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Generate Weather Files for SkyCalc: Simplified Options for Building Models

This guide outlines the process for generating weather files for the SkyCalc skylighting spreadsheet. Users can select between simulating a new or pre-existing building model with multiple input pages. Key features include selecting climate files based on California climate zones, U.S. locations, or user-uploaded files. The energy code compliance option allows for ASHRAE standards or California Title 24, facilitating accurate roof U-factor selection. Download SkyCalc at the provided links for efficient building energy performance simulation.

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Generate Weather Files for SkyCalc: Simplified Options for Building Models

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  1. Start-up Options • Two primary choices • Simulate a new or pre-existing building model • Multiple pages of inputs • Create a weather file for the SkyCalc skylighting spreadsheet • One page of inputs

  2. Generating weather files for SkyCalc3 • SkyCalc3 available to download at www.energydesignresources.comwww.h-m-g.com • Select climate file, energy code, and roof U-factor to generate a SkyCalc Weather file

  3. Generating weather files for SkyCalc3 • Building Location – Coverage Select the weather file set. There are three choices for this input: • "California/Title24" limits the weather file choices to the sixteen California climate zones • "All eQUEST Locations“ provides U.S.-wide weather file choices • "User Selected" allows the user to browse his/her machine/network for any standard DOE-2 weather file

  4. Generating weather files for SkyCalc3 • Building Location – Region/City Select the weather region and city. • Region lists the sixteen California climate zones or the 50 U.S. states, plus Canada, the Pacific Islands, Puerto Rico, and the Virgin Islands :

  5. Generating weather files for SkyCalc3 • Energy Code Select the Compliance code for the location. • 2005 California Title24 - provides climate zone choices of sixteen California climate zones. • ASHRAE 90.1-2004 - provides climate zone choices of eight ASHRAE 90.1 climate zones

  6. Generating weather files for SkyCalc3 • Climate Zone Select the Climate zone for the energy code.This input is used to calculate the default roof U-factor. • The default selection for the California Title-24 energy code is based on the Region selected by the user and the default ASHRAE climate zone is selected based on a mapping of city (selected by the user) to HDD and CDD values

  7. Generating weather files for SkyCalc3 • Roof Type Select the type of roof. Displayed only if Energy Code = “ASHRAE 90.1-2004”. • Choose from one of the three roof types, or specify a custom U-factor

  8. Generating weather files for SkyCalc3 • Roof U-factor Input the roof U-factor. • A default U-factor is provided based on previous inputs. User may change the Roof U-factor here. • The maximum allowed U-factor as per the selected energy code, climate zone and roof type, is reported on the side for reference. • Note: Roof U-factor can also be changed in SkyCalc, however choosing the correct U-factor at the creation of the weather file will ensure more accuracy.

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