Laserfiche WebLink
SolarMount · Unirac Code-CompliantInstallation.Manual :ELUN[.RAC <br />Part I. Procedure to Determine the Design Wind Load <br />[1.1.] Using the Simplified Method - ASCE 7-05 <br />The procedure to determine Design Wihd Load is specified <br />by the American Sciciery of Civil Engineers and referenced in <br />the International Building Code 2009. For purposes of this <br />document, the values, equations and procedures used in this <br />doctiment refer€!nce ASCE 7-05, Minimum Design Loads for <br />Buildings and Other Structures. Please refer to ASCE 7-05 if <br />you have any questions about' the de.Anitions or procedures <br />presented in this manual. Unirac uses Method 1, the <br />Simplified Method, for calculating the Design Wind Load for <br />pressures on components and eladding in this document. <br />The method described in this document is valid for flush, no <br />tilt, SolarMotint Series applications on either roofs or walls. <br />Flush is defined as panels parallel to the surface (or with no <br />more than 3" difference between ends of assembly) with no <br />more than 10" space between the roof surface, and the bottom <br />ofthe PVpanels. <br />This method is not approved for open structure ca]culations. <br />Applications of these procedures is subjett to the following -- <br />ASCE 7-05 limitations: <br />1. Thebuilding heightmust beless than 60 feet, h < 60. See <br />note for determining h in the next section. For installations <br />on structures greater than 60 feet, contact your local Unirac <br />Distributor. <br />2. The building must be enclosed, not an open or partially <br />enclosed structure, for example a carport. <br />3. The building is regular shaped with no unusual geometrical <br />-irregil·l·.:. ily M 61-'alia] futiia, fui t:cilivle a geodesic dwitte. <br />4. The building is not in an extreme geographic location such <br />as a narrow canyon or steep cliff. <br />5. The building has a flat orgable roof with a pitch less than 45 <br />rlegrepq nra hip roof with.a.pitch-less-than-27-degrees. <br />6. If you f installation does not conform to these requirements <br />please contact your local Unirac distributor or a local <br />professional engineer. <br />I;f your installation is outside the United States or does not <br />meet all of these limitations, consult a local:professional <br />engineer or your local building authority. Consult ASCE 7-05 <br />for more clarificarion on the use of Method I. Lower design <br />wind loads may be obtained by applying Method 11 from ASCE <br />7-05. Consult with a licensed engineer ifyoll want to use <br />Method II procedures. <br />The equation for determihing the Design Wind Load for <br />components and cladding is: <br />pnet (psD = AK21 pnet.30 <br />Pnet (PSD = Design WindLodd <br />A = adjustmentfactorfor building height and exposure tategory <br />Kzt = Topographic Factor at mean roofheight, h (ft) <br />I = Importance Factor <br />pnet30 (psf) = net design wind pressurefor Exposure B, at height <br />= 30feet, 1 = 1.0 <br />You will also need to know the following information: <br />Basic Wind,Speed = V Ohph), the largest 3 second:gust ofwind in <br />the last 50years. <br />h (/0 - total roof heightforflat roof buildings or mean roof <br />heightforpitched roof buildings <br />Roof Pitch (degrees) <br />This manual will help you detefmine: <br />EO:ective WindArea (sj) = minimum total continuous area of <br />modules being installed (Step 2) <br />RoofZone = the area of the roofyou are installi:ng the pvfystem <br />according to Step 3 <br />RoofZone Dimension = a (f-t) (Step 3) <br />Exposure Category (Step 6) <br />[1.2.]Procedure-to-Calculate-TomMjesign-Wind <br />The procedure fordeternuning the Design Wind Load can be <br />broken into st:eps that include looking up several values in <br />different tables. Table 5 has been provided as a;worksheet for <br />the following 9 steps (page 8) <br />Step 1: Determine Basic Wind Speed, V Cmph) <br />Determine the Basic Wind Speed, V (mph) by consulting your <br />local building department or locating your installation on the <br />-maps-in-Figure 1, page 4. <br />Step 2: Determining E#ective WindArea <br />Determine the sma]Iest area ofcontinuous modules yOU Wil] <br />be installing. This is che smallestarea tributary(contributing <br />load) to a support or to a simple-span of rail. That aren is the <br />--Eff@ctive Wind Area, the total area of the fewest number of <br />moduleson a run of,·ails. 1 f thesinallestarea of cotitinuous <br />modules exceeds 100 sq ft, use 100 sq ft (See Table 2). If less, <br />round down to values available in Table 2.