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Stabilization of High Efficiency CdTe Photovoltaic Modules in Controlled Indoor Light Soaking

Description: The performance and stabilization of large-area, high-efficiency 9%, CdTe photovoltaic (PV) modules maintained under controlled light-soaking nominally at 800 Watts/m2 irradiance and 65C module temperature are investigated. Degradation of module performance occurs predominantly in the first few hundred hours of exposure under these conditions; these symptoms included losses in fill factor (FF), open-circuit voltage (Voc), and short-circuit current (Isc), which amount to between 7% and 15% total… more
Date: May 1, 2003
Creator: del Cueto, J. A.; Pruett, J. & Cunningham, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Laboratory Test Report for Fujitsu 12RLS and Mitsubishi FE12NA Mini-Split Heat Pumps

Description: Mini-split heat pumps are being proposed as a new retrofit option to replace resistance heating in the Pacific Northwest. NREL has previously developed a field test protocol for mini-split systems to ensure consistent results from field tests. This report focuses on the development of detailed system performance maps for mini-split heat pumps so that the potential benefits of mini-split systems can be accurately analyzed for different climate regions and housing types. This report presents labo… more
Date: September 1, 2011
Creator: Winkler, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Exposure-Relevant Ozone Chemistry in Occupied Spaces

Description: Ozone, an ambient pollutant, is transformed into other airborne pollutants in the indoor environment. In this dissertation, the type and amount of byproducts that result from ozone reactions with common indoor surfaces, surface residues, and vapors were determined, pollutant concentrations were related to occupant exposure, and frameworks were developed to predict byproduct concentrations under various indoor conditions. In Chapter 2, an analysis is presented of secondary organic aerosol format… more
Date: April 1, 2009
Creator: Coleman, Beverly Kaye
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Effectiveness of Urban Shelter-in-Place. III: Commercial Districts

Description: In the event of a toxic chemical release to the atmosphere, shelter-in-place (SIP) is an emergency response option available to protect public health. This paper is the last in a three-part series that examines the effectiveness of SIP at reducing adverse health effects in communities. We model a hypothetical chemical release in an urban area, and consider SIP effectiveness in protecting occupants of commercial buildings. Building air infiltration rates are predicted from empirical data using a… more
Date: December 28, 2007
Creator: Chan, Wanyu R.; Chan, Wanyu R.; Nazaroff, William W.; Price, Phillip N. & Gadgil, Ashok J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Impacts of Mixing on Acceptable Indoor Air Quality in Homes

Description: Ventilation reduces occupant exposure to indoor contaminants by diluting or removing them. In a multi-zone environment such as a house, every zone will have different dilution rates and contaminant source strengths. The total ventilation rate is the most important factor in determining occupant exposure to given contaminant sources, but the zone-specific distribution of exhaust and supply air and the mixing of ventilation air can play significant roles. Different types of ventilation systems wi… more
Date: January 1, 2010
Creator: Sherman, Max H. & Walker, Iain I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Laboratories for the 21st Century: Best Practices; Modeling Exhaust Dispersion for Specifying Acceptable Exhaust/Intake Design (Brochure)

Description: This guide provides general information on specifying acceptable exhaust and intake designs. It also provides various quantitative approaches that can be used to determine expected concentration levels resulting from exhaust system emissions. In addition, the guide describes methodologies that can be employed to operate laboratory exhaust systems in a safe and energy efficient manner by using variable air volume (VAV) technology. The guide, one in a series on best practices for laboratories, wa… more
Date: September 1, 2011
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

National Grid Deep Energy Retrofit Pilot

Description: Through discussion of five case studies (test homes), this project evaluates strategies to elevate the performance of existing homes to a level commensurate with best-in-class implementation of high-performance new construction homes. The test homes featured in this research activity participated in Deep Energy Retrofit (DER) Pilot Program sponsored by the electric and gas utility National Grid in Massachusetts and Rhode Island. Building enclosure retrofit strategies are evaluated for impact on… more
Date: March 1, 2012
Creator: Neuhauser, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Humidity Control Options in Hot-Humid Climate Homes (Fact Sheet)

Description: This technical highlight describes NREL research to analyze the indoor relative humidity in three home types in the hot-humid climate zone, and examine the impacts of various dehumidification equipment and controls. As the Building America program researches construction of homes that achieve greater source energy savings over typical mid-1990s construction, proper modeling of whole-house latent loads and operation of humidity control equipment has become a high priority. Long-term high relativ… more
Date: December 1, 2011
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling Population Exposures to Pollutants Emitted from Natural Gas Cooking Burners

Description: We developed a physics-based data-supported model to investigate indoor pollutant exposure distributions resulting from use of natural gas cooking appliances across households in California. The model was applied to calculate time-resolved indoor concentrations of CO, NO2 and formaldehyde resulting from cooking burners and entry with outdoor air. Exposure metrics include 1-week average concentrations and frequency of exceeding ambient air quality standards. We present model results for Southern… more
Date: June 1, 2011
Creator: Lobscheid, Agnes; Singer, Brett C. & Klepeis, Neil E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-Efficiency Variable Dehumidification for Air Conditioners: ClimaStat

Description: Advantek has successfully developed the first low-cost technology offering significant improvement in both Seasonal Energy Efficiency (SEER) and comfort & humidity control. A production prototype was constructed based on a commercial roof top package unit. The prototype was operated under a wide range of psychrometric conditions. Test data was analyzed to identify refinements, which were implemented to further improve performance in an iterative procedure that resulted in a fully optimized tech… more
Date: April 30, 2006
Creator: West, Michael K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Airborne Metagenome in an Indoor Urban Environment

Description: The indoor atmosphere is an ecological unit that impacts on public health. To investigate the composition of organisms in this space, we applied culture-independent approaches to microbes harvested from the air of two densely populated urban buildings, from which we analyzed 80 megabases genomic DNA sequence and 6000 16S rDNA clones. The air microbiota is primarily bacteria, including potential opportunistic pathogens commonly isolated from human-inhabited environments such as hospitals, but no… more
Date: February 12, 2008
Creator: Tringe, Susannah; Zhang, Tao; Liu, Xuguo; Yu, Yiting; Lee, Wah Heng; Yap, Jennifer et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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