Your Name
Brianny Martinez
Linked Student
Journal Entry For
Module 7 - Building Envelope Systems
Scored
Created
Feb 11, 2022 10:05 PM
Last Edited
Feb 13, 2022 5:25 AM
/w=3840,quality=80,fit=scale-down)
- Features of the Building Envelope and Wall System
- Green Roof
- Green roofs provide additional insulation to the building, reduces the urban heat island effect, and provides a high thermal mass value.
- Thermal mass: 20 Btu/ft*F
- R-value: 2
- 12” Concrete Ext. Walls with 4” of Rigid Insulation
- Although concrete is not considered a good insulator (low R-value), it has a very high thermal mass which means that it can store heat and release it at night when it’s needed; moreover, the typical Portland cement mix can be replaced with a more sustainable alternative such as LC3 or other cementious composites (i.e. ECC). The light color of some ECC mixes helps keep the building cool through a high solar reflectance.
- In order to address concrete’s low thermal resistance, I added 4” of insulation to its interior.
- Overall Performance:
- R-value: 18
- Thermal mass: 22 Btu/ft*F
- Insulated Roof
- R value: 113
- Trombe Wall
- The first-floor building is facing south so it is receiving an abundance of daylighting; I added two concrete trombe walls at the ends of the curtain wall to capture the excess heat.
- Windows, Glazing, and Skylights
- Skylights
- I placed the skylights over areas where daylighting was not sufficient based on my lighting analysis.
- Curtain Walls
- The location of the curtain walls encourage access to the outdoors and limits excess solar radiation.
- Glazing
- The glazing is double glass, 1/4 in thick, low e (0.05). Initially, I designed for 42 VLT but my lighting analysis showed that not enough daylighting was entering the buildings. I removed this from the glazing in order to increase daylighting.
- Shading Features
- 3’ Overhang on roofs
- Shades on windows and curtain walls: 2.5’
- the overhangs decreased my overall insight performance
Future considerations:
With my current modeling, the insight prediction is 29.7. Once efficient HVAC and lighting is considered, the model is well below 0.
Baseline Insight Results:
/w=3840,quality=80,fit=scale-down)
Insight Result with Shading, WWR, and PV surface coverage:
Insight Result including Lighting Efficiency and Daylighting Controls:
Solar Analysis:
Lighting Analysis:
