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Simple Heating System Size: Washington State <br />This heating system sizing calculator is based on the Prescriptive Requirements of the 2015 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 />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 />Dosunmu AFH Addition <br />Heating System Type: o All Other systems O 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) <br />ell IC <br />AT =Indoor (70 degrees) -Outdoor Design Temp <br />Area of Building <br />Conditioned Floor Area <br />Conditioned Floor Area (sq ft) <br />3,587 <br />Average Ceiling Height <br />Conditioned Volume <br />Average Ceiling Height (ft) <br />8.4 <br />29,951 <br />Glazing and Doors <br />U-Factor <br />X Area = <br />UA <br />­28 <br />.. <br />0.280 <br />424 <br />118.66 <br />SkVlights <br />U-Factor <br />X Area = <br />UA <br />0.50 <br />o <br />--- <br />Insulation <br />Attic <br />U-Factor <br />X Area = <br />UA <br />0.026 <br />1,434 <br />37.28 <br />Single Rafter or Joist Vaulted Ceilings <br />U-Factor <br />X Area <br />UA <br />0.027 <br />80 <br />2.16 <br />Above Grade Walls (see Route n <br />U-Factor <br />X Area <br />UA <br />0.056 <br />2,780 <br />155.68 <br />Floors <br />U-Factor <br />X Area <br />UA <br />N 38 <br />0.025 <br />777 <br />19.43 <br />Below Grade Walls (see Figure 1) <br />U-Factor <br />X Area <br />UA <br />0.042 <br />305 <br />12.81 <br />-•:cam u�t�._s���..i <br />Slab Below Grade (seeFiourel) <br />F-Factor <br />X Length <br />UA <br />N.i M1emuf 8 eat L ab edge <br />0.570 <br />61 <br />34.77 <br />Slab on Grade (see Figure 'r) <br />F-Factor <br />X Length <br />UA <br />N ,u N. ,,,n . <br />.9 <br />0.540 <br />83 <br />44.82 <br />Location of Ducts <br />Duct Leakage Coefficient <br />lln[nnf S, <br />m <br />�- <br />1.10 <br />Sum of UA <br />425.61 <br />Figure 1. <br />Abolre Grade <br />47 <br />Envelope Heat Load 20,004 Btu / Hour <br />Sum of UA X AT <br />Air Leakage Heat Load 15,203 Btu / Hour <br />volume x 0.6 X AT X .018 <br />Building Design Heat Load 35,207 Btu / Hour <br />Air Leakage + Envelope Heat Loss <br />Building and Duct Heat Load 38,728 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 54,219 Btu I 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 />