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Best Practice for Energy Efficient Cleanrooms: Minienvironments

Description: Cleanroom air-recirculation systems typically account for a significant portion of the HVAC energy use in cleanrooms. High electric power density is normally required for fans to deliver large volume of airflows that were designed, supplied, recirculated, and exhausted within a given time. With the increasing demand for specific contamination control, it is important to optimize design of clean spaces. Best practice in cleanroom air system design includes right-sizing the systems in cleanrooms … more
Date: June 15, 2005
Creator: Xu, Tengfang
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Best Practice for Energy Efficient Cleanrooms: Fan-Filter Units

Description: The HVAC systems in cleanrooms may use 50 percent or more of the total cleanroom energy use. Fan energy use accounts for a significant portion (e.g., over 50%) of the HVAC energy use in cleanrooms such as ISO Classes 3, 4, or 5. Three types of air-handling systems for recirculating airflows are commonly used in cleanrooms: (1) fan-tower systems with pressurized plenum, (2) ducted HEPA systems with distributed-fans, and (3) systems with fan-filter units. Because energy efficiency of the recircul… more
Date: June 15, 2005
Creator: Xu, Tengfang
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Best practices guide for residential HVAC Retrofits

Description: This best practices guide for residential HVAC system retrofits is aimed at contractors who want guidance on delivering energy efficient, cost effective and innovative products. It has been developed around the idea of having packages of changes to the building HVAC system and building envelope that are climate and house construction dependent. These packages include materials, procedures and equipment and are designed to remove some of the guesswork from a builder, contractor, installer or hom… more
Date: August 11, 2003
Creator: Walker, Iain S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Building America Systems Integration Research Annual Report: FY 2012

Description: This document is the Building America FY2012 Annual Report, which includes an overview of the Building America Program activities and the work completed by the National Renewable Energy Laboratory and the Building America industry consortia (the Building America teams). The annual report summarizes major technical accomplishments and progress towards U.S. Department of Energy Building Technologies Program's multi-year goal of developing the systems innovations that enable risk-free, cost effect… more
Date: May 1, 2013
Creator: Gestwick, M.
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

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
open access

Thermal Performance of Uninsulated and Partially Filled Wall Cavities: Preprint

Description: Low-rise, wood-framed homes are the most common type of residential structures in the United States. Wood wall construction supports roofs efficiently and provides a stable frame for attaching interior and exterior wall coverings. Wall cavities are prevalent and increase thermal resistance, particularly when they are filled with insulating material. This paper describes detailed computational fluid dynamics modeling to evaluate the thermal performance of uninsulated or partially filled wall cav… more
Date: August 1, 2011
Creator: Ridouane, E. H. & Bianchi, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Bay Ridge Gardens - Mixed Humid Affordable Multifamily Housing Deep Energy Retrofit: Annapolis, Maryland. Building America Case Study: Whole-House Solutions for Existing Homes (Fact Sheet)

Description: Under this project, Newport Partners (as part of the BA-PIRC research team) evaluated the installation, measured performance, and cost-effectiveness of efficiency upgrade measures for a tenant-in-place DER at the Bay Ridge multifamily (MF) development in Annapolis, Maryland. The design and construction phase of the Bay Ridge project was completed in August 2012. This report summarizes system commissioning, short-term test results, utility bill data analysis, and analysis of real-time data colle… more
Date: October 1, 2013
Item Type: Refine your search to only Report
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

Advanced Energy Retrofit Guide: Practical Ways to Improve Energy Performance; Grocery Stores (Revised) (Book)

Description: The U.S. Department of Energy developed the Advanced Energy Retrofit Guides (AERGs) to provide specific methodologies, information, and guidance to help energy managers and other stakeholders successfully plan and execute energy efficiency improvements. Detailed technical discussion is fairly limited in these guides. Instead, we emphasize actionable information, practical methodologies, diverse case studies, and unbiased evaluations of the most promising retrofit measures for each building type… more
Date: July 1, 2013
Creator: Hendron, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Addendum to the Building America House Simulation Protocols

Description: As Building America (BA) has grown to include a large and diverse cross-section of the home building and retrofit industries, it has become more important to develop accurate, consistent analysis techniques to measure progress towards the program's goals. The House Simulation Protocols (HSP) provides guidance to program partners and managers so that energy savings for new construction and retrofit projects can be compared alongside each other. The HSP provides the program with analysis methods … more
Date: December 1, 2012
Creator: Engebrecht-Metzger, C.; Wilson, E. & Horowitz, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tool to Prioritize Energy Efficiency Investments

Description: To provide analytic support of the U.S. Department of Energy's Office of the Building Technology Program (BTP), NREL developed a Microsoft Excel-based tool to provide an open and objective comparison of the hundreds of investment opportunities available to BTP. This tool uses established methodologies to evaluate the energy savings and cost of those savings.
Date: August 1, 2012
Creator: Farese, P.; Gelman, R. & Hendron, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

Scripted Building Energy Modeling and Analysis

Description: Building energy analysis is often time-intensive, error-prone, and non-reproducible. Entire energy analyses can be scripted end-to-end using the OpenStudio Ruby API. Common tasks within an analysis can be automated using OpenStudio Measures. Graphical user interfaces (GUI's) and component libraries reduce time, decrease errors, and improve repeatability in energy modeling.
Date: October 1, 2012
Creator: Macumber, D.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Heat Pump Water Heater Modeling in EnergyPlus

Description: This presentation summarizes NREL's development of a HPWH model for use in hourly building energy simulation programs, such as BEopt; this presentation was given at the Building America Stakeholder meeting on March 1, 2012, in Austin, Texas.
Date: March 1, 2012
Creator: Wilson, E. & Christensen, C.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
open access

Controlling Capital Costs in High Performance Office Buildings: A Review of Best Practices for Overcoming Cost Barriers

Description: This paper presents a set of 15 best practices for owners, designers, and construction teams of office buildings to reach high performance goals for energy efficiency, while maintaining a competitive budget. They are based on the recent experiences of the owner and design/build team for the Research Support Facility (RSF) on National Renewable Energy Facility's campus in Golden, CO, which show that achieving this outcome requires each key integrated team member to understand their opportunities… more
Date: May 1, 2012
Creator: Pless, S. & Torcellini, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rapid Application Development with OpenStudio: Preprint

Description: This paper presents several case studies of rapidly implemented, audience-specific applications for whole building energy modeling and standards analysis. By tailoring each application to the audience and the task at hand, the required learning curve for new users was greatly reduced. Each case study used OpenStudio, the U.S. Department of Energy's middleware software development kit (SDK). OpenStudio provides an easy interface to the EnergyPlus whole building simulation engine, while extending… more
Date: May 1, 2012
Creator: Weaver, E.; Long, N.; Fleming, K.; Schott, M.; Benne, K. & Hale, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Deep in Data: Empirical Data Based Software Accuracy Testing Using the Building America Field Data Repository: Preprint

Description: An opportunity is available for using home energy consumption and building description data to develop a standardized accuracy test for residential energy analysis tools. That is, to test the ability of uncalibrated simulations to match real utility bills. Empirical data collected from around the United States have been translated into a uniform Home Performance Extensible Markup Language format that may enable software developers to create translators to their input schemes for efficient acces… more
Date: June 1, 2013
Creator: Neymark, J. & Roberts, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

IEA BESTEST Multi-Zone Non-Airflow In-Depth Diagnostic Cases: Preprint

Description: This paper documents a set of in-depth diagnostic test cases for multi-zone heat transfer models that do not include the heat and mass transfer effects of airflow between zones. The multi-zone non-airflow test cases represent an extension to IEA BESTEST (Judkoff and Neymark 1995a).
Date: November 1, 2011
Creator: Neymark, J.; Judkoff, R.; Alexander, D.; Felsmann, C.; Strachan, P. & Wijsman, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Field Monitoring Protocol: Heat Pump Water Heaters

Description: This document provides a standard field monitoring protocol for evaluating the installed performance of Heat Pump Water Heaters in residential buildings. The report is organized to be consistent with the chronology of field test planning and execution. Research questions are identified first, followed by a discussion of analysis methods, and then the details of measuring the required information are laid out. A field validation of the protocol at a house near the NREL campus is included for ref… more
Date: February 1, 2013
Creator: Sparn, B.; Earle, L.; Christensen, D.; Maguire, J.; Wilson, E. & Hancock, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Object-Oriented Database for Managing Building Modeling Components and Metadata: Preprint

Description: Building simulation enables users to explore and evaluate multiple building designs. When tools for optimization, parametrics, and uncertainty analysis are combined with analysis engines, the sheer number of discrete simulation datasets makes it difficult to keep track of the inputs. The integrity of the input data is critical to designers, engineers, and researchers for code compliance, validation, and building commissioning long after the simulations are finished. This paper discusses an appl… more
Date: December 1, 2011
Creator: Long, N.; Fleming, K. & Brackney, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department

Automated Comparison of Building Energy Simulation Engines

Description: This presentation describes the BEopt comparative test suite, which is a tool that facilitates the automated comparison of building energy simulation engines. It also demonstrates how the test suite is improving the accuracy of building energy simulation programs. Building energy simulation programs inform energy efficient design for new homes and energy efficient upgrades for existing homes. Stakeholders rely on accurate predictions from simulation programs. Previous research indicates that so… more
Date: August 1, 2012
Creator: Polly, B.; Horowitz, S.; Booten, B.; Kruis, N. & Christensen, C.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
open access

Technical Support Document: Development of the Advanced Energy Design Guide for Large Hospitals - 50% Energy Savings

Description: This Technical Support Document describes the process and methodology for the development of the Advanced Energy Design Guide for Large Hospitals: Achieving 50% Energy Savings Toward a Net Zero Energy Building (AEDG-LH) ASHRAE et al. (2011b). The AEDG-LH is intended to provide recommendations for achieving 50% whole-building energy savings in large hospitals over levels achieved by following Standard 90.1-2004. The AEDG-LH was created for a 'standard' mid- to large-size hospital, typically at l… more
Date: June 1, 2013
Creator: Bonnema, E.; Leach, M. & Pless, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Building Energy Simulation Test for Existing Homes (BESTEST-EX) Methodology: Preprint

Description: The test suite represents a set of cases applying the new Building Energy Simulation Test for Existing Homes (BESTEST-EX) Methodology developed by NREL. (Judkoff et al. 2010a). The NREL team developed the test cases in consultation with the home retrofit industry (BESTEST-EX Working Group 2009), and adjusted the test specifications in accordance with information supplied by a participant with access to large utility bill datasets (Blasnik 2009).
Date: November 1, 2011
Creator: Judkoff, R.; Polly, B.; Bianchi, M. & Neymark, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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