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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 /> O •. <br /> PIam�243S <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.Nr: • AT=Indoor(70 degrees)-Outdoor Design Temp <br /> Area of Building <br /> Conditioned Floor Area <br /> Instructions Conditioned Floor Area(sq ft) 2,435 <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 4313;" 131.40 <br /> Insulation <br /> Attic U-Factor X Area = UA <br /> Instructions R-49 0.026 996" 25.90 <br /> Single Rafter or Joist Vaulted Ceilings U-Factor Area UA <br /> Instructions m,.�._...,. <br /> No Vaulted Ceilings in this project <br /> Above Grade Walls(see Figure t) U-Factor Area UA <br /> Instructions j 0.056 2,500 140.00 <br /> t IR21 <br /> Floors U-Factor Area UA <br /> Instructions 101 R-30 0.029 470 13.63 <br /> Below Grade Walls(see Figure•p U-Factor Area UA <br /> Instructions — — •' <br /> 111111 011111110100K-- <br /> No Below Grade Walls In this project. V i <br /> Slab Below Grade(see Figure 1) F-Factor Length UA <br /> instructions <br /> No Slab Below Grade In this project '► `.' <br /> Slab on Grade(see Figure 1) F-Factor Length UA <br /> Instructions --- 0.540 82 44.28 <br /> v i.o Perimeter <br /> Or .._ ._. <br /> Location of Ducts <br /> Instructions <br /> Duct Leakage Coefficient <br /> s Unconditioned Space q1.10 <br /> Sum of UA 355.21 <br /> Envelope Heat Load 16,339 Btu I Hour <br /> Figure 1. Sum ofUAXAT <br /> Air Leakage Heat Load 10,283 Btu/Hour <br /> Volume X 0.6 X AT X 018 <br /> Building Design Heat Load 26,622 Btu/Hour <br /> 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 X1 <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 <br />