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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 /> SDA Homes Gary Nash @ Nash&Asso Architects <br /> Unit 1-Everett Townhomes (425)828-4117 x7489 <br /> gary@Nash-Architects.com <br /> Heating System Type: ® All Other Systems Q Heat Pump <br /> To see detailed instructions for each section,place your cursor on the word"Instructions". <br /> Design Temperature <br /> Design Temperature Difference(AT) 49 <br /> Everett Paine AFB • AT=Indoor(70 degrees)-Outdoor Design Temp <br /> Area of Building <br /> Conditioned Floor Area <br /> Conditioned Floor Area(sq ft) 1,148 <br /> Average Ceiling Height Conditioned Volume <br /> Average Ceiling Height(ft) 8.1 9,276 <br /> Glazing and Doors U-Factor X Area = UA <br /> 0.30 170 51.00 <br /> Skylights U-Factor X Area = UA <br /> 0.50 <br /> Insulation <br /> Attic U-Factor X Area = UA <br /> R-49 • 0.026 567 14.74 <br /> Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA <br /> Select R-Value • No selection --- <br /> Above Grade Walls(see Figure 1) U-Factor X Area UA <br /> R-21 Intermediate • 0.056 1,691 94.70 <br /> Floors U-Factor X Area UA <br /> R-30 . 0.029 481 13.95 <br /> Below Grade Walls(see Figure 1) U-Factor X Area UA <br /> Select R-value • No selection --- <br /> Slab Below Grade(see Figure 1) F-Factor X Length UA <br /> Select conditioning • No selection --- <br /> Slab on Grade(see Figure 1) F-Factor X Length UA <br /> R-10 Perimeter • 0.540 38 20.70 <br /> Location of Ducts <br /> Duct Leakage Coefficient <br /> Unconditioned Space • <br /> 1.10 <br /> Sum of UA 195.09 <br /> Envelope Heat Load 9,560 Btu/Hour <br /> Figure 1. Sum of UAX AT <br /> Air Leakage Heat Load 4,909 Btu/Hour <br /> VolumeX 0.6X AT X.018 <br /> Above Grade Building Design Heat Load 14,468 Btu/Hour <br /> Air Leakage+Envelope Heat Loss <br /> seww Grade Building and Duct Heat Load 15,915 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 22,281 Btu/Hour <br /> Building and Duct Heat Loss X 1.40 for Forced Air Fumace <br /> Building and Duct Heal ss X 1.25 for Heat Pump <br /> '/ (07/01/13) <br />