High-Performance, Energy-Efficient Cool Metal Roof Assemblies Utilizing Building Integrated Renewable Solar Energy Technologies for New and Retrofit Building Construction
EW-201139
Objective
Building science community best practices often prescribe a top-down approach to building retrofits, and the Department of Defense (DoD) is accelerating the specification of renewable solar enery in its construction planning processes. The objective of this project is to demonstrate how solar electric and solar thermal technologies integrated with a retrofit metal roof system can improve energy efficiency, lower the environmental impact, and reduce operating costs in existing DoD buildings.
Technology Description
A holistically designed retrofit metal re-roofing system creates an air space by adding structural subframing atop the existing roof and then installing a new metal roof over the assembly. This air space provides the opportunity to add high-performance insulation and solar thermal air and water heating and cooling systems between the two roofs. It then enables solar electricity and rainwater collection systems to be installed on the topside of the new metal roof. This innovative assembly of well-accepted roofing components is referred to as a "fully integrated retrofit metal roof system."
This project will demonstrate the synergy of these technologies when integrated into the overall retrofit roof assembly. Energy savings from these technologies will improve the energy efficiency of the building and lower the electrical energy demand from the grid and on fossil fuels for water heating and space conditioning. In addition, the incorporation of a rainwater harvesting system will reduce the demand for fresh water.
Benefits
It is anticipated that these high-performance roofing systems will deliver approximately 6 kWh and 6-12 kWh-T (kWh thermal equivalent) per square foot of installed area, depending on location, solar array orientation, and thermal system loads. Converting an existing roof assembly with R-19 insulation to an R-51 roof assembly including roofing, rainwater collection, air barrier and insulation upgrades, and roof integrated renewable energy systems (PV and Thermal) will cost in the range of $69 to $72 per square foot of installed roof area. In addition to reducing energy consumption, these improvements will improve DoD's capability of obtaining USGBC LEED certification on new and retrofit projects. (Anticipated Project Completion - 2013)
Points of Contact
Principal Investigator
Mr. Robert Scichili
Robert Scichili Associates Inc.
Phone: 214-236-9902
Document Types
- Fact Sheet - Brief project summary with links to related documents and points of contact.
- Final Report - Comprehensive report for every completed SERDP and ESTCP project that contains all technical results.
- Cost & Performance Report - Overview of ESTCP demonstration activities, results, and conclusions, standardized to facilitate implementation decisions.
- Technical Report - Additional interim reports, laboratory reports, demonstration reports, and technology survey reports.
- Guidance - Instructional information on technical topics such as protocols and user’s guides.
- Workshop Report - Summary of workshop discussion and findings.
- Multimedia - On demand videos, animations, and webcasts highlighting featured initiatives or technologies.
- Model/Software - Computer programs and applications available for download.
- Database - Digitally organized collection of data available to search and access.