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Title: Comparison of software models for energy savings from cool roofs

Abstract

For this study, a web-based Roof Savings Calculator (RSC) has been deployed for the United States Department of Energy as an industry-consensus tool to help building owners, manufacturers, distributors, contractors and researchers easily run complex roof and attic simulations. RSC simulates multiple roof and attic technologies for side-by-side comparison including reflective roofs, different roof slopes, above sheathing ventilation, radiant barriers, low-emittance roof surfaces, duct location, duct leakage rates, multiple substrate types, and insulation levels. Annual simulations of hour-by-hour, whole-building performance are used to provide estimated annual energy and cost savings from reduced HVAC use. While RSC reported similar cooling savings to other simulation engines, heating penalty varied significantly. RSC results show reduced cool roofing cost-effectiveness, thus mitigating expected economic incentives for this countermeasure to the urban heat island effect. This paper consolidates comparison of RSC's projected energy savings to other simulation engines including DOE-2.1E, AtticSim, Micropas, and EnergyPlus. Also included are comparisons to previous simulation-based studies, analysis of RSC cooling savings and heating penalties, the role of radiative heat exchange in an attic assembly, and changes made for increased accuracy of the duct model. Finally, radiant heat transfer and duct interaction not previously modeled is considered a major contributor tomore » heating penalties.« less

Authors:
 [1];  [1];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. (Joe) [White Box Technologies, Moraga, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Contributing Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
1265548
Alternate Identifier(s):
OSTI ID: 1252494
Grant/Contract Number:  
AC05-00OR22725; BT0201000
Resource Type:
Accepted Manuscript
Journal Name:
Energy and Buildings
Additional Journal Information:
Journal Volume: 114; Journal ID: ISSN 0378-7788
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING; Energy efficiency; Building energy modeling; Cool roofs; Urban heat island

Citation Formats

New, Joshua, Miller, William A., Huang, Yu, and Levinson, Ronnen. Comparison of software models for energy savings from cool roofs. United States: N. p., 2015. Web. doi:10.1016/j.enbuild.2015.06.020.
New, Joshua, Miller, William A., Huang, Yu, & Levinson, Ronnen. Comparison of software models for energy savings from cool roofs. United States. doi:10.1016/j.enbuild.2015.06.020.
New, Joshua, Miller, William A., Huang, Yu, and Levinson, Ronnen. Sun . "Comparison of software models for energy savings from cool roofs". United States. doi:10.1016/j.enbuild.2015.06.020. https://www.osti.gov/servlets/purl/1265548.
@article{osti_1265548,
title = {Comparison of software models for energy savings from cool roofs},
author = {New, Joshua and Miller, William A. and Huang, Yu and Levinson, Ronnen},
abstractNote = {For this study, a web-based Roof Savings Calculator (RSC) has been deployed for the United States Department of Energy as an industry-consensus tool to help building owners, manufacturers, distributors, contractors and researchers easily run complex roof and attic simulations. RSC simulates multiple roof and attic technologies for side-by-side comparison including reflective roofs, different roof slopes, above sheathing ventilation, radiant barriers, low-emittance roof surfaces, duct location, duct leakage rates, multiple substrate types, and insulation levels. Annual simulations of hour-by-hour, whole-building performance are used to provide estimated annual energy and cost savings from reduced HVAC use. While RSC reported similar cooling savings to other simulation engines, heating penalty varied significantly. RSC results show reduced cool roofing cost-effectiveness, thus mitigating expected economic incentives for this countermeasure to the urban heat island effect. This paper consolidates comparison of RSC's projected energy savings to other simulation engines including DOE-2.1E, AtticSim, Micropas, and EnergyPlus. Also included are comparisons to previous simulation-based studies, analysis of RSC cooling savings and heating penalties, the role of radiative heat exchange in an attic assembly, and changes made for increased accuracy of the duct model. Finally, radiant heat transfer and duct interaction not previously modeled is considered a major contributor to heating penalties.},
doi = {10.1016/j.enbuild.2015.06.020},
journal = {Energy and Buildings},
number = ,
volume = 114,
place = {United States},
year = {2015},
month = {6}
}

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Cited by: 4 works
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