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Title: BERKELEY LAB WINDOW

Abstract

WINDOW features include: - Microsoft Windows TM interface - algorithms for the calculation of total fenestration product U-values and Solar Heat Gain Coefficient consistent with ASHRAE SPC 142, ISO 15099, and the National Fenestration Rating Council - a Condensation Resistance Index in accordance with the NFRC 500 Standard - and integrated database of properties - imports data from other LBNL window analysis software: - Import THERM file into the Frame Library - Import records from IGDB and OPtics5 into the Glass Library for the optical properties of coated and uncoated glazings, laminates, and applied films. Program Capabilities WINDOW 7.2 offers the following features: The ability to analyze products made from any combination of glazing layers, gas layers, frames, spacers, and dividers under any environmental conditions and at any tilt; The ability to model complex glazing systems such as venetian blinds and roller shades. Directly accessible libraries of window system components, (glazing systems, glazing layers, gas fills, frame and divider elements), and environmental conditions; The choice of working in English (IP), or Systeme International (SI) units; The ability to specify the dimensions and thermal properties of each frame element (header, sills, jamb, mullion) in a window; A multi-band (wavelength-by-wavelength) spectral model;more » A Glass Library which can access spectral data files for many common glazing materials from the Optics5database; A night-sky radiative model; A link with the DOE-2.1E and Energy Plus building energy analysis program. Performance Indices and Other Results For a user-defined fenestration system and user-defined environmental conditions, WINDOW calculates: The U-value, solar heat gain coefficient, shading coefficient, and visible transmittance for the complete window system; The U-value, solar heat gain coefficient, shading coefficient, and visible transmittance for the glazing system (center-of-glass values); The U-values of the frame and divider elements and corresponding edge-of-glass areas (based on generic correlations); The total solar and visible transmittance and reflectances of the glazing system. Color properties, i.e. L*, a*, and b* color coordinates, dominant wavelength, and purity for transmitted and reflected (outdoor) solar radiation; The damage-weighted transmittance of the glazing system between 0.3 an 0.38 microns; The angular dependence of the solar and visible transmittances, solar and visible reflectances, solar absorptance, and solar heat gain coefficient of the glazing system; The percent relative humidity of the inside and outside air for which condensation will occur on the interior and exterior glazing surfaces respectively; The center-of-glass temperature distribution.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory
Sponsoring Org.:
USDOE
OSTI Identifier:
1232115
Report Number(s):
BERKELEY LAB WINDOW; 003407IBMPC00
R&D Project: BT0304020; 2015-074
DOE Contract Number:
AC02-05CH11231
Resource Type:
Software
Software Revision:
00
Software Package Number:
003407
Software Package Contents:
Open Source Software package available from Lawrence Berkeley National Laboratory at the following URL: http://windows.lbl.gov/software/window/7/index_7_3_8.html
Software CPU:
IBMPC
Open Source:
Yes
Source Code Available:
Yes
Country of Publication:
United States

Citation Formats

Curcija, Dragan Charlie, Zhu, Ling, Czarnecki, Stephen, Mitchell, Robin D., Kohler, Christian, Vidanovic, Simon V., and Huizenga, Charlie. BERKELEY LAB WINDOW. Computer software. https://www.osti.gov//servlets/purl/1232115. Vers. 00. USDOE. 6 Mar. 2015. Web.
Curcija, Dragan Charlie, Zhu, Ling, Czarnecki, Stephen, Mitchell, Robin D., Kohler, Christian, Vidanovic, Simon V., & Huizenga, Charlie. (2015, March 6). BERKELEY LAB WINDOW (Version 00) [Computer software]. https://www.osti.gov//servlets/purl/1232115.
Curcija, Dragan Charlie, Zhu, Ling, Czarnecki, Stephen, Mitchell, Robin D., Kohler, Christian, Vidanovic, Simon V., and Huizenga, Charlie. BERKELEY LAB WINDOW. Computer software. Version 00. March 6, 2015. https://www.osti.gov//servlets/purl/1232115.
@misc{osti_1232115,
title = {BERKELEY LAB WINDOW, Version 00},
author = {Curcija, Dragan Charlie and Zhu, Ling and Czarnecki, Stephen and Mitchell, Robin D. and Kohler, Christian and Vidanovic, Simon V. and Huizenga, Charlie},
abstractNote = {WINDOW features include: - Microsoft Windows TM interface - algorithms for the calculation of total fenestration product U-values and Solar Heat Gain Coefficient consistent with ASHRAE SPC 142, ISO 15099, and the National Fenestration Rating Council - a Condensation Resistance Index in accordance with the NFRC 500 Standard - and integrated database of properties - imports data from other LBNL window analysis software: - Import THERM file into the Frame Library - Import records from IGDB and OPtics5 into the Glass Library for the optical properties of coated and uncoated glazings, laminates, and applied films. Program Capabilities WINDOW 7.2 offers the following features: The ability to analyze products made from any combination of glazing layers, gas layers, frames, spacers, and dividers under any environmental conditions and at any tilt; The ability to model complex glazing systems such as venetian blinds and roller shades. Directly accessible libraries of window system components, (glazing systems, glazing layers, gas fills, frame and divider elements), and environmental conditions; The choice of working in English (IP), or Systeme International (SI) units; The ability to specify the dimensions and thermal properties of each frame element (header, sills, jamb, mullion) in a window; A multi-band (wavelength-by-wavelength) spectral model; A Glass Library which can access spectral data files for many common glazing materials from the Optics5database; A night-sky radiative model; A link with the DOE-2.1E and Energy Plus building energy analysis program. Performance Indices and Other Results For a user-defined fenestration system and user-defined environmental conditions, WINDOW calculates: The U-value, solar heat gain coefficient, shading coefficient, and visible transmittance for the complete window system; The U-value, solar heat gain coefficient, shading coefficient, and visible transmittance for the glazing system (center-of-glass values); The U-values of the frame and divider elements and corresponding edge-of-glass areas (based on generic correlations); The total solar and visible transmittance and reflectances of the glazing system. Color properties, i.e. L*, a*, and b* color coordinates, dominant wavelength, and purity for transmitted and reflected (outdoor) solar radiation; The damage-weighted transmittance of the glazing system between 0.3 an 0.38 microns; The angular dependence of the solar and visible transmittances, solar and visible reflectances, solar absorptance, and solar heat gain coefficient of the glazing system; The percent relative humidity of the inside and outside air for which condensation will occur on the interior and exterior glazing surfaces respectively; The center-of-glass temperature distribution.},
url = {https://www.osti.gov//servlets/purl/1232115},
doi = {},
year = 2015,
month = 3,
note =
}

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  • Calculation of thermal and optical properties of glass, windows and shades. Calculation code only, no GUI.
  • A number of FORTRAN programs useful for computer mapping are supported by the Computer Science and Applied Mathematics Department for preparing base files and displays of statistical data. Digitizing and editing of geographic base files is maintained by the programs MAPEDIT and ZING. Display of statistical attributes of discrete points, lines, or areas in two dimensions is done by the program CARTE. Display in three dimensions or of surfaces is accomplished using subroutines from the Integrated Data Display System. All the programs use a device independent graphics system, GRAFPAC.
  • Measuring the thermal performance of windows in typical residential buildings is an expensive proposition. Not only is laboratory testing expensive, but each window manufacturer typically offers hundreds of individual products, each of which has different thermal performance properties. With over a thousand window manufacturers nationally, a testing-based rating system would be prohibitively expensive to the industry and to consumers. Beginning in the early 1990s, simulation software began to be used as part of a national program for rating window U-values. The rating program has since been expanded to include Solar Hear Gain Coefficients and is now being extended to annualmore » energy performance. This paper describes four software packages available to the public from Lawrence Berkeley National Laboratory (LBNL). These software packages are used to evaluate window thermal performance: RESFEN (for evaluating annual energy costs), WINDOW (for calculating a product`s thermal performance properties), THERM (a preprocessor for WINDOW that determines two-dimensional heat-transfer effects), and Optics (a preprocessor for WINDOW`s glass database). Software not only offers a less expensive means than testing to evaluate window performance, it can also be used during the design process to help manufacturers produce windows that will meet target specifications. In addition, software can show small improvements in window performance that might not be detected in actual testing because of large uncertainties in test procedures.« less

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