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04-13-15-R
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04-13-15-R
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4/13/2015 1:58:39 PM
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TCAAP Energy Integration Resiliency Framework <br />Energy Efficiency Strategies <br /> <br /> <br /> 65 <br />4.3.2. Building orientation and passive solar <br /> <br />The TCAAP Policy White Paper included the recommendations for the TCAAP subdivision review <br />process to assess the energy implications of street and building orientation on solar heat gain and loss. <br />Beyond the building envelope, street orientation, lot and building orientation, and building massing, all <br />impact the thermal loads of homes and commercial buildings. By jointly considering these variables <br />prior to the subdivision process, planners and developers have the opportunity to make tradeoff <br />decisions while still producing efficient results. Site orientation is potentially a no-cost way to reduce <br />building energy loads and improve daylighting when considered in site planning. <br />In line with solar oriented design, homes should be designed and sited so that the longest sides of a <br />house face south and southern faces have the greatest window area.14 This general window <br />orientation is a proven strategy to reduce a home’s heating energy by approximately 4% and cooling <br />costs by 2%, without affecting any other parts of the design. Figure 11 shows the energy savings <br />achieved from southern window orientation, assuming that the largest exterior walls are facing north <br />and south, but without optimizing any other window characteristics or the window to wall ratio on <br />each side. <br />Alone, window orientation results in moderate energy savings, but when paired with improved <br />window insulation, higher solar heat gain coefficients, and optimum window to wall ratios, the heating <br />energy savings will be 20% to 30%.15 Proper building and window orientation magnify the impact of the <br />remaining window decision. When aligned, homes with a well-insulated double or triple pane windows <br /> <br />14http://www.energy.ca.gov/title24/2013standards/prerulemaking/documents/current/Reports/Residential/Water_Heating/2013_CASE <br />_R_Solar_Ready_Solar_Oriented_Developments_Sept_2011.pdf <br />15 http://www.efficientwindows.org/downloads/ColdDesignGuide.pdf <br />Recommendation: <br />The process for solar oriented development should be described in residential and commercial <br />building RFPs and should be integrated as evaluation criteria for development proposals. It should <br />be evaluated based on lowest total energy load of the homes or buildings to be sited under one <br />proposal and should consider street orientation, building orientation, and passive solar building <br />envelope design elements. As part of the platting process, the County could plat the land and <br />maximize building orientation prior to sale to developers.
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