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Research Papers

Configuration of Building Façade Surface for Seasonal Selectiveness of Solar Irradiation—Absorption and Reflection

[+] Author and Article Information
Mohammad H. Naraghi

Professor
ASME Fellow
e-mail: mohammad.naraghi@manhattan.edu

Adrien Harant

Graduate student (as a part of dual Master
program with ECAM, Lyon, France)
e-mail: adrien.harant@gmail.com
Department of Mechanical Engineering,
Manhattan College,
Riverdale, NY 10471

1Corresponding author.

2United States Patent Application No. 13/357,038, International Patent PCT/US2012/22390.

Contributed by the Solar Energy Division of ASME for publication in the JOURNALOF SOLAR ENERGY ENGINEERING. Manuscript received August 22, 2011; final manuscript received April 6, 2012; published online July 6, 2012. Assoc. Editor: Gregor P. Henze.

J. Sol. Energy Eng. 135(1), 011004 (Jul 06, 2012) (9 pages) doi:10.1115/1.4006673 History: Received August 22, 2011; Revised April 06, 2012

A novel building façade surface configuration is proposed. This façade consists of grooved cavities that are configured in a manner that reflects summer (cooling season) insolation and absorbs winter (heating season) insolation. The effective absorptivities of the façade for various cavity reflectance characteristics, i.e., a wide range of diffuse and specular reflectance characteristics, are evaluated using a Monte Carlo model. It was determined that the best cavity surface reflectivity has fully diffuse surfaces and an absorptivity about 0.7. This reflectance characteristic of the cavities results in a small depth of the façade cavities and thicker divider wedge between adjacent cavities. The calculations in the present work are performed for a location proximate to the latitude of 41 deg N where both heating and cooling loads are significant. The same model can be applied to locations with different latitudes and building heating and cooling loads, which may result in slightly different cavity configurations and effective absorptivities.

Copyright © 2012 by ASME
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References

Figures

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Fig. 1

Interaction of summer and winter solar rays with a proposed absorbing/reflecting façade

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Fig. 2

The solar altitude angle β, azimuth angle φ, and zenith angle θz

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Fig. 3

Solar altitude angle versus azimuth angle for latitude of 41 deg N

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Fig. 4

Projection of solar ray on a plane perpendicular to a south-facing façade

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Fig. 5

Profile angle for a south-facing façade at 41 deg N

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Fig. 6

Summer solar ray at minimum projection angle perpendicular to the highly reflective surface

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Fig. 7

Solar irradiation rays shown with equally spaced rays arriving at a typical cavity groove

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Fig. 8

The average number of bounces versus the profile angle for solar rays based on specular, specular-diffuse and diffuse reflections

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Fig. 9

Effective absorptivity versus profile angle for cavity surface absorptivity and tip absorptivity of 0.05

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Fig. 10

Effect of cavity depth on the number of bounces when cavity surface is 100% diffuse

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Fig. 11

Effect of cavity depth on the number of bounces when cavity surface is 50% diffuse and 50% specular

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Fig. 12

Effect of cavity depth on the number of bounces when cavity surface is 25% diffuse and 75% specular

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Fig. 13

Effect of cavity depth on the number of bounces when cavity surface is 100% specular

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Fig. 14

Effect of angle γ2 on the number of bounces when cavity surface is 100% diffuse

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Fig. 15

Effect of angle γ2 on the number of bounces when cavity surface is 50% diffuse and 50% specular

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Fig. 16

Effect of angle γ2 on the number of bounces when cavity surface is 25% diffuse and 75% specular

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Fig. 17

Effect of angle γ2 on the number of bounces when cavity surface is 100% specular

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