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Impact Of Shading On Cooling And Heating Load

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2008 Annual Conference & Exposition


Pittsburgh, Pennsylvania

Publication Date

June 22, 2008

Start Date

June 22, 2008

End Date

June 25, 2008



Conference Session

Solar Power, Wind Power, and Energy System Initiatives

Tagged Division

Energy Conversion and Conservation

Page Count


Page Numbers

13.695.1 - 13.695.9



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Paper Authors


Narciso Macia Arizona State University

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Narciso F. Macia is an Associate Professor in the Department of Electronic Systems, at Arizona State University at the Polytechnic campus (formerly ASU East). He received B.S. and M.S. degrees in mechanical engineering in 1974 and 1976 from the University of Texas at Arlington. He also received a Ph.D. in electrical engineering from Arizona State University in 1988. He is a Registered Engineer in the State of Arizona.

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John-Paul Ishioye Arizona State University

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John-Paul Ishioye graduate research assistant at ASU-PTL, Arizona State University Photovoltaic Testing Laboratory. He has a Bachelors degree in Electronics Engineering Technology from University of Missouri Central. He is currently completing his Master's degree in Alternative Energy Technologies at ASU. ASU-PTL is the only accredited design qualification laboratory in the United States. ASU-PTL has tested more than 3000 PV modules and issued more than 280 qualification certificates. ASU-PTL participates in the development of national and international standards of ASTM, IEEE and IEC.

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Brigid Dotson University of Washington

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Brigid Dotson is an atmospheric scientist living in Seattle, WA. She graduated summa cum laude with a B.S. in Geography with a concentration in Meteorology from Arizona State University in 2004. In 2007, she graduated with a M.S. degree in Atmospheric Science from the University of Washington in Seattle, WA. Her undergraduate work focused on human-environment topics, water resources in southern Arizona, and strange weather phenomena. Her graduate work focuses on Pacific Northwest weather, specifically high wind events in the Puget Sound region.

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Maria Macia Veritas Preparatory Academy

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Maria Macia received a BA in Economics and Political Science from Swarthmore College in 2007. She is currently teaching high school math and humane letters at Veritas Preparatory Academy in Phoenix, Arizona.

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NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Impact of Shading on the Cooling and Heating Loads of a Typical Residential


Narciso F. Macia, John Paul Ishioye, Brigid Dotson, Maria Macia

Electronic Systems Department Arizona State University at the Polytechnic campus

Abstract This paper explores the implications of shading the roof of a residence on the cooling and heating loads. This is done by simulating a thermal model of a hypothetical 2800 sq. ft house which takes into consideration direct and diffuse solar irradiation on its roof and walls. The simulation is performed for a home in the southwest portion of the United States, specifically, Phoenix. The simulation is performed twice: a) with half of the roof shaded with PV modules mounted on a rack, and b) with no PV modules. Even though the specific device used here to provide the shading is PV arrays, any other means would produce similar results. The dynamic thermal model of the house is implemented in TK-Solver. The simulation goes through every hour to determine the required cooling and heating load. It takes into consideration direct and diffuse solar irradiance. It uses the Sol-Air temperature approach to determine wall and roof temperatures. This approach modifies the outside skin temperature depending on direct and diffuse irradiation. Weather data for Phoenix, for the year 1990, is used in the simulation. The simulation results are used to perform an economic analysis, specifically, the impact on the payback period. The yearly cooling costs are reduced by $126, while the heating cost increases by $25. Thus the shading produced by the PV arrays has a net effect of reducing the yearly electric bill by approximately 11%. A major motivation for this study is to expose students to the tools and methodologies of modeling dynamic physical systems, especially in the energy area.

Introduction In the southwest of the United States, cooling load accounts for a large portion of the total utility bill. Similarly PV arrays continue to play an increasing role in green or environment-friendly houses. This is the result of genuine concern for the environment, reduced pay-off periods caused by decreasing PV array prices and attractive government incentives. PV is particularly attractive in the southwest because of an overabundance of sunlight. Even though PV contribution is unquestioned, in real practice it has not achieved the popularity that some had expected. The main reason for this is cost, and the resulting long payoff period. Even after generous state and federal incentives, the payoff period remains around15 years. Shading has an obvious impact on

Proceedings of the 2008 American Society for Engineering Education Annual Conference & Exposition Copyright @ 2008, American Society for Engineering Education

Macia, N., & Ishioye, J., & Dotson, B., & Macia, M. (2008, June), Impact Of Shading On Cooling And Heating Load Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. 10.18260/1-2--4393

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