Joshua Dimasaka

Journal Entry For
Module 7 - Building Envelope Systems

7.3 System Modelling

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7.3.A Converting a Conceptual Model to Building Elements
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7.3.B Wall Systems
• Selections:
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Interior Walls (Partition/Non-structural)
• Interior - 4 7/8" (1-hr)
• Structural Material = Metal Stud Layer
• Heat Transfer Coefficient (U) = 0.0472 BTU/(h-ft2-F)
• Thermal Resistance = 21.1904 (h-ft2-F)/BTU
• Thermal Mass = 1.4406 BTU/F
• Absorptance = 0.70
• Roughness = 3
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Concrete Exterior Walls (Around Fire Exit Stairs and Others)
• Concrete, Cast-in-place
• Default Concrete f'c=3.5 ksi
• Thermal Expansion Coefficient = 0.00001 inv Â°F
• Density = 150.28 pound per cubic foot
• Thermal Conductivity = 0.6044 btu/(hrÂ·ftÂ·Â°F)
• Specific Heat = 0.1569 btu/(lbÂ·Â°F)
• Emissivity = 0.95
• Permeability = 3.1881 grain/(ftÂ²Â·hrÂ·inHg)
• Porosity = 0.01
• Reflectivity = 0.11
• Electrical Resistivity = 2,000,000.0000 Î©Â·m
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Glass Exterior Walls (For Main Office, Cafe Lobby, and Gift Shop)
• Glass Soda Lime
• Density = 151.08 pound per cubic foot
• Yield Strength = 4.79 ksi
• Thermal Expansion Coefficient = 0.00001 inv Â°F
• Thermal Conductivity = 0.6356 btu/(hrÂ·ftÂ·Â°F)
• Specific Heat = 0.2006 btu/(lbÂ·Â°F)
• Emissivity = 0.95
• Permeability = 0.0000 grain/(ftÂ²Â·hrÂ·inHg)
• Porosity = 0.01
• Reflectivity = 0.00
• Electrical Resistivity = 1.0000E+10 Î©Â·m
• Heat Transfer Coefficient (U) = 12.2029 BTU/(h-ft2-F)
• Thermal Resistance = 0.0819 (h-ft2-F)/BTU
• Thermal Mass = 1.6178 BTU/F
• Absorptance = 0.70
• Roughness = 3
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7.3.C Windows & Glazing Systems
• Curtain Wall - Storefront
• Rectangular Muillion = 2.5" by 5" rectangular
• System Panel = Glazed
• Double glazing - 1/4 in thick - low-E/clear (e = 0.05) glass
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7.3.D, E, F Floor Systems & Terraces, Roof Systems, Green Roofs

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7.3.G Detailed Thermal Properties, 7.3.H Shading Features, 7.3.I Visible Light Properties, 7.3.J Using Spaces vs. Roof

7.4 Simulation & Analysis

• 7.4.A Energy Use Analysis
1. Baseline (Current = \$1.88, Target = \$1.68)
2. Proposed for Next Iteration (Proposed = \$0.84)
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Action Items

• 7.4.B Solar Analysis
• 7.4.C Daylighting Analysis

Brief Update versus Previous Model

I modified my building shape to adopt the inverted configuration because placing and allocation of space (in Module 5 and 6) have been difficult because of the steep envelope. It's really a challenge for my schematic design because the fire exit stair requirements must have their own space and the smoke should not enter it for evacuation. I also realized that having a green landscape would only be a good asset for my building if I am looking from the top. So, I changed it to become inverted so that visitors would just need to look up to appreciate the beauty of the green landscape around the perimeter. See pictures below for updates!!! ðŸ™‚ðŸ˜‰

#I will still need to update my space budget spreadsheet and bubble diagram for the final deliverable.

• Floor Level 1

• Floor Level 2
• Floor Level 3
• 3D
• Elevation View