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Simple Heating System Size: Washington State This heating system sizing calculator is based on the Prescriptive Requirements of the 2018 Washington State Energy Code (WSEC) and ACCA Manuals J and S. This tool will calculate heating loads only ACCA procedures for sizing cooling systems should be used to determine cooling loads. Please complete the green drop -downs and boxes that are applicable to your project. As you make selections in the drop -downs for each section, some values will be calculated for you. If you do not see the selection you need in the drop -down options, please contact the WSU Energy Program at energycode@energy.wsu edu or (360) 956-2042 for assistance Project Information Contact Information A 8r P Holding Mark Anderson 0 Nash Bt Asso Archttects 79th PL NE, Granite Falls (425) 242-7491 _ 04 13 1. Heatinu System Type: O All Other Systems OO Heat Pump To see detailed instructions for each section, place your cursor on the word "Instructions' Design -temperature _ Design Temperature Difference (AT) �a''"'•�� AT = indoor (70 degrees) - Outdoor Design Temp �A Rlfikhno Conditioned Floor Area Conditioned Floor Area (sq ft) 1.744 Average Ceiling Height Conditioned Volume ' " Average Ceiling Height (ft) 8.4 14,702 Glazing and Doors U-Factor X Area = UA u-oze 0 280 316 88.14 Skylights U-Factor X Area = UA 150 Insulation Attic U-Factor X Area = UA R-49 . 0.026 926 24.08 Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA n .,•, ;.;,.•: ,;,,, 0.020 216 4.32 Above Grade Walls (see Figure t) U-Factor X Area UA R-21 intermediate • 0.056 1,934 108.32 Floors U-Factor X Area UA 0,025 1,142 J 28.55 R 38 Below Grade Walls rseeFiaure+) U-Factor X Area UA Select R-value • No selection --- Stab Below Grade rsee Figure n F-Factor X Lenpth UA Select conditioning I No selection tf'conditioning• -- Slab on Grade (see Figure n F-Factor X Length UA Select R•value 2:m...o • No selection Location of Ducts Duct Leakage Coefficient Unconditioned Space • 1.10 Figure 1 .�bc.e Giutc 47 Sum of UA 253,41 Envelope Heat Load 11,910 Btu/Hour Sum of UA x AT Air Leakage Heat Load 7,463 Btu / Hour Volumex 0.6xATx0.016 Building Design Heat Load 19,373 Btu I Hour Air leakage + envelope heat loss Building and Duct Heat Load 21,310 Btu / Hour Ducts in unconditioned space: sum of buildinq heat loss x 1.10 Ducts in conditioned space: sum of building heat loss x 1 Maximum Heat Equipment Output 26,638 Btu / Hour Buildinq and duct heal loss x 1-40 for forced air furnace Buildinq and duct hea s x 1.25 for heat pump (07101113)