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SunEdison Photovoltaic Grid Integration Evaluation: Cooperative Research and Development Final Report, CRADA Number CRD-08-302

Description: Under this Agreement, NREL will work with SunEdison to monitor and analyze the performance of photovoltaic (PV) systems as they relate to grid integration. Initially this project will examine the performance of PV systems with respect to evaluating the benefits and impacts on the electric power grid.
Date: September 1, 2012
Creator: Kroposki, B.
Partner: UNT Libraries Government Documents Department

Dew Point Evaporative Comfort Cooling: Report and Summary Report

Description: The project objective was to demonstrate the capabilities of the high-performance multi-staged IEC technology and its ability to enhance energy efficiency and interior comfort in dry climates, while substantially reducing electric-peak demand. The project was designed to test 24 cooling units in five commercial building types at Fort Carson Army Base in Colorado Springs, Colorado.
Date: November 1, 2012
Creator: Dean, J.; Herrmann, L.; Kozubal, E.; Geiger, J.; Eastment, M. & Slayzak, S.
Partner: UNT Libraries Government Documents Department

Measure Guideline: Wall Air Sealing and Insulation Methods in Existing Homes; An Overview of Opportunity and Process

Description: This guide provides renovators and retrofit contractors an overview of considerations when including wall air sealing and insulation in an energy retrofit project. It also outlines the potential project risks, various materials for insulating, possible field inspections needed, installation procedures, as well as the benefits and drawbacks. The purpose of this document is to provide the outline of the overview and process of insulating and air sealing walls so that home retrofit professionals can identify approaches to air sealing and insulation measures.
Date: September 1, 2012
Creator: Roberts, S. & Stephenson, R.
Partner: UNT Libraries Government Documents Department

Expert Meeting Report: Recommendations for Applying Water Heaters in Combination Space and Domestic Water Heating Systems

Description: The topic of this meeting was 'Recommendations For Applying Water Heaters In Combination Space And Domestic Water Heating Systems.' Presentations and discussions centered on the design, performance, and maintenance of these combination systems, with the goal of developing foundational information toward the development of a Building America Measure Guideline on this topic. The meeting was held at the Westford Regency Hotel, in Westford, Massachusetts on 7/31/2011.
Date: July 1, 2012
Creator: Rudd, A.; Ueno, K.; Bergey, D. & Osser, R.
Partner: UNT Libraries Government Documents Department

Housing Stock Characterization Study: An Innovative Approach to Measuring Retrofit Impact

Description: A residential energy efficiency retrofit loan program depends on a self-sustaining finance option and optimized retrofit measures that recoup their unsubsidized costs through energy bill savings alone within the useful life of the retrofit. A first step in evaluating retrofit options is to measure and verify their energy savings. This report evaluates Orlando Utilities Commission (OUC) residential energy-efficiency demand side management (DSM) programs to assess their relative energy and economic performance.
Date: September 1, 2012
Creator: Jones, P.; Taylor, N. & Kipp, J.
Partner: UNT Libraries Government Documents Department

Measure Guideline: Energy-Efficient Window Performance and Selection

Description: This document provides guidelines for the selection of energy-efficient windows in new and existing residential construction in all US climate zones. It includes information on window products, their attributes and performance. It provides cost/benefit information on window energy savings as well as information on non-energy benefits such as thermal comfort and reduced HVAC demands. The document also provides information on energy impacts of design decisions such as window orientation, total glazing area and shading devices and conditions. Information on resources for proper window installation is included as well. This document is for builders, homeowners, designers and anyone making decisions about selecting energy efficient window. It is intended to complement other Building America information and efforts.
Date: November 1, 2012
Creator: Carmody, J. & Haglund, K.
Partner: UNT Libraries Government Documents Department

Byggmeister Test Home: Cold Climate Multifamily Masonry Building Condition Assessment and Retrofit Analysis

Description: This report describes a retrofit project undertaken by Building Science Corporation and partner Byggmeister on a multifamily brick row house located in Jamaica Plain, MA. This project studied the row house to determine the right combination of energy efficiency measures that are feasible, affordable, and suitable for this type of construction and acceptable to homeowners.
Date: September 1, 2012
Creator: Wytrykowska, H.; Ueno, K. & Van Straaten, R.
Partner: UNT Libraries Government Documents Department

High Penetration Photovoltaic Case Study Report

Description: Technical concerns with integrating higher penetrations of photovoltaic (PV) systems include grid stability, voltage regulation, power quality (voltage rise, sags, flicker, and frequency fluctuations), and protection and coordination. The current utility grid was designed to accommodate power flows from the central generation source to the transmission system and eventually to the distribution feeders. At the distribution level, the system was designed to carry power from the substation toward the load. Renewable distributed generation, particularly solar PV, provides power at the distribution level challenging this classical paradigm. As these resources become more commonplace the nature of the distribution network and its operation is changing to handle power flow in both directions. This report is focused on large PV installations in which penetration is significantly greater than 15% of maximum daytime feeder load. These case studies are intended to demonstrate success stories with integration of large PV plants at the distribution level as well as some of the solutions used by the utility to ensure safe, reliable operation of both the PV system and the distribution network.
Date: January 1, 2013
Creator: Bank, J.; Mather, B.; Keller, J. & Coddington, M.
Partner: UNT Libraries Government Documents Department

Job/Task Analysis: Enhancing the Commercial Building Workforce Through the Development of Foundational Materials; Preprint

Description: For many commercial building operation job categories, industry consensus has not been reached on the knowledge, skills, and abilities that practitioners should possess. The goal of this guidance is to help streamline the minimum competencies taught or tested by organizations catering to building operations and maintenance personnel while providing a basis for developing and comparing new and existing training programs in the commercial building sector. The developed JTAs will help individuals identify opportunities to enhance their professional skills, enable industry to identify an appropriately skilled workforce, and allow training providers to ensure that they are providing the highest quality product possible.
Date: September 1, 2012
Creator: Studer, D. & Kemkar, S.
Partner: UNT Libraries Government Documents Department

Summary of Gaps and Barriers for Implementing Residential Building Energy Efficiency Strategies

Description: This report presents the key gaps and barriers to implementing residential energy efficiency strategies in the U.S. market, as identified in sessions at the U.S. Department of Energy's Building America 2010 Residential Energy Efficiency Meeting held in Denver, Colorado, on July 20-22, 2010.
Date: August 1, 2010
Partner: UNT Libraries Government Documents Department

Identifying Inefficient Single-Family Homes With Utility Bill Analysis: Preprint

Description: Differentiating between energy-efficient and inefficient single-family homes on a community scale helps identify and prioritize candidates for energy-efficiency upgrades. Prescreening diagnostic procedures can further retrofit efforts by providing efficiency information before a site-visit is conducted. We applied the prescreening diagnostic to a simulated community of homes in Boulder, Colorado and analyzed energy consumption data to identify energy-inefficient homes.
Date: August 1, 2010
Creator: Casey, S.; Krarti, M.; Bianchi, M. & Roberts, D.
Partner: UNT Libraries Government Documents Department

Building Energy Simulation Test for Existing Homes (BESTEST-EX); Phase 1 Test Procedure: Building Thermal Fabric Cases

Description: The U.S. Department of Energy tasked NREL to develop a process for testing the reliability of models that predict retrofit energy savings, including their associated calibration methods. DOE asked NREL to conduct the work in phases so that a test procedure would be ready should DOE need it to meet legislative requirements related to residential retrofits in FY 2010. This report documents the initial 'Phase 1' test procedure.
Date: August 1, 2010
Creator: Judkoff, R.; Polly, B.; Bianchi, M. & Neymark, J.
Partner: UNT Libraries Government Documents Department

Generation of a Parabolic Trough Collector Efficiency Curve from Separate Measurements of Outdoor Optical Efficiency and Indoor Receiver Heat Loss: Preprint

Description: The overall efficiency of a parabolic trough collector is a function of both the fraction of direct normal radiation absorbed by the receiver (the optical efficiency) and the heat lost to the environment when the receiver is at operating temperature. The overall efficiency can be determined by testing the collector under actual operating conditions or by separately measuring these two components. This paper describes how outdoor measurement of the optical efficiency is combined with laboratory measurements of receiver heat loss to obtain an overall efficiency curve. Further, it presents a new way to plot efficiency that is more robust over a range of receiver operating temperatures.
Date: October 1, 2010
Creator: Kutscher, C.; Burkholder, F. & Stynes, K.
Partner: UNT Libraries Government Documents Department

Assessing the Impact of Heat Rejection Technology on CSP Plant Revenue: Preprint

Description: This paper explores the impact of cooling technology on revenue for hybrid-cooled plants with varying wet cooling penetration for four representative locations in the American Southwest. The impact of ACC design-point initial temperature difference (ITD - the difference between the condensing steam temperature and ambient dry-bulb) is also included in the analysis.
Date: October 1, 2010
Creator: Wagner, M. J. & Kutscher, C. F.
Partner: UNT Libraries Government Documents Department

Using DOE Commercial Reference Buildings for Simulation Studies: Preprint

Description: The U.S. Department of Energy developed 256 EnergyPlus models for use in studies that aim to characterize about 70% of the U.S. commercial building stock. Sixteen building types - including restaurants, health care, schools, offices, supermarkets, retail, lodging, and warehouses - are modeled across 16 cities to represent the diversity of U.S. climate zones. Weighting factors have been developed to combine the models in proportions similar to those of the McGraw-Hill Construction Projects Starts Database for 2003-2007. This paper reviews the development and contents of these models and their applications in simulation studies.
Date: August 1, 2010
Creator: Field, K.; Deru, M. & Studer, D.
Partner: UNT Libraries Government Documents Department

Reducing Plug Loads in Office Spaces: Hawaii and Guam Energy Improvement Technology Demonstration Project

Description: As part of its overall strategy to meet its energy goals, the Naval Facilities Engineering Command (NAVFAC) partnered with the Department of Energy's National Renewable Energy Laboratory (NREL) to rapidly demonstrate and deploy cost-effective renewable energy and energy efficiency technologies. This project was one of several demonstrations of new or underutilized commercial energy technologies. The common goal was to demonstrate and measure the performance and economic benefit of the system while monitoring any ancillary impacts to related standards of service and operation and maintenance (O&M) practices. In short, demonstrations at naval facilities simultaneously evaluate the benefits and compatibility of the technology with the U.S. Department of Defense (DOD) mission, and with NAVFAC's design, construction, operations, and maintenance practices, in particular. This project demonstrated the performance of commercially available advanced power strips (APSs) for plug load energy reductions in building A4 at Joint Base Pearl Harbor-Hickam (JBPHH), Hawaii.
Date: January 2014
Creator: Sheppy, M.; Metzger, I.; Cutler, D.; Holland, G. & Hanada, A.
Partner: UNT Libraries Government Documents Department

Algorithm for Screening Phasor Measurement Unit Data for Power System Events and Categories and Common Characteristics for Events Seen in Phasor Measurement Unit Relative Phase-Angle Differences and Frequency Signals

Description: A network of multiple phasor measurement units (PMU) was created, set up, and maintained at the University of Texas at Austin to obtain actual power system measurements for power system analysis. Power system analysis in this report covers a variety of time ranges, such as short- term analysis for power system disturbances and their effects on power system behavior and long- term power system behavior using modal analysis. The first objective of this report is to screen the PMU data for events. The second objective of the report is to identify and describe common characteristics extracted from power system events as measured by PMUs. The numerical characteristics for each category and how these characteristics are used to create selection rules for the algorithm are also described. Trends in PMU data related to different levels and fluctuations in wind power output are also examined.
Date: August 1, 2013
Creator: Allen, A.; Santoso, S. & Muljadi, E.
Partner: UNT Libraries Government Documents Department