Analyzing Two Federal Building-Integrated Photovoltaics Projects Using ENERGY-10 Simulations

Andy Walker, Doug Balcomb, Gregory Kiss, Norm Weaver, Melinda Humphry Becker

Research output: Contribution to journalArticlepeer-review

8 Scopus Citations


A new version of the ENERGY-10 computer program simulates the performance of photovoltaic (PV) systems and evaluates a wide range of opportunities to improve energy efficiency in buildings. This paper describes two test cases in which the beta release of ENERGY-10 version 1.4 was used to evaluate energy efficiency and building-integrated photovoltaics (BIPV) for two federal building projects: an office and laboratory building at the Smithsonian Astrophysical Laboratory (SAO) in Hilo, Hawaii, and housing for visiting scientists at the Smithsonian Environmental Research Center in Edgewater, Maryland. The capabilities of the software, the design assistance provided by ENERGY-10, and a synopsis of results are given. Estimates of annual energy delivery by the five PV arrays of the SAO are compared to F-Chart to help inform a validation of ENERGY-10. Results indicate that, by simulating both the building electrical load and simultaneous PV performance for each hour of the year, ENERGY-10 facilitates a highly accurate, integrated analysis useful early in the design process. The simulation is especially useful in calculating the effect of PV on the building peak load, and associated demand cost savings.

Original languageAmerican English
Pages (from-to)28-33
Number of pages6
JournalJournal of Solar Energy Engineering, Transactions of the ASME
Issue number1
StatePublished - 2003

Bibliographical note

For preprint version, including full text online document, see NREL/CP-710-31310

NREL Publication Number

  • NREL/JA-710-34480


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