2020.0026 2108-2 Heating_System_Sizing_Worksheet - Heating Sizing(07/01/13)
Simple 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
2108-2 LEVEL DESIGN LLC
253 284-3170
Heating System Type:
To see detailed instructions for each section, place your cursor on the word "Instructions".
Design Temperature
Instructions Design Temperature Difference (∆T)53.0
∆T = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)(2,108)
Average Ceiling Height Conditioned Volume
Instructions Average Ceiling Height (ft)8.5 (17,918)
Glazing and Doors U-Factor X Area =UA
Instructions
0.280 (416)116.48
Skylights U-Factor X Area =UA
Instructions 0.50 (0)---
Insulation
Attic U-Factor X Area =UA
Instructions 0.026 (1,288)33.49
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 (2,452)137.31
Floors U-Factor X Area UA
Instructions 0.025 (1,288)32.20
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 319.48
Envelope Heat Load (16,932)Btu / Hour
Sum of UA X ∆T
Air Leakage Heat Load (10,256)Btu / Hour
Volume X 0.6 X ∆T X .018
Building Design Heat Load (27,189)Btu / Hour
Air Leakage + Envelope Heat Loss
Building and Duct Heat Load (29,908)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 (41,871)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