Boora Stanford E+E Building Daylighting Analysis Black FINAL ISSUE – Amendment 1 September 2006Boora Stanford E+E Building Daylighting Analysis 901 Market Street Suite 260, San Francisco CA 94103 Tel +1 415 957-9445 Fax +1 415 957-9096 www.arup.com Job number 130688-00 September 2006 Ove Arup & Partners California LtdDocument VerificationPage 1 of 1 Job number Job title Stanford E+E Building 130688 File reference Document title Daylighting Analysis Document ref Revision Date Filename FinalReport_Daylighting.doc Description Final Report documenting daylight design Prepared by Checked by Approved by Name Jake Wayne Jason Edling Cole Roberts Final 8/19/06 Signature Filename FinalReport_Daylighting 091806.doc Description Final Report documenting daylight design Prepared by Checked by Approved by Name Jake Wayne Jason Edling Cole Roberts A.1 09/18/06 Signature Filename Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document Page EXECUTIVE SUMMARY 2 1 INTRODUCTION 3 1.1 Site Location 3 2 IDENTIFICATION OF GOALS, STRATEGIES, AND RECOMMMENDATIONS 3 3 ASSESSMENT OF PROJECT AT 100% SD 4 3.1 Light Shelf Design 4 3.2 Atrium Design Optimization for Daylight 5 3.3 Surface Reflectances and Glazing Material properties 5 3.3.1 Glazing Properties 5 3.3.2 Surface Reflectances 6 4 CONTINUING DESIGN DIRECTIVES 6 4.1 Daylight Performance 6 4.2 Increasing Daylight into Core of the Building 8 4.3 Additional Light Shelf Studies 9 4.4 Additional Atrium Studies 9 4.4.1 Direct sunlight impacts on spaces adjacent to atria 10 4.4.2 Daylight availability for Plant growth in Atria 10 4.5 Audio-Visual Media in Daylit Spaces 11 5 CONCLUSIONS 11 Appendix A Cost Benefits Due to Daylighting MeasuresPage 2 Ove Arup & Partners California LtdIssue September 2006 A daylighting analysis was performed to provide a better understanding of how the building architecture and interior spaces of the Environment and Energy (E+E) Building can respond to natural daylight. A metric for evaluating the daylighting design was set forth in the SEQ2 Criteria that was supplemented by programming, architectural requirements, and realistic expectations. Several studies were performed to optimize the daylight delivered to the interior spaces, including sidelighting studies for lightshelves, and a study focusing on the atrium spaces to maximize daylight entering the core of the building. Analysis showed that with specific design conditions being met, the building could achieve theSEQ2 goal of 75% of the building receiving effective daylight. This goal specifically requires that critical task areas receive 25fc or more, and impromptu meeting areas receive 15fc or more at noon on the equinox. Enclosed are a series of recommendations to the Architect (Boora) that will allow the SEQ2 Criteria to be achieved when implemented effectively.Page 3 Ove Arup & Partners California LtdIssue September 2006 The architecture of the Stanford Environment and Energy (E+E) Building was analyzed to identify strategies for optimization of natural daylight usage. Over the course of the schematic design phase, and beyond, several goals have been established, along with strategies and recommendations set forth for achieving these goals. This report will provide an overview of the daylighting design for the E+E building in 3 parts: o Part 1 – Identification of initial goals, recommendations, and strategies as established by the SEQ2 criteria and programming needs. o Part 2 – Assessment of the project at 100% Schematic Design, including specific solutions recommended at that time, and the subsequent revisions to these recommendations. o Part 3 – Elaboration upon continuing design directives, evaluating performance expectations of the strategies set forth, and additional considerations. The recommendations and strategies discussed in this report represent Arup’s responses to the design direction as provided by the Architectural team. The Stanford Campus location for the E+E Building corresponds to the geographic coordinates of 37.424N latitude and 122.165W longitude, in the Pacific Time zone. The sunpath diagram shown in Figure 1 provides a reference for the corresponding sun azimuth and altitude angles over the course of the year. The red line indicates the summer solstice, the green line the equinoxes, and the blue line the winter solstice. Figure 1 - Sunpath diagram for Stanford Campus ! ! The primary goal of the daylighting effort for the E+E Building was to provide a design that reduced the overall lighting load of the building while also taking advantage of the psychological and health benefits associated with having naturally illuminated interiors and views to the outside. Additionally, the opportunity of mitigating solar heat gains in the building while providing natural light weighed heavily on the design. In order to evaluate the effectiveness of the design in meeting the said goal, the E+E building is being designed in an effort to meet or exceed the guidelines set forth by the SEQ2 Master Plan Document. In doing so the design strives to meet or exceed the standards put forth in the LEED Green Building Rating System for New Construction Version 2.2 Credit 8.1. This standard requires 75% of the critical task areas in the building to have 25 [fc] or more, at 30 inches above finished floor (AFF), under specifically clear sky conditions at noon on the equinox. Meeting the 75% goal was deemed to be plausible if daylight measures embraced, though exceeding this level was highly unlikely given the depth of the building floorplate. Daylight availability in the basement was reviewed but it this metric was only applied to those floors located above grade where daylight was readily available. The LEED metric is not a suitable metric to judge the daylighting performance of building floors below grade
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