HVAC system for residential multi-generational home design similar to a duplex with center breezeway access to gallery main entrance.

HVAC system design needed for 2,736 sqft home over two floors.

1st floor 1,368
Attic Storage room (2nd floor) 1,368/sf

Overview: Residential multi-generational home design similar to a duplex with center breezeway access to gallery main entrance.

Home design basics are based on energy star and green building standards as outlined at www.energystar.gov .

Our design concept is to have two (2) independent HVAC systems due to the homes layout.

The home is designed based on a fully insulated envelope placing all HVAC equipment within conditioned space and mostly center to the structure.

Well need the following:

  1. Load calculations
  2. Equipment selection and sizing
  3. Distribution design

1st Floor

  1. Outside walls, 2x6x9' 1/2" drywall R15 insulation
  2. Ceiling 1/2" drywall open BIC-90 16" I-Joists on center
  3. Floor open crawlspace 4' above concrete slab no wind blocking R15 insulation 1 1/8" sub-floor
  4. Windows 6 low-E Argon tinted 52x32" 11.5/sf 
  5. Doors 2 metal wood fill 0.14U factor
  6. Door 1 metal 1/4 glass top single wood fill 0.14+ U factor

Attic Storage

  1. Outside walls, 2x6x6' external front and rear walls insulated R-15 connecting to rafters BCI-6000s I-Joists.
  2. Roof rafters are open ceiling with R-30 insulation.
  3. Floor 3/4" sub-floor decking no insulation in BIC-90 16" I-Joists to allow thermal transfer
  4. Shingles are slate color asphalt
  5. Gable walls from insulated from pony wall to ridge beam 6/12 roof pitch (26.57 degrees) pitch

Outside walls North

  1. 540 sq. ft. of North facing outside walls
  2. 34.5/sf windows  
  3. 20.5/sf doors
  4. Eave/porch 10' sun mid summer mid window 4' of 36' wall 4 hours 4pm to 8pm.
  5. R-15 2x6 16oc cement board siding

Outside walls South

  1. 540 sq. ft. of South facing outside walls
  2. 5.8/sf windows
  3. 41/sf doors
  4. Eave/porch roof 10' sun early morning summer mid door 4' cover over 36' wall 4 hours 6am to 10am
  5. R-15 2x6 16oc cement board siding

Outside walls East

  1. 552 sq. ft. of East facing outside wall area.
  2. 46/sf windows
  3. 0/sf doors
  4. No eaves
  5. R-15 2x6 16oc cement board siding

Outside walls West

  1. 552 sq. ft. of West facing outside wall area.
  2. 0/sf windows
  3. 0/sf doors
  4. No eaves
  5. R-15 2x6 16oc cement board siding

We are following green building and energy star processes and may need ANSI / RESNET / ACCA Std. 310 HVAC Design Report with ENERGY STAR Supplement for our rating.

If you need any additional information please respond to the email we sent to you or use 1414 [at] TruckAndTools.Com.
The home is ready for rough-in and we invite you to view the build before completing your design calculations.

Detailed plans are in the documents download of this page named HVAC_MECHANICAL_8-23-2022_v1.2.pdf
DUCT drawings are our vision of what would work keeping as much free floor space in the storage attic.
One designed to condition the attic storage runs offset from the rafters and the second runs in the 16"oc floor joists.

Layman calculations:
Straight Cool 2 stage/variable compressor w/electric heat

  • Total Btu's Cooling 17450
  • Sensible Load 10406
  • Latent Load 7044
  • Total Btu's Heating 17311 

Sizing Calculations Data and Results: 

Load Calculation Data

  • Cooling - Sensible: 10,406 btu's
  • Cooling -  Latent: 7044 btu's
  • Cooling - Total: 17450 btu's
  • Heating - Total: 17311 btu's
  • Sensible Heat Ratio  0.6 

 Sizing Results

  • Cooling - Minimum: 17450 btu's
  • Cooling - Maximum: 20940 btu's
  • Heating - Minimum: 16445 btu's
  • Heating - Maximum: 30294 btu's
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