Energy Calculationssimple neating system size: wasningion 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.
Project Information Contact Information
TOLLEFSON LORI TOLLEFSON & PAUL WATKINS
Heating System Type: O All other Systems OO 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 '7 J
AT =Indoor (70 degrees) -Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)
F 798
Average Ceiling Height
Conditioned Volume
Instructions Average Ceiling Height (ft)
9.1
7,262
Glazing and Doors
U-Factor
X Area =
UA
Instructions
u oso
�
J 0.300
218
65.40
Skylights
U-Factor
X Area =
UA
Instructions
0.50
12
6.00
Insulation
Attic
U-Factor
X Area =
UA
Instructions R 4g
I 0.026
J
798
20.75
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-21Intermediate
, 0.056
1,115
62.44
Floors
U-Factor
X Area
UA
Instructions in No Floors
above unconditioned spaces
J
Below Grade Walls (see Figure 1)
U-Factor
X Area
UA
Instructions
No Below Grade Walls in this project.
�
I 0.028
1
00
Slab Below Grade see Figure 11
F-Factor
X Length
UA
InstructionsIN
I 0.303
00
No Slab Below Grade in this project.
�
J
Slab on Grade (see Figure 1)
F-Factor
X Length
UA
Instructions R-10 Fully Insulated
1 0.360
132
47.52
Location of Ducts
Instructions
I Duct Leakage Coefficient
No Ducts
J
1.00
Sum of UA
202.11
Envelope Heat Load 9,297
Btu / Hour
Figure 1. Sum of UA x AT
Air Leakage Heat Load 3,608
Btu / Hour
Volume x 0.6 x AT x 0.018
Above Grade Building Design Heat Load 12,905
Btu / Hour
Air leakage + envelope heat loss
Building and Duct Heat Load 12,905
Btu / Hour
Ducts in unconditioned soace: sum of buildina heat loss x
1.10
Ducts in conditioned space: sum of building heat loss x 1
Maximum Heat Equipment Output 16,131
Btu / Hour
Buildino and duct heat loss x 1.40 for forced air furnace
Buildino and duct heat loss x 1.25 for heat puma
(07101113)