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Search Publications by: Brian P. Dougherty (Fed)

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Displaying 1 - 25 of 45

Electrical and Electroluminescence Evaluation of 17 Year Old Monocrystalline Silicon Building Integrated Photovoltaic Modules

December 25, 2023
Author(s)
Andrew Shore, Tali Schlenoff, Bakary Coulibaly, David Navon, Stephanie Moffitt, Brian P. Dougherty, Behrang Hamadani
Longterm reliable operation of photovoltaic modules is necessary to ensure the technology is key to reducing the cost of solar energy. However, degradation mechanisms in the field are not always consistent or predictable. We present a dataset of 72

Empirical Validation of Whole Building Energy Simulation Program under Free-Floating Conditions

September 14, 2022
Author(s)
Lisa Ng, Kim Hyojin, Elizabeth Scacifero, Park Minkyeong, Im Piljae, Brian P. Dougherty, Vance (Wm.) Payne
This paper presents one of the ongoing validation efforts using a low-load residential house: the Net-Zero Energy Residential Test Facility (NZERTF) located on the campus of NIST in Gaithersburg, MD, USA. Among a set of validation tests performed at NZERTF

Characterization of Long-Term Sub-Hourly Thermal Comfort Performance Data

November 1, 2020
Author(s)
Hyojin Kim, Lisa Ng, Brian P. Dougherty, William V. Payne
Current thermal comfort standards do not provide guidelines on how to graphically characterize and benchmark long-term, sub-hourly, thermal comfort. In an effort to address this void, several statistical characterizations and advanced visualization methods

Technology Development and Field Monitoring in nZEB

July 1, 2020
Author(s)
Vance (Wm.) Payne, Brian P. Dougherty
The International Energy Agency (IEA) Heat Pumping Technologies (HPT) Annex 49, "Design and Integration of Heat Pumps for Nearly Zero Energy Buildings," deals with the application of heat pumps as a core component of the HVAC system for nearly or net-zero

Balancing Energy and IAQ: NIST Net-Zero Energy Residential Test Facility

April 18, 2018
Author(s)
Lisa C. Ng, Dustin G. Poppendieck, William S. Dols, Brian P. Dougherty, Steven J. Emmerich
Buildings used 39 % of all energy used in the United States in 2017, with residential buildings and commercial buildings accounting for 20 % and 19% (EIA 2018) respectively. Zero energy buildings have the potential to help extend and accelerate the recent

Differential degradation patterns of photovoltaic backsheets at the array level

February 4, 2018
Author(s)
Andrew W. Fairbrother, Matthew Boyd, Yadong Lyu, Julien Avenet, Peter Illich, Michael Kempe, Brian P. Dougherty, Laura Bruckman, Xiaohong Gu
Photovoltaic backsheet degradation is commonly related to end-of-life failure of a module, and as such is an important factor in system reliability and longevity. Some module manufacturers have recently begun utilizing non-fluoropolymer-based backsheets in

Small Changes Yield Large Results at NIST's Net-Zero Energy Residential Test Facility

September 28, 2017
Author(s)
Arthur H. Fanney, William V. Payne, Joshua D. Kneifel, Lisa C. Ng, Brian P. Dougherty, Tania Ullah, William M. Healy, Farhad Omar
The National Institute of Standards and Technology (NIST) has embarked on a multi-year project to establish that a residence can generate, through the use of renewables, the same amount of energy as it consumes while meeting the energy needs of a typical

Performance Data from the NIST Net-Zero Energy Residential Test Facility

January 17, 2017
Author(s)
William M. Healy, Arthur H. Fanney, Brian P. Dougherty, Lisa C. Ng, William V. Payne, Tania Ullah, Farhad Omar
Data were collected over two separate year-long test periods at the Net-Zero Energy Residential Test Facility, a laboratory that is designed to evaluate a variety of technologies and operational strategies that lead to energy efficient houses with

Heat pump concepts for nZEB – Technology developments, design tools and testing of heat pump systems for nZEB in the USA, Country report IEA HPT Annex 40 Task 2, Task 3 and Task 4 of the USA

December 8, 2015
Author(s)
William V. Payne, Arthur H. Fanney, William M. Healy, Joshua D. Kneifel, Tania Ullah, Farhad Omar, Steven T. Bushby, Brian P. Dougherty, Dustin G. Poppendieck, Lisa C. Ng
The IEA HPT Annex 40 "Heat pump concepts for Nearly Zero Energy Buildings" deals with the application of heat pumps as a core component of the HVAC system for Nearly or Net Zero energy buildings (NZEB). This report covers Task 2 on the system comparison

Net-Zero and Beyond! Design and Performance of NIST’s Net-Zero Energy Residential Test Facility

May 15, 2015
Author(s)
Arthur H. Fanney, William V. Payne, Tania Ullah, Lisa C. Ng, Matthew T. Boyd, Farhad Omar, Mark W. Davis, Harrison M. Skye, Brian P. Dougherty, Brian J. Polidoro, William M. Healy, Joshua D. Kneifel, Betsy Pettit
A Net-Zero Energy Residential Test Facility has been constructed at the National Institute of Standards and Technology in Gaithersburg, Maryland. The facility is being used to demonstrate that a home similar in size, aesthetics, and amenities to those in

Challenges of Irradiance-mode Spectral Response Measurements

October 16, 2014
Author(s)
Behrang H. Hamadani, John F. Roller, Brian P. Dougherty, Howard W. Yoon
Irradiance-mode spectral response measurements of solar cells are important because they provide a direct, reliable and accurate route for determination of the short circuit current (Isc) of solar cells under air mass 1.5 standard reference spectrum. In

Large-area irradiance-mode spectral response measurements of solar cells by a light-emitting-diode- based integrating sphere source

May 30, 2014
Author(s)
Behrang H. Hamadani, John F. Roller, Andrew M. Shore, Brian P. Dougherty, Howard W. Yoon
An irradiance-mode absolute differential spectral response measurement system based on a light emitting diode (LED) array is described. The LEDs are coupled to an integrating sphere whose output irradiance is uniform to better than 2 % over an area of 160

Fast and Reliable Spectral Response Measurements of PV Cells Using Light Emitting Diodes

January 1, 2014
Author(s)
Behrang H. Hamadani, John F. Roller, Brian P. Dougherty, Howard W. Yoon
We present a measurement system for absolute differential spectral responsivity of solar cells based on high-powered LED arrays coupled to an optical light guide capable of large area illumination. Two different measurement techniques were developed and

Absolute spectral responsivity measurements of solar cells by a hybrid optical technique

July 15, 2013
Author(s)
Behrang H. Hamadani, John F. Roller, Brian P. Dougherty, Fiona Persaud, Howard W. Yoon
An irradiance mode, absolute differential spectral response measurement system for solar cells is presented. The system is based on combining the monochromator-based approach of determining the power mode spectral responsivity of cells with an LED-based

Towards realization of a large-area, LED-based solar simulator

November 27, 2011
Author(s)
Behrang H. Hamadani, Kangbin Chua, John F. Roller, Howard W. Yoon, Brian P. Dougherty
LED-based solar simulators have shown great promise as alternative light sources for indoor testing of PV cells as compared to their traditional counterparts. However, large-area uniform illumination more suitable for larger cells and module measurements

Spectroradiometric Characterization of the NIST Pulsed Solar Simulator

August 20, 2009
Author(s)
Howard W. Yoon, Brian P. Dougherty, Vladimir Khromchenko
The spectroradiometric characterization of the NIST indoor pulsed solar simulator is described. The solar simulator has a flash duration of 36.4 ms and is designed for solar panels having a maximum size of 2.0 m by 1.6 m. As per industry standards, the

A Comparison of Predicted to Measured Photovoltaic Module Performance

March 1, 2009
Author(s)
Arthur H. Fanney, Brian P. Dougherty, Mark W. Davis
Computer simulation models to accurately predict the electrical performance of photovoltaic modules are essential. Without such models, potential purchasers of photovoltaic systems have insufficient information to judge the relative merits and cost