What is the impact of shading on sensible cooling loads?

Project Location: Zone 0A Extremely Hot Humid

Simulation Scale: Shoebox Model

Application: Conceptual

Audience: Architect/Designer

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1. Primary inputs of the analysis: Parameters for building model data: dimensions, material specifications (e.g., U Value for Wall, Roof, Glazing), SRI Value for Roof, SHGC Specification for Glazing, Window-to-Wall Ratio (WWR), and Overhanging Configuration. 2. Primary outputs of the analysis: Sensible Cooling Load breakdown for each zone (east, south, west, north) on the first floor in the primary analysis. Total cooling loads for the entire building in the secondary analysis. 3. Outcomes of the investigation: a. The investigation revealed the importance of determining the optimal overhang depth for each direction by comparing cooling requirements at varying depths. b. After analyzing the data, it was found that the south and north zones did not show a significant decrease when the depth was increased from 0.6m to 0.9m. c. c. c. Therefore, 0.6m was chosen as the optimal depth for these zones. However, the east and west zones require a higher vertical shading angle (VSA), and the maximum depth in the analysis is 0.9m. Therefore, 0.9m is the optimal choice for east and west. d. Once the optimal depth is identified, it is compared with two other scenarios: one without any overhangs and another with a standard (usually followed in practice) overhang depth of 0.6m on all sides. e. The investigation highlighted variations in solar incidence across different directions, suggesting the need to tailor treatments for specific facades based on their unique requirements. f. According to the investigation, it is not necessary to have the same overhang depth across the building facade. Case 3 can be a considerable option for varying depths.

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Design Variables

Is this part of the ASHRAE-209 cycle?

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The animated graphic (gif) facilitates easy comparison of different scenarios by overlaying the data, simplifying the focus on individual aspects at a time.

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