occurred. For raters working in Florida, it means that we now have the option in how we perform blower door testing. In the past, it was a requirement that for a registered rating – a multipoint test was needed. Now we can do a single point. (For me personally, I like the multipoint test. All the hard work is done; I only need to gather a few building pressures and corresponding flows. I get more info about the building enclosure. But this is for another blurb.)

So what does RESNET chapter 8 say…


There are three acceptable airtightness test procedures:

802.1.1 Single-point test: Measuring air leakage one time at a single pressure difference as described in section 802.5

802.1.2 Multi-point test: Measuring air leakage at multiple induced pressures differences as described in section 802.6

802.1.3 Repeated single-point test: The test is similar to the single point test, but the test is done multiple times for improved accuracy and estimating uncertainty as described in section 802.7


What are the highlights of each test process?

(Note that the house setup is identical no matter which test procedure you use – the difference is in the pressures and flows taken from the blower door.)

Let’s look at 802.5 Single-point test.

  1. Determine the baseline range – Fan sealed, record 5 different pressures (10 second average minimum) of house wrt outside. Find the difference between the highest and lowest values – This sets the Level of Accuracy.
  2. Determine the Pre-test baseline pressure – Average these 5 readings just taken may be used (or use baseline feature of meter – 10 second min).
  3. Determine the unadjusted building pressure and flow at 50 pascals – the building pressure to the nearest 0.1 pascal and the flow to the nearest cfm. Also record inside/outside temperatures, fan/meter models/serial numbers, fan configuration and type of test (pressurize/depressurize).
  4. Perform calculations to determine corrected CFM50. See the RESNET Standard section 802.5.9 for that process. Or my suggestion is to download the FREE EnergyConservatory Tectite 4.0 (wifi) software. You can select this test type and just input your numbers and out pops the result and you can save it for later viewing – like when the QA person comes around and asks to see your files…just saying.
  5. If you are using EnergyGauge USA (of course), enter the building pressure and corrected fan flow as shown. Click on Calculate/Post and it will do the calculations needed.


Now let’s look at 802.6 Multi-point test.

  1. Determine the Pre-test baseline pressure – Measure the house wrt outside using the 10 second average minimum (or use baseline feature of meter – 10 second min). Fan sealed during this step.
  2. Determine the unadjusted building pressures and flows– Take and record a minimum of 7 additional unadjusted building pressure and nominal fan flow measurements at target induced pressures which are approximately equally-spaced between 60 Pa (or the highest achievable induced building pressure) and 15 Pa. The building pressures to the nearest 0.1 pascal and the flows to the nearest cfm. Also record inside/outside temperatures, fan/meter models/serial numbers, fan configuration and type of test (pressurize/depressurize).
  3. Determine the Post-test baseline pressure – Measure the house wrt outside using the 10 second average minimum (or use baseline feature of meter – 10 second min). Fan sealed during this step
  4. Complete steps #4 & #5 above.
  • Note: the current version of EnergyGauge USA doesn’t do the required adjustments to the as measured building pressures and flows – therefore download the FREE EnergyConservatory Tectite 4.0 (wifi) software; it will perform all the calculations needed.

Lastly look at 802.7 Repeated single-point test.

  1. Determine the Pre-test baseline pressure – Average these 5 readings just taken may be used (or use baseline feature of meter – 10 second min).
  2. Determine the unadjusted building pressure and flow at 50 pascals – the building pressure to the nearest 0.1 pascal and the flow to the nearest cfm. Also record inside/outside temperatures, fan/meter models/serial numbers, fan configuration and type of test (pressurize/depressurize).
  3. Repeat steps #1 & #2 a minimum of 5 times.
  4. Calculate the Average Nominal CFM50 by summing the individual nominal CFM50 readings and dividing by the number of readings.
  5. Perform calculations to determine corrected CFM50. See the RESNET Standard section 802.7.9 for that process or use the FREE EnergyConservatory Tectite 4.0 (wifi) software. If you are using EnergyGauge USA, enter the building pressure and corrected fan flow. Click on Calculate/Post and it will do the calculations needed.

Tei Explains It: August Rater Updates

August 26th, 2013

Continue to stay up-to-date on the latest rater news and announcements.

NATE/RESNET HVAC Performance Verifier Exam

NATE is beta testing the NATE/RESNET HVAC Performance Verifier exam in July and August, 2013. Beta testing is done to make sure we have the right questions, we have the right approach and to receive industry input into the development. The beta exam is now available for HERS raters to take.

Several weeks ago, HERS raters were sent an invitation to take the NATE/RESNET exam at FSEC. The response on the registration page was great however the majority of those that signed up did not show up for the exam. In the future, if you will not be attending a class, test, etc that you have signed up in the FSEC store, please drop us an e-mail or call to cancel. This has been pretty disappointing since there was no cost for this exam.

The next exam is available on August 30 starting at 9:00 AM at FSEC. Registration is available at https://secure.fsec.ucf.edu/fsecstore/do/product/BldgExams/NATEexam

Rater Agreements

The EnergyGauge Office has been working on a HERS Rater packet. This packet should be going out in the early fall. This packet will contain specifics in what we expect from raters and what you can expect from the EnergyGauge Office. Please look for it in your mailboxes. You will have 30 days to execute the agreement after receipt.

Quality Assurance

Quality Assurance for the 2013 year is in full swing. I will be contacting you via e-mail and/or phone to schedule dates and times to get this done. I have complete confidence that you will cooperate fully with this process. Unfortunately, even if you do one home, I will have to get into that home. RESNET is enforcing this and if you do not respond the only choice that I have will be to suspend you from registering ratings. We will be adopting a formal policy regarding this situation and others concerning QA and will be included in your rater packet which should be going out to all HERS raters in the early fall.

Combustion Classes

You will have until January 1, 2015 to complete the combustion portion of your individual certifications. I know we have cancelled classes in the past because the exam was not ready. The exam is now ready and the fall class scheduled for November 19-21 will be held. Register at https://secure.fsec.ucf.edu/fsecstore/do/product/BLDG/Combust

In The Field With Neil: RESNET-Approved Airflow Measurement Techniques

June 17th, 2013

Chapter 8, section 804 of the RESNET Standard provides us with an onsite procedure for measuring the airflow of ventilation systems. These procedures treat the air flows into a grille and out of a register measured separately. There are 3 RESNET-approved test processes used to determine airflow: 1) powered flow hood, 2) air flow resistance and 3) timed bag inflation. Each method, as most things in life, has positives and negatives.


Powered Flow Hood


The powered flow hood method is the most accurate, but also the most expensive. The powered flow hood differs from a conventional flow hood in that there is a fan which assists air movement through the flow hood to prevent a pressure differential at the register or grill created by the flow hood. The most common is the Energy Conservatory FlowBlaster® which works with your existing Duct Blaster Fan and DG-700 Pressure and Flow Gauge. The fan is powered by a combination fan speed controller and rechargeable Lithium-Ion battery. This method may be used on either exhaust or supply systems.


Air Flow Resistance


The air flow resistance method is probably the most common and can only be used on exhaust systems (air entering grill).  This method determines the air flow by measuring a pressure difference across a known hole size.  The air flow (in cfm) is equal to the hole size (in square inches) times 1.07 times the square root of the pressure difference (in pascals).  (Yes we are mixing units, but the 1.07 factor takes care of the conversions.)  This device will give the best results when the pressure difference is less than 8 pascals – largely because the exhaust fan speed will be reduced with greater pressures.  There is a commercially available “box” or flow meter again from the Energy Conservatory or you can easily create your own.  (If interested in creating your own – drop me a line and I will send you the directions.)



Timed Bag Inflation

The timed bag inflation method is the least expensive of all.  It can only be used on supply systems.  As the name implies, a bag (typical a garbage bag) of known volume is inflated by the supply air.  The time required to fully inflate the bag is measured with a stopwatch.  This method takes a bit of practice to get repeatable results, but is rather simple to do.  As the standard indicates, bag volume and thickness play into the accuracy of the results – so a trial and error approach is needed.  Aim for a fill time of 2 to 20 seconds – the longer fill time will be easier to do, but may require a fairly large bag depending on the amount of airflow.  The airflow is easily calculated by multiplying the bag volume (in gallons) by 8 and dividing by the time (in seconds) required to fill it.  The Canada Mortgage and Housing Corporation has a nice write up on the method along with a table to convert to airflow.


These three procedures are the only RESNET-approved methods for measuring airflow in either whole house or spot ventilation systems.  (Well, there is one exception – if an ERV/HRV manufacturer has ports installed on their device for the purpose of measuring airflow; that may be used when following their directions.)

So go measure and have fun out there…

UCF Professor Wins Research Incentive Award

May 21st, 2013

By Danielle Daniel

Congratulations to Dr. Nahid Mohajeri, who received a University of Central Florida (UCF) 2012-2013 Research Incentive Award in recognition of her exceptional research efforts. Dr. Mohajeri is an associate research professor at UCF’s Florida Solar Energy Center (FSEC).

Professor Nahid Mohajeri

Each year, UCF recognizes faculty members and research staff who have an outstanding research, scholarly, or creative record that advances the body of knowledge in their field.

“I did not get here all by myself,” states Mohajeri, in response to receiving the award. “I have been helped, guided, and given opportunities by many people during my tenure at FSEC that I will forever be grateful,” she explains.

Dr. Mohajeri’s recent contributions to the research community include the development of highly durable proton exchange composite membranes for fuel cells, a technology based on the addition of cerium oxide nanoparticles to the membrane. When tested, this innovative approach   improved fuel cells’ membrane stability and performance, resulting in a sevenfold decrease in the open circuit voltage decay rate compared to the baseline membrane. Membranes are at the heart of hydrogen fuel cell technology, and by increasing their durability, goals for developing fuel cells as a reliable, alternate energy source are attainable.

Other accomplishments include the creation of a chemochromic hydrogen leak detection tool known as “Smart Paint,” which was used by NASA to visually detect colorless and odorless hydrogen leaks. Furthermore, Dr. Mohajeri discovered a new class of catalysts for the hydrolytic cleavage of ammonia borane, one of the promising classes of chemical hydrides for hydrogen storage. She has authored and co-authored more than 30 scientific publications and has received seven patents (awarded and applied). In addition to her research endeavors, Dr. Mohajeri says she considers it an honor as a professor to educate and mentor “the next generation of scientists.”

Regarding future contributions to energy research, Dr. Mohajeri’s diverse background has enabled her to work in various energy research areas. However, one focus in particular has garnered her attention: “The area of soft materials, such as polymers, for energy storage or energy efficiency technologies holds a special place in my overall interests in energy research,” she states.

Solar Electric System Provides Emergency Power and Teaching Tool for Haines City High School

May 17th, 2013

By Sherri Shields

COCOA, May 17, 2013 – Students, teachers and the community of Haines City will reap multiple benefits from the new 10,000-watt photovoltaic (PV) system at Haines City High School. The PV system with battery backup will provide emergency power during an outage, reduce daily electricity costs to the school, and serve as a learning resource.

Haines City High School celebrates new 10,000 watt solar electric system with ribbon cutting and solar workshop for teachers. (From left to right, Mike Vergona, Vergona-Bowersox Electric Inc.; Caroline Weaver, Polk County Energy Manager; Peter DeNapoli, Solar World Eastern Region Manager; Patricia Butler, Haines City High School Principal; Stephen Scheloske, Haines City High School Assistant Principal ; Sherri Shields, FSEC Communications; Susan Schleith, FSEC SunSmart E-Shelter Program Manager. Photo Credit: Nick Waters

The Florida Solar Energy Center (FSEC), a research institute of the University of Central Florida (UCF), held a dedication ceremony and solar workshop for teachers to celebrate the installation of the 42-panel PV system at Haines City High School on Wednesday, May 15th. Coordinated by UCF’s Florida Solar Energy Center, the system, valued at $85,000, is the 85th PV system installed through the SunSmart Schools Emergency Shelter Program.

In conjunction with the dedication, a professional development workshop gave teachers from Haines City High School, Poinciana Academy of Fine Arts in Osceola County, Bloomingdale High School in Hillsborough County and Montessori World School in Orange County an opportunity to experience hands-on solar activities, showcasing the FSEC curriculum and a companion renewable energy kit. More than 250 teachers have participated in similar workshops, impacting more than 50,000 students statewide.

Teachers participate in a hands-on professional development solar workshop (From left to right: Broderic Ogzewalla, Robin Anderson, and Britton Bouey from Haines City High School, and Raf Baksh from Bloomingdale High School). Photo Credit: Nick Waters

Not only does the PV system reduce electricity costs by up to $1,500 a year and serve as a generator when a power outage occurs, the system also reports performance data to FSEC; the data will be available on energywhiz.com in June. This site will allow students and teachers to analyze PV system performance data to better understand how the technology works. “We hope we never have to use the system as a generator, and we’re excited about the hand-on learning application for our students and teachers. Being able to see the real-time data that our system produces will be a tremendous resource,” said Stephen Scheloske, assistant principal at Haines City High School. Read the rest of this entry »