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2019.0509 2506-3T Heating_System_Sizing_WorksheetSimple Heating System Size: Washington State Project Information Contact Information Heating System Type: To see detailed instructions for each section, place your cursor on the word "Instructions". Design Temperature Instructions Design Temperature Difference (∆T)53 ∆T = Indoor (70 degrees) - Outdoor Design Temp Area of Building Conditioned Floor Area Instructions Conditioned Floor Area (sq ft)2,506 Average Ceiling Height Conditioned Volume Instructions Average Ceiling Height (ft)8.5 21,301 Glazing and Doors U-Factor X Area =UA Instructions 0.280 330 92.40 Skylights U-Factor X Area =UA Instructions 0.50 0 --- Insulation Attic U-Factor X Area =UA Instructions 0.026 1,672 43.47 Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA Instructions 0.027 110 2.97 Above Grade Walls (see Figure 1)U-Factor X Area UA Instructions 0.056 2,674 149.74 Floors U-Factor X Area UA Instructions No selection 1,057 ________ Below Grade Walls (see Figure 1)U-Factor X Area UA Instructions No selection --- Slab Below Grade (see Figure 1)F-Factor X Length UA Instructions No selection --- Slab on Grade (see Figure 1)F-Factor X Length UA Instructions No selection --- Location of Ducts Instructions Duct Leakage Coefficient 1.10 Sum of UA 288.59 Envelope Heat Load 15,295 Btu / Hour Sum of UA X ∆T Air Leakage Heat Load 12,193 Btu / Hour Volume X 0.6 X ∆T X .018 Building Design Heat Load 27,488 Btu / Hour Air Leakage + Envelope Heat Loss Building and Duct Heat Load 30,237 Btu / Hour Ducts in unconditioned space: Sum of Building Heat Loss X 1.10 Ducts in conditioned space: Sum of Building Heat Loss X 1 Maximum Heat Equipment Output 42,331 Btu / Hour Building and Duct Heat Loss X 1.40 for Forced Air Furnace Building and Duct Heat Loss X 1.25 for Heat Pump This heating system sizing calculator is based on the Prescriptive Requirements of the 2015 Washington State Energy Code (WSEC) and ACCA Manuals J and S. This calculator will calculate heating loads only. ACCA procedures for sizing cooling systems should be used to determine cooling loads. Please fill out all of 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 call the WSU Energy Extension Program at (360) 956-2042 for assistance. MOUNTAIN TERRACE BUILDERS 2506-3T LEVEL DESIGN LLC 253 284-3170 Above Grade Below Grade Figure 1. All Other Systems Heat Pump (07/01/13)