NBERG Logo - State of Nebraska with NBERG and photo of team inside the state borders

December 20, 2019 – Dahdolan completes MS

N-BE³RG member Moh’d Dahdolan received his M.S. in Architectural Engineering degree today. His thesis focused on air-economizers and their faults. He was advised by David Yuill. Congratulations, Moh’d!


November 21, 2019 – UNL to partner with Berkeley Lab on fault prevalence

UNL is part of a team that received funding from the Department of Energy to study the prevalence of faults in HVAC systems within commercial buildings in the US. The three-year project is led by Dr. Jessica Granderson of Lawrence Berkeley National Laboratory (LBNL), and will be carried out by LBNL, Pacific Northwest National Laboratory, National Renewable Energy Laboratory, and UNL. The UNL team is led by David Yuill. In addition to the research institutions, several commercial FDD providers will serve as industry partners. 



August 15, 2019 – New PhD Student joins N-BE³RG

Ali Rooholghodos is the newest member of N-BE³RG. He has BS and MS degrees in Mechanical Engineering, and will pursue a Ph.D. in Architectural Engineering with David Yuill serving as his advisor. Welcome, Ali! 


August 5, 2019 - UNL Team Wins first place in ASHRAE Student Design Competition!

A team of seniors in Architectural won first place in the 2019 ASHRAE Student Design Competition for System Selection. The three students on the team were Mitch Mallett-Hiatt, Colin Miller, and Samuel Underwood. Their faculty advisor was David Yuill, and industry advisor was Rick Hiatt. The students designed a hospital in Budapest, Hungary. They will receive their awards at the ASHRAE Winter Meeting in Orlando, FL, on February 1, 2020. 


June 25, 2018 – N-BE³RG members attend ASHRAE Annual Meeting

Several members of the group attended the ASHRAE Annual meeting in Kansas City, MO. Pictured below are (L to R) Dr. Christian Bach (Oklahoma State University), Dr. Harshad Inamdar (Rheem), Dr. David Yuill (UNL), Amir Ebrahimifakhar (UNL), Yifeng Hu (UNL) and Moh’d Dahdolan (UNL).



June 22, 2019 - Yuill receives Exceptional Service Award from ASHRAE

Dr. Yuill received the Exception Service Award at the plenary session of ASHRAE’s Annual Meeting in Kansas City, MO. The award recognizes his many years of service to ASHRAE, serving on and leading technical committees, standards committees, and the Society Handbook Committee, as well as technical contributions to ASHRAE’s publications. In the photo, Dr. Yuill is with longtime friend Dr. Bill Bahnfleth, past president of ASHRAE, who received the Donald Bahnfleth Environmental Health Award. 

 Bahnfleth and Yuill


June 1, 2019 - UNL Receives Department of Energy funding to study fault prevalence

UNL has been awarded funding for a project that will include a large field study of air-conditioning systems. The project will be completed in 2022 and will include measurements at multiple US locations. DOE’s Building America program will provide most of the funding for the project, which has a budget of $949,833. The principal investigator is N-BE³RG’s David Yuill. Building America is a program that focuses on residential high performance buildings, and is part of the Building Technologies Office within the Office of Energy Efficiency and Renewable Energy at DOE.  

Building America   


March 22, 2019 – Yuill’s online article goes viral

An article in The Conversation written by David Yuill has gone viral, with over 35,000 reads in its first two days, 1500 shares on social media, and republication in over a dozen news outlets globally. The article is based on his work with Mehdi Mehrabi on condenser airside fouling, conducted for ASHRAE Research Project 1705


December 14, 2018 – Two N-BE³RG members receive Ph.D. degrees

Two of N-BE³RG’s inaugural members, who have each given several presentations to N-BE³RG, completed their doctoral degrees in Architectural Engineering. Congratulations to Dr. Alireza Behfar and Dr. Mehdi Mehrabi! Both graduates were advised by David Yuill. 



September 15, 2018 - N-BE³RG faculty to host Smart Buildings Workshop

We will host a Smart Buildings Workshop in Omaha on November 9th, 2018. A key objective of the workshop is to gather ideas on what content should be part of the Durham School's new Smart Buildings undergraduate program. It will bring together thought leaders from industry, government, and academe. Fadi Alsaleem is spearheading the effort to develop the workshop. The Workshop's website shows the speakers and other details, and includes a link to register:

August 15, 2018 - New faculty member!

Dr. Iason Konstantzos has joined the faculty of the Architectural Engineering program. Dr. Konstantzos was formerly a post-doctoral scholar at Purdue University, where he completed his Ph.D. His expertise is in building envelopes, human comfort, daylighting, and high-performance buildings. Welcome to Dr. Konstantzos! 


August 15, 2018 - New Ph.D. student

Welcome to James Butler, a new Ph.D. student in N-BE³RG! James has B.S. and Master of Architectural Engineering degrees from UNL, and two years of experience designing mechanical systems at Specialized Engineering Solutions (SES). He will be advised by Dr. Yuill.

July 17, 2018 - UNL AE students win ASHRAE student design competition

A team of four Architectural Engineering students won First Place in the ASHRAE Student Design Competition for Design Calculations! The team members are Jack Buckely, Madeline Sampsel, Austin Seagren, and Chris Wozny. The team was advised by Dr. David Yuill, P.E. and industry mentors Joe Hazel, P.E. (HDR) and Dan Karnes, P.E. (Leo A Daly). Their design was for an HVAC system serving  anew 65,450 ft² multi-use facility located north of Istanbul, Turkey. The system includes a heat recovery chiller with a geothermal ground loop. They will receive their award at the 2019 ASHRAE Winter Meeting in Atlanta. Congratulations, team! 

UNL Applied Engineering Challenge

March 27, 2018 - Yuill receives college award

Dr. Yuill received the 2018 College of Engineering Faculty Service Award, and was formally recognized by Dean Perez at a ceremony on April 5, 2018. The award recognizes service to the University, College, Durham School, and to the community.


February 13, 2018 - ASHRAE President-Elect Visit

Sheila Hayter, President Elect of ASHRAE, visited the University of Nebraska - Lincoln student chapter of ASHRAE in Omaha. Students sat down with Hayter for a fun conversation about her path to where she is now, and how participation in ASHRAE can make a positive difference on the world around us, as well as helping to form a network of friends and colleagues in the profession. Hayter also serves as a Distinguished Lecturer of ASHRAE, and gave presentations in Omaha and Lincoln on environmentally sustainable building design and operation.

UNL Applied Engineering Challenge 

January 20, 2018 - ASHRAE Chicago Winter Meeting

21 students from University of Nebraska - Lincoln Student ASHRAE attended the Winter meeting in Chicago. Sungming Yoon and Mehdi Mehrabi presented Conference Papers, and two student teams accepted their awards from the ASHRAE design competitions: 3rd Place in System Selection and 3rd Place in Applied Engineering Challenge (AEC). The AEC was sponsored by the Setty Family Foundation, and the award was presented by the Setty Family.
UNL Applied Engineering Challenge
System Selection

December 30, 2017 - New Students in N-BE³RG
Welcome to Yifeng Hu and Ainsley Liu, who have each started graduate degrees in Architectural Engineering! Ainsley is working on an M.S. with Dr. Lau, and Yifeng is working on a Ph.D. with Dr. Yuill.
September 15, 2017 - Student ASHRAE Group tours Lennox Factory 
Students from Nebraska's ASHRAE Student Group went to Marshalltown, Iowa, to tour the factory where Lennox makes their residential furnaces and air-conditioner condensing units. The factory also contains some of Lennox's performance audit and testing labs. The facility includes the original Lennox factory, and has over 1,000,000 ft² of manufacturing space. We watched heat exchangers being made, going from raw rolls of metal to finished products, and saw each stage of the process up until the unit is packaged and shipped out. The trip was organized by the student chapter president, Jonathan Ingram, and faculty advisor David Yuill. Special thanks to Miguel Gutierrez, the plant manager, and all of the staff who made us feel welcome and gave us a tour.
July 26, 2017 - Two Nebraska teams place in ASHRAE Student Design Competition
The Nebraska teams won Third Place in two categories of the 2017 ASHRAE Student Design Competition! The Applied Engineering Challenge team was Joshua Smrcina and Trevor Steinkruger. The HVAC System Selection team was Dustin Hill, Nicholas Jensen, Sean McMahon, and Kaleb Rodenshausen. The teams were advised by Dr. David Yuill and industry mentors Joe Hazel and Dan Karnes. There were high quality entries from all over the world, with a diverse set of winners. See the ASHRAE webpage for a full list of winners.
Smrcina and SteinkrugerSystem Selection
May 5, 2017 - Dr. Shihan Deng recieves degree 
Congratulations to Shihan Deng, who completed his doctoral degree! Shihan's advisor was Dr. Josephine Lau. His dissertation focused on associations between classroom indoor environmental quality and achievement/absenteeism of K-12 students, and was based on a large study of students and schools in Nebraska and Iowa.
April 13, 2017 - Yuill selected for Alumni Outstanding Teaching Award 
David Yuill received the UNO Alumni Outstanding Teaching Award for 2017. The award honors outstanding teaching in the classroom for faculty on the Omaha campus. Yuill was among nine distinguished educators honored with the award. Details, and a bio of each of the 2017 awardees can be found at the link below.
 David Yuill receives award
March 2, 2017 - Yuill wins AESLAC Award 
David Yuill is the winner of the 2017 Outstanding Faculty Award from the Architectural Engineering Student Leadership and Advisory Committee. The award is given to one faculty member in any discipline each year, and is voted upon by students in Architectural Engineering. 
 David Yuill Award

February 17, 2017 - Laboratory Complete 

The Environmental Control Laboratory, a large pair of psychrometric chambers in the Peter Kiewit Institute building, was completed today! The lab is capable of accurately controlling temperature and humidity in the two chambers, and can be used to test equipment up to 10 tons of capacity. The lab is featured in a short 360° video on Youtube. Take a look around: 
January 30, 2017 - ASHRAE in Las Vegas, NV 
Nine students in Architectural Engineering attended the ASHRAE Winter Meeting and AHR Expo in Las Vegas, NV. This was a record-breaking meeting, with about 70,000 attendees. For most of the students, it was their first time attending. It was a busy time, with lots of technical and social activities. A large part of the trip costs were covered by our generous Nebraska ASHRAE Chapter in Omaha.
December 12, 2016 - Santiwattana and Wang complete MS degrees 
Congratulations to Krittima Santiwattana and Yuchen Wang on completion of their Master of Science Degrees in Architectural Engineering!

December 4, 2016 - Two more new PhD students 

Two additional new students have started PhDs in Architectural Engineering, with a focus on building mechanical systems. Mehari Tesfay will be advised by  Dr. Fadi Alsaleem, and Amir Ebrahimi Fakhar will be advised by Dr. David Yuill. Welcome to Nebraska and N-BE³RG!
November 20, 2016 - Multiple presenters at ASHRAE 
Several members of N-BE³RG have had their presentations accepted for ASHRAE's Winter Meeting in Las Vegas, January 28-February 1, 2017. Alireza Behfar, Mehdi Mehrabi, and Sungmin Yoon will present their research, and Dr. David Yuill will be the chair of a seminar.
Also at this meeting, Durham School Associate Professor Tim Wentz will lead, in his role as President of ASHRAE. Hear Tim discuss the Las Vegas meeting in a Youtube video here.
October 16, 2016 - Alsaleem and Hasan win Mini-Accelerator Award 
Dr. Fadi Alsaleem and his graduate student Mohammad Hasan have won a mini-accelerator award from the Clean Energy Trust to develop an electrostatic MEMS oscillator for use as a low-cost humidity sensor. The competition is called JUMP. Their winning entry is described here.
August 15, 2016 - Four new PhD students 
Four new Ph.D. students have started at University of Nebraska and will be active in N-BE³RG: Moh'd Dahdolan, Mohammad Hassan, Amro Quedan and Mostafa Rafaie. Welcome to Nebraska and N-BE³RG!
August 1, 2016 - Dr. Fadi Alsaleem to join faculty of Durham School 
Fadi AlsaleemDr. Fadi Alsaleem has accepted a faculty position in the Durham School. He comes to us from Wichita State University, where he was an Assistant Professor of Mechanical Engineering. Dr. Alsaleem had several years of industry experience prior to accepting his first academic job, most recently at Emerson Climate Technologies. He has expertise in several areas, including MEMS, air-conditioner fault detection and diagnostics, thermal comfort, comfort inference, and big data. Dr. Alsaleem is very active in research, and is expected to contribute significantly to N-BE³RG.

February 3, 2016 - David Yuill is awarded 2016 ASHRAE New Investigator Award
ASHRAE has announced that the winner of the 2016 New Investigator Award is David Yuill, director of N-BE³RG. This prestigious award is given to one faculty member annually from any university worldwide who shows:
  • Competence in engineering - as evidenced by the nominees' achievements to date, particularly the quality of research and publications, teaching accomplishments, and references.
  • Potential for continued professional growth as a research engineer - as evidenced by the quality of the nominee's research plan, the currency and significance of the long-range research and the appropriateness of the research to ASHRAE and to the academic setting.
  • Potential for significant development as an educator and academic leader in the training of future engineers in ASHRAE's area of interest as evidenced by the nominee's teaching plan and the narrative statements describing the nominee's qualifications for this award with regard to the nominees development as an academic leader in an ASHRAE related interest area.

ASHRAE reports: "We received seventeen nominations for this award, all of which were outstanding. Dr. Yuill can take special pride in being judged the best of this august group." See the press release from UNL here.

January 24, 2016 - UNL student design competition teams receive awards in Orlando

 The three student teams from UNL that entered the ASHRAE Student Design Competitions were presented with their awards at the ASHRAE 2016 Winter Meeting, in Orlando, Florida. The three teams each entered a different category of the competition - HVAC Design Calculations; HVAC System Selection; and Applied Engineering Challenge - and each team was a finalist, including two 1st Place wins. The competition receives entries from all over the world, and this is the first time that any university has had three finalists in the competition. N-BE³RG director, Dr. David Yuill, was the faculty advisor for the three teams. Joe Hazel and Dan Karnes were industry advisors, and the students were: Brianna Brass, Matt Easlon, Mary Kleinsasser, Ben MacKenzie, Rachel Obenland, Kristin Hanna, Garrett Johnson, Mark Wilder, James O'Dell and Jim Butler.

Yuill and students in Orlando

December 1, 2015 - UNL Awarded Research Funding

 ASHRAE Research Project 1705-RP - Investigation of Airside Fouling on Outdoor Heat Exchangers has been awarded to Principal Investigator David Yuill, Ph.D., P.E., Assistant Professor of Architectural Engineering at UNL. The project is budgeted for $246k and includes $135k from ASHRAE. It is anticipated to be completed in November 2017. The aim of this research is to fully characterize fouling on the outdoor heat exchangers of air-cooled unitary equipment, such as rooftop units and split systems. The characterization includes analysis of the fouling material composition, its effects on equipment performance, and ways to simulate the fouling material in laboratory tests. 

September 1, 2015 - Psychrometric Chamber Construction Underway

 The faculty of N-BE³RG have commissioned a psychrometric chamber test laboratory to be built. The facility includes two large rooms that are each controlled to have specific temperature and humidity conditions, and allows air-conditioners to be tested at a range of outdoor and indoor conditions. The facility includes sensors and data acquisition equipment to monitor all parts of an air-conditioning system, such as mass flow rate, airflow rate, temperatures, pressures and humidity. It is expected to be completed in January 2016.

August 24, 2015 - UNL teams win big in ASHRAE student competitions

 The UNL entries to the ASHRAE Student Design Competition beat out teams from all over the world to take:
1st place in System Selection
1st place in Design Calculations
3rd place in Applied Engineering Challenge
Dr. Yuill served as the faculty advisor to the teams. Read more here: Nebraska Engineering News

April 24, 2015 - Behfar wins Milton Mohr Graduate Scholarship

Alireza Behfar, a doctoral candidate in Architectural Engineering, has been awarded the Milton Mohr Graduate Scholarship.

April 8, 2015 - Yu and Yuill win ASHRAE research project

Dr. Yu (PI) and Dr. Yuill (Co-PI) have been awarded ASHRAE Research Project 1615-RP: Fault Detection and Diagnostic (FDD) Methods for Supermarkets- Phase I. This project will begin immediately. It is sponsored by ASHRAE's TC 7.5 - Smart Building Systems.

March 18, 2015 - ASHRAE to offer "Best Graduate Student Paper" award

ASHRAE has announced a new program to give an award for the best graduate student conference paper. Details are provided in a press release at ASHRAE

March 6, 2015 - EPA Approves Climate-Friendly Refrigerants

The EPA has announced approval of several climate-friendly refrigerants for air-conditioning applications, including several natural refrigerants. From the EPA announcement:
• Ethane in very low temperature refrigeration and in non-mechanical heat transfer;
• Isobutane in retail food refrigeration (stand-alone commercial refrigerators and freezers) and in vending machines;
• Propane in household refrigerators, freezers, or combination refrigerators and freezers, in vending machines, and in room air conditioning units; 

February 21, 2015 - Hello World

The N-BE³RG website went live today. Hooray!