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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 /> • Robinett Residence Bill Langus 425-293-5852 <br /> Heating System Type: O iI Other Systems ta-teat Pump <br /> To see detailed instructions for each section,place your cursor on the word"Instructions". <br /> Design Temperature <br /> Instructions £ -- — Design Temperature Difference(AT) 47 <br /> • r 1 Everett JC • <br /> y. AT=Indoor(70 degrees)-Outdoor Design Temp <br /> ,77 <br /> Area of Building <br /> Conditioned Floor Area <br /> • Instructions Conditioned Floor Area(sq ft) 6,847 <br /> Average Ceiling Height Conditioned Volume <br /> Instructions Average Ceiling Height(ft) 9.7 66,416 <br /> Glazing and Doors U-Factor X Area = UA <br /> Instructions <br /> 0.30 1,438 431.40 <br /> Skylights U-Factor X Area = UA <br /> Instructions 0.50 <br /> Insulation <br /> Attic U-Factor X Area = UA <br /> Instructions I R_49w 0.026 3,456 89.86 <br /> Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA <br /> Instructions No selection <br /> Select R Value w <br /> Above Grade Walls(see Figure 1) U-Factor X Area UA <br /> Instructions R-21lntermediate 0.056 3,382 189.39 <br /> Floors U-Factor X Area UA <br /> • <br /> Instructions R 30 0.029 3,629 105.24 <br /> _ <br /> Below Grade Walls(see Figure'', U-Factor X Area UA • <br /> Instructions t <br /> R 21 Interior � <br /> 1` ,1 1 0.042 1,656 69.55 <br /> 1tiF',dr�1x .a»„5 <br /> Slab Below Grade(see Figure 1) F-Factor X Len•th UA <br /> Instructions i 0.570 184 104.88 <br /> R S Thermal Break at slab edge <br /> Slab on Grade(see Figure 1) F-Factor X Len•th UA <br /> Instructions ;�R 10 Perimeter V =r <br /> 0.540 184 99.36 <br /> T-� 1 Y`Location of Ducts <br /> Instructions __.._._...._.._.__. _.__.......____—_ _ ____ Duct Leakage Coefficient <br /> Unconditioned Space <br /> 1.10 <br /> Sum of UA 1089.68 <br /> Envelope Heat Load 51,215 Btu/Hour <br /> Figure 1. Sum of UA X AT <br /> Air Leakage Heat Load 33,713 Btu/Hour <br /> Volume X 0.6 X AT X.018 <br /> Above Grade Building Design Heat Load 84,928 Btu/Hour <br /> A Air Leakage+Envelope Heat Loss <br /> Building and Duct Heat Load 93,420 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 116,776 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 /> • <br /> / / y (07/01/13) <br /> (t/J 1 <br />