Published: Jan 2009
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THE GOAL OF THE PROPOSED CHAPTER IS THE presentation of climatic loading information appropriate for the hygrothermal (heat, air, and moisture) design and analysis of building enclosures (primarily above-grade walls, windows, and roofs). Building design professionals currently have very little guidance about regionally varying hygrothermal loads (such as driving rain, solar radiation, and night sky cooling) for enclosures. The result is often inappropriate enclosure designs or products for some climates, which result in rot, mold, corrosion, decay, freeze-thaw, and other damage. The growing use of computer-based building enclosure models also demands more and different climate information. Although it is both the difference and absolute value of the exterior and interior conditions that influence the load on the enclosure, this chapter will focus on the exterior conditions. The interior and exterior environmental conditions can conveniently be studied as separate entities, but it must be borne in mind that internal activities and processes can have a significant impact on the interior environment (e.g., stack effect pressures and interior humidity) and they combine with exterior conditions to create the difference that is the load on building enclosures.
Straube, John F.
Building Science Corp., Westford, CT