SPS-H4H_Yelm-1345_250526_2021-WSEC_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 Deisgn Temperature 17
Instructions Lacey Design Temperature Difference (∆T) 53
∆T = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft) 1,198
Average Ceiling Height Conditioned Volume
Instructions Average Ceiling Height (ft) 8.5 10,183
Glazing and Doors U-Factor X Area = UA
Instructions U-0.25 0.250 235 58.75
Skylights U-Factor X Area = UA
Instructions 0.50 0 0.00
Insulation
Attic U-Factor X Area = UA
Instructions R-60 0.024 680 16.32
Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA
Instructions No Vaulted Ceilings in this project.-----
Above Grade Walls (see Figure 1)U-Factor X Area UA
Instructions R-20 STD +R-5 ci 0.045 1,198 53.91
Floors U-Factor X Area UA
Instructions No Floors above unconditioned spaces.-----
Below Grade Walls and Slabs (see Figure 1)Wall U-Factor X Area UA
Instructions None ----
Select nearest slab depth Slab F-Factor X Length UA
----
Slab on Grade (see Figure 1)F-Factor X Length UA
Instructions R-10 Fully Insulated 0.360 111 39.96
Location of Ducts
Instructions Conditioned Space Duct Leakage Coefficient
1.000
Sum of UA 168.94
Envelope Heat Load 8,954 Btu / Hour
Sum of UA x ∆T
Air Leakage Heat Load 5,829 Btu / Hour
Volume x 0.6 x ∆T x 0.018
Building Design Heat Load 14,783 Btu / Hour
Air leakage + envelope heat loss
Building and Duct Heat Load 14,783 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 18,478 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
Wall & Slab
Depth
This heating system sizing calculator is based on the Prescriptive Requirements of the 2018 and 2021 Washington State Energy Code (WSEC) . 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.
SPS Habitat for Humanity - 1345 Townhome
Longmire St SE
Yelm, WA 98597
Jason Taellious o.b.o. Artisans Group Architecture
jason@artisansgroup.com
206.639.7098
This tool is for the permitting purposes only. A Manual J calculation is required to meet the requirement of the Washington State Energy Code.
Above Grade
Below Grade
Figure 1.
All Other Systems Heat Pump
(07/01/13)