Opt-shading

Brief

This project explores how geometry can influence the environmental performance of the building facade. A new prototype of facade component was proposed to optimize the indoor natural light environment for office buildings with large open plans.

 

Several major problems of conventional double glazing facade in terms of natural daylight were diagnosed during the evaluation process. By introducing a pair of shading and reflection board, the indoor light environment can be controlled to solved those problems. Using Grasshopper script combined with environmental simulation tools: Ladybug Tools, a series of multi-purpose, multi-parameter study were conducted to evaluate all possible conditions. As a result, top 10% of total geometries were selected as high-performance facade catalogue. This optimized facade was compared with conventional double-facade on their environmental performance as verification of the original design idea. 

 

A performance oriented design work flow was explored during the process, which is: 

CLIMATIC ANALYSIS -- DESIGN INTENTIONS -- GEOMETRIC PARAMETERS ASSOCIATION -- SIMULATION -- EVALUATION AND SELECTION -- VERIFICATION.  

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Parameters: 

Length of Reflection Board: L1

Angle of Reflection Board: A1

Length of Shade: L2

Angle of Shade: A2

Geometric Iterations

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Accumulative Solar Radiation 

Annual sDA + Over-lit Area Ratio

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Simulation Results

PV Potential 

Design Intentions

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Renewable Energy

Maximize PV Supplement

Health & Well-being

Climate Analysis

Minimize Solar Gain in Summer

Maximize Annual Daylight Accessibility

Minimize Over-lit Area

Maximize Solar Gain in Winter

weight

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Rating

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Comparison with Conventional Double Glazing

After finding the possible best geometries, a random selection from the best pool was tested against conventional double facade. The two cases have the same glazing ratio and plan. To have a relatively clear standard for comparison, daylight factor was adopted here as the metric for indoor illuminance level. 

As a conclusion, the plan with new facade components has less darker area(dark blue) in the middle and less over-lit area along the perimeter(dark yellow). Also, the new facade can create some diversity in the area that has more uniformly distributed DF level in the conventional plan, and this diversity can be dynamically controlled via changing the parameters of the shading and reflection boards.

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Work Flow

The core of this study is bridging geometric parameters with energy simulation engines and setting up automatic iteration process, which can be realized using Grasshopper+Ladybug Tools and Diva.

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Geometry Setup and Control Module

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Material Properties Module

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Diva Daylight Factor & Radiation Simulation Module

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PV Potential Module

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Data Record and Export Module

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Application Scenario

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