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Simple Heating System Size: Washington State <br />This heating system sizing calculator is based on the Prescriptive Reauirements of the 2015 Washington State Enerav Code (WSEC) and ACCA <br />Manuals J and S. This calculator will calculate heating loads only. ACCA procedures for sizing cooling systems should be used to determine cooling <br />loads. <br />The glazing (window) and door portion of this calculator assumes the installed glazing and door products have an area weighted average U-factor of <br />0.30. The incorporated insulation requirements are the minimum prescriptive amounts specified by the 2015 WSEC. <br />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, <br />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 <br />Program at (360) 956-2042 for assistance. <br />Project Information Contact Inthrmat3on <br />Loop Resid -New Attached ADU GK Structural Englneerin& LLC <br />1501 Grand Ave 147031st Lane NE, Ste 205 <br />Everett, WA 98201 Duvall, WA 98019 <br />Heatino System Tvpe: cowl Other systems OHeat Pump <br />To see detailed instructions for each section, place your cursor on the word "Instructions". <br />Desion Temperature <br />.!, <tw, llo'l" Design Temperature Difference (AT) 47 <br />r ° a c t t ' C AT - Indoor (70 degrees) - Outdoor Design Temp <br />Area of Building <br />Conditioned Floor Area <br />( 11 'I , Conditioned Floor Area (sq ft) <br />411 <br />Average Ceiling Height <br />Conditioned Volume <br />111',liil..11oll • Average Ceiling Height (ft) <br />9.01 <br />3,699 <br />Glazino and Doors <br />U-Factor <br />X Area = UA <br />0.30 <br />72 21.65 <br />1 li h <br />U-Factor <br />X Area = UA <br />t <br />0.50 <br />0 7:] --- <br />Insulation <br />Attic <br />U-Factor X <br />Area = <br />UA <br />R 49 <br />0.026 <br />411 <br />10.69 <br />Single Rafter or Joist Vaulted Ceilings <br />U-Factor X <br />Area <br />UA <br />Select R Vale <br />. <br />No selection <br />0 <br />-- <br />Above Grade Walls (am Figure 1) <br />U-Factor X <br />Area <br />UA <br />R 21 'ntermea�a;r• <br />� i <br />0.056 <br />742 <br />41.55 <br />Floors <br />U-Factor X <br />Area <br />UA <br />Sdect R Vah.e <br />• <br />� <br />No selection <br />--- <br />Below Grade Wells (see Rgure 1) <br />U-Factor X <br />Area <br />UA <br />Select Rvalue <br />W j <br />No seti lecon <br />0 <br />- <br />Slab Below Grade (am Rgune i) <br />F-Factor X <br />Length <br />UA <br />Select cond.:iorinq <br />t � <br />No selection <br />--- <br />Slab on Grade (see Figure f) <br />F-Factor X <br />Length <br />UA <br />0.540 <br />91 <br />49.14 <br />Location of Ducts <br />Duct Leakage Coefficient <br />tvc• Ducts <br />� i <br />1.00 <br />Figure 1 <br />6AboveGrade <br />Sum of UA <br />123.02 <br />Envelope Heat Load <br />5,782 Btu / Hour <br />Sum of UA X nT <br />Air Leakage Heat Load <br />1,878 Btu / Hour <br />volumeX 0.6XATX.018 <br />Building Design Heat Load <br />7,660 Btu / Hour <br />Air leakage + Envelope Heat Loss <br />Building and Duct Heat Load <br />7,660 Btu / Hour <br />Ducts in unconditioned space: Sum of Building Heat Loss X <br />1.10 <br />Ducts in conditioned space: Sum of Building Heat Loss X 1 <br />Maximum Heat Equipment Output <br />10,724 Btu / Hour <br />Building and Dud Heat Loss X 1.40 for Forced Air Furnace <br />Building and Dud Heat Loss X 1.25 for that Pump <br />(071011.13) <br />