REVIEWED BLD BLD2021-0047+Heating Calcs+1.13.2021_1.29.25_PM+1988306Simple 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
ERIC AND JOIE GOODMAN H2D ARCHITECTURE & DESIGN
8010181ST PLSW, EDMONDS, WA98026 HEIDI HELGESON: 206-542-3734
EJOSEPHGOODMAN@GMAIL.COM HEIDI@H2DARCHITECTS.COM
Heating System Type: O All Other Systems O Heat Pump
To see detailed instructions for each section, place your cursor on the word 'Instructions".
Design Temperature
Instructions Design Temperature Difference (AT) 46
Edmonds
AT =Indoor (70 degrees) -Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)
Average Ceiling Height
Instructions Average Ceiling Height (ft)
Glazing and Doors
Instructions j
U-0.30 �
Skylights
Instructions
Insulation
Attic
Instructions R-49
Single Rafter or Joist Vaulted Ceilings
Instructions R-38 Vented
Above Grade Walls (see Figure 1)
Instructions R-21lntennediate
�l
Floors
Instructions
Select R-Value
� a�
Below Grade Walls (see Figure 1)
Instructions No Below Grade Walls in this project.
_I
Slab Below Grade see Figure 1
Instructions
No Slab Below Grade in this project.
Slab on Grade (see Fi ure 1)
Instructions fo
Slab on Grade in this project.
Location of Ducts
Instructions
Conditioned Space
Figure 1.
Above Grade
Conditioned Volume
7.8
10,285
U-Factor
X Area =
UA
0.300
233
69.93
U-Factor
X Area =
UA
0.50
F 14
7.20
U-Factor
X Area =
UA
0.026
737
19.15
U-Factor
X Area
UA
0.027
F 634
17.13
U-Factor
X Area
UA
0.056
1,136
63.63
U-Factor
X Area
UA
No selection
0
---
U-Factor
X Area
UA
0.028
0
F-Factor
X Length
UA
0.303
0
---
F-Factor
X Length
UA
Sum of UA
Duct Leakage Coefficient
1.00
177.05
Envelope Heat Load
8,144
Btu / Hour
Sum of UA X AT
Air Leakage Heat Load
5,110
Btu/Hour
Volume X 0.6 X AT X .018
Building Design Heat Load
13,254
Btu / Hour
Air Leakage + Envelope Heat Loss
Building and Duct Heat Load
13,254
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
16,567
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)