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Simple Heating System Size: Washington State This heating system sizing calculator is based on the Prescriptive Requirements of the 2018 Washington State Energy Code(WSEC)and ACCA Manuals J and S.This tool will calculate heating loads only.ACCA procedures for sizing cooling systems should be used to determine cooling loads. Please complete the green drop-downs and boxes that are applicable to your project.As you make selections in the drop-downs for each section,some values will be calculated for you.If you do not see the selection you need in the drop-down options,please contact the WSU Energy Program at energycode@energy.wsu.edu or(360)956-2042 for assistance. Project Information Contact Information Hong Property 0 All Other Systems Qe Heat Pump To see detailed instructions for each section,place your cursor on the word"Instructions" Design Temperature Instructions Design Temperature Difference(AT) 49 Everett✓are.AFEi • A T=Indoor(70 degrees).Outdoor Design Temp e. n4 r-t Hir-inr, Conditioned Floor Area iu5truc:t; Conditioned Floor Area(sq ft) 1.080 Average Ceiling Height Conditioned Volume Instructions Average Ceiling Height(ft) 8.0 8,640 Glazing and Dr- U-Factor X Area = UA Instructions u•o.3o . 0.300 144 43.20 Skylights U-Factor X Area = UA Instructions 0.50 Insulation Awe U-Factor X Area = UA Instructions I R-49 ♦ 0.026 1,080 28.08 Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA Instructions ,u vanfec Ce riy5 rn this pi„lent ♦ "" _ Above Grade Wails(see Figure 1) U-Factor X Area UA Instructions R.7t intennedate • 0.056 1,056 59.14 Floors U-Factor X Area UA Instructions 1t-30 ♦ 0.029 1,080 31.32 Below Grade Walls(see Figural) U-Factor X Area UA No Below Grade Walls in this project • 0.028 _ Slab Below Grade(see Figure 1) F-Factor X Len UA ho Sian Below Grade in this project. • 0.303 --- Slab on Grade(see Figure 1) F-Factor X Length UA t:c SIa7 a ,'.r:7e i th s prolec-_ ♦ Location of Ducts, Instruction` Duct Leakage Coefficient Unconditioned Space ♦ 1.10 Sum of UA 161.74 Envelope Heat Load 7,925 Btu/Hour Figural. Sum of UA x AT Air Leakage Heat Load 4,572 Btu/Hour Volumes- 0.6 x AT x 0.018 • Above Grade Building Design Heat Load 12,497 Btu/Hour Air leakage+envelope heat loss Building and Duct Heat Load 13,747 Btu/Hour Ducts in unconditioned space:sum of building heat loss x 1.10 Ducts in conditioned space:sum of building heat loss x 1 Maximum Heat Equipment Output 17,184 Btu/Hour Building and duct heat loss x 1.40 for forced air furnace Building and duct heat loss x 1.25 for heat pump (07/01/13)