VS 5 Energy Calcs Plan BPrescriptive Path Single Family 2018WashingtonStateEnergyCode-R 1
45Daylightw/ADU
Prescriptive Path Single Family 2018WashingtonStateEnergyCode-R 2
Efficient Building Envelope
Prescriptive Path Single Family 2018WashingtonStateEnergyCode-R 3
Please print only pages 1 through 3 of this worksheet for submission to your building official.
3.0 CLEAR FORM
Simple 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
Instructions Design Temperature Difference (∆T)41
∆T = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)998
Average Ceiling Height Conditioned Volume
Instructions Average Ceiling Height (ft)8.5 8,483
Glazing and Doors U-Factor X Area =UA
Instructions 0.280 145 40.60
Skylights U-Factor X Area =UA
Instructions 0.50 ---
Insulation
Attic U-Factor X Area =UA
Instructions 0.026 637 16.56
Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA
Instructions No selection ---
Above Grade Walls (see Figure 1)U-Factor X Area UA
Instructions 0.056 1,642 91.95
Floors U-Factor X Area UA
Instructions 0.025 637 15.93
Below Grade Walls (see Figure 1)U-Factor X Area UA
Instructions No selection ---
Slab Below Grade (see Figure 1)F-Factor X Length UA
Instructions No selection ---
Slab on Grade (see Figure 1)F-Factor X Length UA
Instructions No selection ---
Location of Ducts
Instructions Duct Leakage Coefficient
1.10
Sum of UA 165.04
Envelope Heat Load 6,767 Btu / Hour
Sum of UA x ∆T
Air Leakage Heat Load 3,756 Btu / Hour
Volume x 0.6 x ∆T x 0.018
Building Design Heat Load 10,523 Btu / Hour
Air leakage + envelope heat loss
Building and Duct Heat Load 11,575 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 14,469 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
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.
45 Daylight w / ADU Plan B
Above Grade
Below Grade
Figure 1.
All Other Systems Heat Pump
(07/01/13)
Window, Skylight and Door Schedule
Project Information Contact Information
Width Height
Ref.U-factor Qt.Feet Inch Feet Inch Area UA
Exempt Swinging Door (24 sq. ft. max.)0.0 0.00
0.0 0.00
Vertical Fenestration (Windows and doors)
Component Width Height
Description Ref.U-factor Qt.Feet Inch Feet Inch Area UA
0.28 1 3 0 6 8 20.0 5.60
0.28 2 2 0 2 0 8.0 2.24
0.28 1 6 0 5 0 30.0 8.40
0.28 1 4 0 4 0 16.0 4.48
0.28 1 3 0 4 0 12.0 3.36
0.28 1 6 0 4 0 24.0 6.72
0.28 1 2 8 6 8 17.8 4.98
0.28 1 2 8 6 8 17.8 4.98
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.28 0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
45 Daylight w / ADU Plan B
front door
great rm
great rm
kitchen
bedrm 2
bedrm 1
man door
garage man door
Exempt Glazed Fenestration (15 sq. ft. max.)
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
Sum of Vertical Fenestration Area and UA 145.6 40.76
Vertical Fenestration Area Weighted U = UA/Area 0.28
Overhead Glazing (Skylights)
Component Width Height
Description Ref.U-factor Qt.Feet Inch Feet Inch Area UA
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
Sum of Overhead Glazing Area and UA 0.0 0.00
Overhead Glazing Area Weighted U = UA/Area 0.00
145.6 40.76Total Sum of Fenestration Area and UA (for heating system sizing calculations)