REVIEWED BLD2023-0460+HEATING +4.12.2023_5.09.10_PM+3480124BLD2023-0460
Simple Heating System Size: Washington State
This heating system sizing calculator is based on the Prescriptive Requirements of the 2018 Washington State Energy Code (WSEC) and ACCA
Manuals J and S. 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.
REVIEWED
BY
CITY OF EDMONDS
Protect Information ilontact Information
Erika and Trevor Hill IHeidiHelgeson/H2D Architecture+ Design
931 Carol Way 23020 Edmonds Way, #113
Edmonds, WA 98020 1 Edmonds, WA 98020
Heating System Type: O All Other Systems OO Heat Pump RECEIVED
To see detailed instructions for each section, place your cursor on the word "Instructions"
Design Temperature
Instructions Design Temperature Difference (AT)
Edmonds AT = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)
3,213
Average Ceiling Height
Conditioned Volume
Instructions Average Ceiling Height (ft)
7.9
25,379
Glazing and Doors
U-Factor
X Area =
UA
Instructions
U-0.30
.
0.300
J
749
224.79
Skylights
U-Factor
X Area =
UA
Instructions
0.50
54
27.00
Insulation
Attic
U-Factor
X Area =
UA
Instructions R-49
I 0.026
1
2,320
60.33
Single Rafter or Joist Vaulted Ceilings
U-Factor
X Area
UA
Instructions 6 R-38 vented
I 0.027
739
19.95
Above Grade Walls (see Figure 1)
U-Factor
X Area
UA
Instructions
0.056
2,063
115.51
L R-21 Intermediate
Floors
U-Factor
X Area
UA
Instructions
0.029
519
15.04
R-30
�
Below Grade Walls (see Figure 1)
U-Factor
X Area
UA
Instructions
Select R-value
I No selection
J
400
Slab Below Grade (see Figure 1)
F-Factor
X Length
UA
Instructions
No Slab Below Grade in this project.
�
0.000
---
Slab on Grade (see Figure n
F-Factor
X Length
UA
Instructions No Slab on Grad e in this project.
�
---
Location of Ducts
Instructions
Duct Leakage Coefficient
Conditioned Space
I
1.00
Sum of UA
462.62
Figure 1.
Above Grade
Apr 14 2023
46 CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
Envelope Heat Load 21,280
Btu / Hour
Sum of UA x AT
Air Leakage Heat Load 12,608
Btu / Hour
Volume x 0.6 x AT x 0.018
Building Design Heat Load 33,889
Btu / Hour
Air leakage + envelope heat loss
Building and Duct Heat Load 33,889
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 42,361
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
(07/01/13)