20190049 2108-2 HeatingSimple 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)2,108
Average Ceiling Height Conditioned Volume
Instructions Average Ceiling Height (ft)9.0 18,972
Glazing and Doors U-Factor X Area =UA
Instructions 0.30 407 122.10
Skylights U-Factor X Area =UA
Instructions 0.50 0 ---
Insulation
Attic U-Factor X Area =UA
Instructions 0.026 1,237 32.16
Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA
Instructions 0.027 ________
Above Grade Walls (see Figure 1)U-Factor X Area UA
Instructions 0.056 2,407 134.79
Floors U-Factor X Area UA
Instructions 0.025 871 21.78
Below Grade Walls (see Figure 1)U-Factor X Area UA
Instructions ---0 ---
Slab Below Grade (see Figure 1)F-Factor X Length UA
Instructions ---0 ________
Slab on Grade (see Figure 1)F-Factor X Length UA
Instructions ---0 ________
Location of Ducts
Instructions Duct Leakage Coefficient
1.00
Sum of UA 310.83
Envelope Heat Load 16,474 Btu / Hour
Sum of UA X ∆T
Air Leakage Heat Load 10,860 Btu / Hour
Volume X 0.6 X ∆T X .018
Building Design Heat Load 27,334 Btu / Hour
Air Leakage + Envelope Heat Loss
Building and Duct Heat Load 27,334 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 38,267 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.
The glazing (window) and door portion of this calculator assumes the installed glazing and door products have an area weighted average U-factor of
0.30. The incorporated insulation requirements are the minimum prescriptive amounts specified by the 2015 WSEC.
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.
2108-2 Level Design LLC
253-284-3170
Above Grade
Below Grade
Figure 1.
All Other Systems Heat Pump
(07/01/13)