ENERGY 3-2018 Heating System Sizing Worksheet-BLDG 1(07/01/13)
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.
Project Information Contact Information
YELM APTS JERRY SCHUUR
BLDG 1 PO BOX 597 PUYALLUP, WA 98371
UNIT D- ALL 8 UNITS
Heating System Type:
To see detailed instructions for each section, place your cursor on the word "Instructions"
Design Temperature
Instructions Design Temperature Difference (∆T)53
∆T = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)1,040
Average Ceiling Height Conditioned Volume
Instructions Average Ceiling Height (ft)9.0 9,360
Glazing and Doors U-Factor X Area =UA
Instructions 0.280 140 39.20
Skylights U-Factor X Area =UA
Instructions 0.50 ---
Insulation
Attic U-Factor X Area =UA
Instructions 0.026 1,040 27.04
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 0.056 928 51.97
Floors U-Factor X Area UA
Instructions No selection ---
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 0.540 136 73.44
Location of Ducts
Instructions Duct Leakage Coefficient
1.00
Sum of UA 191.65
Envelope Heat Load 10,157 Btu / Hour
Sum of UA x ∆T
Air Leakage Heat Load 5,358 Btu / Hour
Volume x 0.6 x ∆T x 0.018
Building Design Heat Load 15,515 Btu / Hour
Air leakage + envelope heat loss
Building and Duct Heat Load 15,515 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 19,394 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
Above Grade
Below Grade
Figure 1.
All Other Systems Heat Pump
Lacey
No Ducts
R-10 Perimeter
Select conditioning
Select R-value
Select R-Value
R-21 Intermediate
Select R-Value
R-49
U-0.28