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Simple Heating System Size: Washington State <br /> +This heating system sizing calculator is based on the Prescriptive Requirements of the 2012 Washington State Energy 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 2012 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 Information <br /> ftlani2435 'r <br /> Heating System Type: <br /> To see detailed instructions for each section,place your cursor on the word"Instructions". <br /> Design Temperature <br /> Instructions - ■� Design Temperature Difference(AT) 46 <br /> Lynnwood i t( AT=Indoor(70 degrees)-Outdoor Design Temp <br /> Area of Buildinq <br /> Conditioned Floor Area <br /> Instructions Conditioned Floor Area(sq ft) F7: __ <br /> Average Ceiling Height Conditioned Volume <br /> Instructions Average Ceiling Height(ft) 8;5 20,698 <br /> Glazing and Doors U-Factor X Area = UA <br /> Instructions• 0.30 F74381 131.40 <br /> Insulation <br /> Attic U-Factor X Area = UA <br /> s`ruction> 0.026 99G 25.90 <br /> Single Rafter or Joist Vaulted Ceilings U-Factor Area UA <br /> Instructions M �tiz <br /> No Vaulted Ceilings In this project. <br /> Above Grade Walls(see Figure 1) U-Factor Area UA <br /> Instructions <br /> R-2i ♦, 0.056 2,500 140.00 <br /> Floors U-Factor Area UA <br /> Instructions 30 0.029 470;.• 13.63 <br /> Below Grade Walls(see Figure 1) U-Factor Area UA <br /> Instructions <br /> r►I No Below Grade Walls In this project. !► <br /> AIS <br /> Slab Below Grade(see Figure 1) F-Factor Length UA <br /> Instructions �,.. . _.: <br /> projectL,...„ <br /> No Slab Below Grade In this - <br /> Slab on Grade(see Figure 1) F-Factor Length UA <br /> instructions "'" - 0.54082.�.: 44.28 <br /> R-10 Perimeter F' <br /> Location of Ducts <br /> Instructions _ Duct Leakage Coefficient <br /> Unconditioned Space <br /> 1.10 <br /> Sum of UA 355.21 <br /> Envelope Heat Load 16,339 Btu/Hour <br /> Figure 1. Sum ofUAXAT <br /> Air Leakage Heat Load 10,283 Btu/Hour <br /> VolumeX 0.6XATX.018 <br /> .4oveGrade Building Design Heat Load 26,622 Btu/Hour <br /> ,Atly Air Leakage+Envelope Heat Loss <br /> Building and Duct Heat Load 29,284 Btu/Hour <br /> Ducts in unconditioned space:Sum of Building Heat Loss X 1.10 <br /> Ducts in conditioned space:Sum of Building Heat Loss X 1 <br /> Maximum Heat Equipment Output 40,998 Btu/Hour <br /> Building and Duct Heat Loss X 1.40 for Forced Air Furnace <br /> Building and Duct Heat Loss X 1.25 for Heat Pump <br /> (07/01/13) <br />