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Western Wind and Solar Integration Study (Fact Sheet)

Description: Initiated in 2007 to examine the operational impact of up to 35% penetration of wind, photovoltaic (PV), and concentrating solar power (CSP) energy on the electric power system, the Western Wind and Solar Integration Study (WWSIS) is one of the largest regional wind and solar integration studies to date. The goal is to understand the effects of variability and uncertainty of wind, PV, and CSP on the grid. In the Western Wind and Solar Integration Study Phase 1, solar penetration was limited to … more
Date: September 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Grid Simulator for Testing a Wind Turbine on Offshore Floating Platform

Description: An important aspect of such offshore testing of a wind turbine floating platform is electrical loading of the wind turbine generator. An option of interconnecting the floating wind turbine with the onshore grid via submarine power cable is limited by many factors such as costs and associated environmental aspects (i.e., an expensive and lengthy sea floor study is needed for cable routing, burial, etc). It appears to be a more cost effective solution to implement a standalone grid simulator on a… more
Date: February 1, 2012
Creator: Gevorgian, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Developing a Cost Model and Methodology to Estimate Capital Costs for Thermal Energy Storage

Description: This report provides an update on the previous cost model for thermal energy storage (TES) systems. The update allows NREL to estimate the costs of such systems that are compatible with the higher operating temperatures associated with advanced power cycles. The goal of the Department of Energy (DOE) Solar Energy Technology Program is to develop solar technologies that can make a significant contribution to the United States domestic energy supply. The recent DOE SunShot Initiative sets a very … more
Date: December 1, 2011
Creator: Glatzmaier, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Energy Use Intensity and its Influence on the Integrated Daylighting Design of a Large Net Zero Energy Building: Preprint

Description: Net-zero energy buildings generate as much energy as they consume and are significant in the sustainable future of building design and construction. The role of daylighting (and its simulation) in the design process becomes critical. In this paper we present the process the National Renewable Energy Laboratory embarked on in the procurement, design, and construction of its newest building, the Research Support Facility (RSF) - particularly the roles of daylighting, electric lighting, and simula… more
Date: March 1, 2011
Creator: Guglielmetti , R.; Scheib, J.; Pless, S. D.; Torcellini , P. & Petro, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Updating Interconnection Screens for PV System Integration

Description: This white paper evaluates the origins and usefulness of the capacity penetration screen, offer short-term solutions which could effectively allow fast-track interconnection to many PV system applications, and considers longer-term solutions for increasing PV deployment levels in a safe and reliable manner while reducing or eliminating the emphasis on the penetration screen. Short-term and longer-term alternatives approaches are offered as examples; however, specific modifications to screening … more
Date: February 1, 2012
Creator: Coddington, M.; Mather, B.; Kroposki, B.; Lynn, K.; Razon, A.; Ellis, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Impact of High Solar Penetration in the Western Interconnection

Description: This paper presents an overview of the variable characteristics of solar power, as well as the accompanying grid dynamic performance and operational economics for a system with significant solar generation. The paper will show results of economic operational simulations of a very high solar generation future for the western half of the United States.
Date: December 1, 2010
Creator: Lew, D.; Miller, N.; Clark, K.; Jordan, G. & Gao, Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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U.S. Department of Energy Commercial Reference Building Models of the National Building Stock

Description: The U.S. Department of Energy (DOE) Building Technologies Program has set the aggressive goal of producing marketable net-zero energy buildings by 2025. This goal will require collaboration between the DOE laboratories and the building industry. We developed standard or reference energy models for the most common commercial buildings to serve as starting points for energy efficiency research. These models represent fairly realistic buildings and typical construction practices. Fifteen commercia… more
Date: February 1, 2011
Creator: Deru, M.; Field, K.; Studer, D.; Benne, K.; Griffith, B.; Torcellini, P. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Operating Reserve Reductions from a Proposed Energy Imbalance Market with Wind and Solar Generation in the Western Interconnection

Description: This paper considers several alternative forms of an energy imbalance market (EIM) proposed in the nonmarket areas of the Western Interconnection. The proposed EIM includes two changes in operating practices that independently reduce variability and increase access to responsive resources: balancing authority cooperation and sub-hourly dispatch. As the penetration of variable generation increases on the power system, additional interest in coordination would likely occur. Several alternative ap… more
Date: May 1, 2012
Creator: King, J.; Kirby, B.; Milligan, M. & Beuning, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Setting Whole-Building Absolute Energy Use Targets for the K-12 School, Retail, and Healthcare Sectors: Preprint

Description: This paper helps owners' efficiency representatives to inform executive management, contract development, and project management staff as to how specifying and applying whole-building absolute energy use targets for new construction or renovation projects can improve the operational energy performance of commercial buildings.
Date: August 1, 2012
Creator: Leach, M.; Bonnema, E.; Pless, S. & Torcellini, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Extracting Operating Modes from Building Electrical Load Data: Preprint

Description: Empirical techniques for characterizing electrical energy use now play a key role in reducing electricity consumption, particularly miscellaneous electrical loads, in buildings. Identifying device operating modes (mode extraction) creates a better understanding of both device and system behaviors. Using clustering to extract operating modes from electrical load data can provide valuable insights into device behavior and identify opportunities for energy savings. We present a fast and effective … more
Date: January 1, 2012
Creator: Frank, S.; Polese, L. G.; Rader, E.; Sheppy, M. & Smith, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Desiccant Enhanced Evaporative Air Conditioning: Parametric Analysis and Design; Preprint

Description: This paper presents a parametric analysis using a numerical model of a new concept in desiccant and evaporative air conditioning. The concept consists of two stages: a liquid desiccant dehumidifier and a dew-point evaporative cooler. Each stage consists of stacked air channel pairs separated by a plastic sheet. In the first stage, a liquid desiccant film removes moisture from the process (supply-side) air through a membrane. An evaporatively-cooled exhaust airstream on the other side of the pla… more
Date: October 1, 2012
Creator: Woods, J. & Kozubal, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extremely Low-Energy Design for Army Buildings: Tactical Equipment Maintenance Facility; Preprint

Description: This paper describes the integrated energy optimization process for buildings and building clusters and demonstrates this process for new construction projects and building retrofits. An explanation is given of how mission critical building loads affect possible site and source energy use reduction in Army buildings.
Date: March 1, 2012
Creator: Langner, R.; Deru, M.; Zhivov, A.; Liesen, R. & Herron, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department

Allocating Variability and Reserve Requirements

Description: This presentation describes how you could conceivably allocate variability and reserve requirements, including how to allocate aggregation benefits. Conclusions of this presentation are: (1) Aggregation provides benefits because individual requirements are not 100% correlated; (2) Method needed to allocate reduced requirement among participants; (3) Differences between allocation results are subtle - (a) Not immediately obvious which method is 'better'; (b) Many are numerically 'correct', they … more
Date: October 1, 2011
Creator: Kirby, B.; King, J. & Milligan, M.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
open access

Solar Radiation Research Laboratory (Poster)

Description: SunShot Initiative awardee posters describing the different technologies within the four subprograms of the DOE Solar Program (Photovoltaics, Concentrating Solar Power, Soft Costs, and Systems Integration).
Date: July 1, 2012
Creator: Stoffel, T.; Andreas, A.; Reda, I.; Dooraghi, M.; Habte, A.; Kutchenreiter, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integrating High Levels of Renewables in to the Lanai Electric Grid

Description: The Hawaii Clean Energy Initiative (HCEI) is working with a team led by the U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) and Sandia National Laboratory (Sandia) to assess the economic and technical feasibility of increasing the contribution of renewable energy sources on the island of Lanai with a stated goal of reaching 100% renewable energy. NREL and Sandia partnered with Castle & Cooke, Maui Electric Company (MECO), and SRA International to perform the assess… more
Date: June 1, 2012
Creator: Kroposki, B.; Burman, K.; Keller, J.; Kandt, A.; Glassmire, J. & Lilienthal, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Doubly Fed Induction Generator in an Offshore Wind Power Plant Operated at Rated V/Hz: Preprint

Description: This paper introduces the concept of constant Volt/Hz operation of offshore wind power plants. The deployment of offshore WPPs requires power transmission from the plant to the load center inland. Since this power transmission requires submarine cables, there is a need to use High-Voltage Direct Current transmission, which is economical for transmission distances longer than 50 kilometers. In the concept presented here, the onshore substation is operated at 60 Hz synced with the grid, and the o… more
Date: June 1, 2012
Creator: Muljadi, E.; Singh, M. & Gevorgian, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-Efficiency Retrofit Lessons for Retail from a SuperTarget: Preprint

Description: The National Renewable Energy Laboratory partnered with Target under the Commercial Building Program to design and implement a retrofit of a SuperTarget in Thornton, CO. The result was a retrofit design that predicted 37% energy savings over ASHRAE Standard 90.1-2004, and 29% compared to existing (pre-retrofit) store consumption. The largest savings came from energy efficient lighting, energy efficient cooling systems, improved refrigeration, and better control of plug loads.
Date: February 1, 2013
Creator: Langner, R.; Deru, M.; Hirsch, A. & Williams, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Verification and Validation of EnergyPlus Conduction Finite Difference and Phase Change Material Models for Opaque Wall Assemblies

Description: Phase change materials (PCMs) represent a potential technology to reduce peak loads and HVAC energy consumption in buildings. There are few building energy simulation programs that have the capability to simulate PCM but their accuracy has not been completely tested. This report summarizes NREL efforts to develop diagnostic tests cases to obtain accurate energy simulations when PCMs are modeled in residential buildings.
Date: July 1, 2012
Creator: Tabares-Velasco, P. C.; Christensen, C.; Bianchi, M. & Booten, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Using an Energy Performance Based Design-Build Process to Procure a Large Scale Low-Energy Building: Preprint

Description: This paper will review a procurement, acquisition, and contract process of a large-scale replicable net zero energy (ZEB) office building. The owners developed and implemented an energy performance based design-build process to procure a 220,000 ft2 office building with contractual requirements to meet demand side energy and LEED goals. We will outline the key procurement steps needed to ensure achievement of our energy efficiency and ZEB goals. The development of a clear and comprehensive Requ… more
Date: May 1, 2011
Creator: Pless, S.; Torcellini, P. & Shelton, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Method for Determining Optimal Residential Energy Efficiency Retrofit Packages

Description: Businesses, government agencies, consumers, policy makers, and utilities currently have limited access to occupant-, building-, and location-specific recommendations for optimal energy retrofit packages, as defined by estimated costs and energy savings. This report describes an analysis method for determining optimal residential energy efficiency retrofit packages and, as an illustrative example, applies the analysis method to a 1960s-era home in eight U.S. cities covering a range of Internatio… more
Date: April 1, 2011
Creator: Polly, B.; Gestwick, M.; Bianchi, M.; Anderson, R.; Horowitz, S.; Christensen, C. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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