REVIEWED BLD BLD2020-0564+Energy_Calculations+6.2.2020_11.06.48_AMSimple Heating System Size: Washington State
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.
Project Information Contact Information
LARSEN RESIDENCE H2D ARCHITECTURE + DESIGN
7529 158TH ST SW 23020 EDMONDS WAY #113
EDMONDS, WA98026 7M EDMONDS, WA98020
Heating System Type: C All Other Systems 0 Heat Pump
To see detailed instructions for each section, place your cursor on the word 'Instructions".
Design Temperature
instructions - Design Temperature Difference (AT)
Seattle: Sea-Tac AP AT = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)
4,252
Average Ceiling Height
Conditioned Volume
Instructions Average Ceiling Height (ft)
8.5
36,139
Glazing and Doors
U-Factor
X Area =
UA
Instructions
u-0.28
0.280
960
268.80
Skylights
U-Factor
X Area =
UA
Instructions
0.50
Eo
Insulation
Attic
U-Factor
X Area =
UA
Instructions select R-value
No selection
Eo —1
---
Single Rafter or Joist Vaulted Ceilings
U-Factor
X Area
UA
Instructions R-38 vented _�
0.027
3,225
87.07
Above Grade Walls (see Figure i)
U-Factor
X Area
UA
Instructions R-21 intermediate `�
0.056
4,449
249.15
Floors
U-Factor
X Area
UA
Instructions R-38 ' J
0.025
1,267
31.68
Below Grade Walls (see Figure i)
U-Factor
X Area
UA
Instructions R-21 Interior
0.042
685
28.77
Slab Below Grade see Fi ure t
F-Factor
X Length
UA
Instructions
No slab Below Grade in this project.
0.303
---
Slab on Grade (see Figure 1)
F-Factor
X Length
UA
Instructions R-to Fully Insulated
0.360
163
58.79
Location of Ducts
Instructions
Duct Leakage Coefficient
Unconditioned Space 7
1.10
Sum
of UA
724.25
Figure 1.
Above Grade
46
Envelope Heat Load
33,315
Btu/Hour
Sum of UA X AT
Air Leakage Heat Load
17,954
Btu / Hour
Volume X 0.6 X AT X .018
Building Design Heat Load
51,270
Btu / Hour
Air Leakage + Envelope Heat Loss
Building and Duct Heat Load
56,397
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
70,496
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
(07101113)