20190025 New Heating_System_Sizing_WorksheetSimple Heating System Size: Washington State
Project Information Contact Information
Heating System Type:
To see detailed instructions for each section, place your cursor on the word "Instructions".
Design Temperature
Instructions Design Temperature Difference (∆T) 53
∆T = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft) 2,652
Average Ceiling Height Conditioned Volume
Instructions Average Ceiling Height (ft) 8.5 22,542
Glazing and Doors U-Factor X Area = UA
Instructions 0.280 366 102.48
Skylights U-Factor X Area = UA
Instructions 0.50 ---
Insulation
Attic U-Factor X Area = UA
Instructions 0.026 1,640 42.64
Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA
Instructions ---________
Above Grade Walls (see Figure 1)U-Factor X Area UA
Instructions 0.056 2,351 131.66
Floors U-Factor X Area UA
Instructions 0.025 1,637 40.93
Below Grade Walls (see Figure 1)U-Factor X Area UA
Instructions 0.028 ________
Slab Below Grade (see Figure 1)F-Factor X Length UA
Instructions 0.303 ---
Slab on Grade (see Figure 1)F-Factor X Length UA
Instructions --- ________
Location of Ducts
Instructions Duct Leakage Coefficient
1.10
Sum of UA 317.70
Envelope Heat Load 16,838 Btu / Hour
Sum of UA X ∆T
Air Leakage Heat Load 12,903 Btu / Hour
Volume X 0.6 X ∆T X .018
Building Design Heat Load 29,741 Btu / Hour
Air Leakage + Envelope Heat Loss
Building and Duct Heat Load 32,715 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 45,801 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
This heating system sizing calculator is based on the Prescriptive Requirements of the 2015 Washington State Energy Code (WSEC) and ACCA Manuals
J and S. This calculator will calculate heating loads only. ACCA procedures for sizing cooling systems should be used to determine cooling loads.
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, 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 Program at
(360) 956-2042 for assistance.
Plan 2652 Rueppell
Above Grade
Below Grade
Figure 1.
All Other Systems Heat Pump
(07/01/13)