TS RERA No.P02400003403.

Building Envelope Performance - Part 1

June 5, 2024

Insights from Organo Naandi Rurban Home (West Facing)

Author : Prajwala Gaddalay, Assistant Manager (Sustainability)

Co-Author : Author: Meena Murugappan, Director (Product Strategy & Innovation)

Understanding the Long-Term Impact of Our Designs

As architects and developers, our responsibility extends beyond project completion. While we focus on balancing customer success, aesthetic appeal, sustainability, and functionality, we must also consider the long-term performance of our buildings. Understanding how buildings perform over time is crucial for their impact on the environment and climate change.

Re-evaluating Earth Air Tunnel Systems

At Organo, we are keen to explore this aspect further. Rakesh Koti, Head of Sustainability, and I revisited the Earth Air Tunnel at Organo Naandi, constructed in 2019. Five years post-completion, with the landscape now mature, we measured the temperature drop during peak summer in Hyderabad. You can read more about our Earth Air Tunnel Systems [here](https://organorurban.wordpress.com/2015/04/02/tunnel-draft-a-cooling-system/). We found a significant temperature drop of 6 degrees from an ambient temperature of 39 degrees, which delighted the residents.

Previous studies showed similar results, with temperature drops ranging from 6 to 8 degrees (and sometimes 10-12 degrees in north-facing homes). A detailed cost-benefit analysis, however, suggested that there might be more economical and effective alternatives to the Earth Air Tunnel system. More details on this can be found [here](https://www.organo.co.in/blog/lesson-from-sapthapatha-part-1-air).

Measuring Thermal Performance

During our temperature and comfort analysis, we used Infrared (IR) systems to measure the thermal performance of the building envelope, which includes the walls, windows, roof, and floor.

Infrared Analysis

Our evaluation, conducted on May 17, 2024, at 3:30 PM, recorded the highest temperature at 39 degrees Celsius. The house has a west-facing entrance, with windows on the east and west sides and bedrooms on the south side. Initially, we thought the southern wall would receive the most sunlight. However, the IR camera readings showed that the west window on the first floor had higher temperatures than the east window. Additionally, the west window displayed temperature variations within its frame, indicating shaded areas. Surprisingly, the southern wall was not significantly affected by the high heat.

Image 1: Photo of the West Window on the first floor with the Mature Trees and Shrubs
Image 2: Infra Red Image of the West Window with the Mature Trees and Shrubs. Notice the temperature drop in the interior, even without the AC turned on. 

Image 3: Photo of the West Window on the ground floor
Image 4: Infra Red Image of the West Window on the ground floor. This window is directly below the window in Image1 but there is a significant drop in the temperature due to the slab projections over the window.

Insights from Radiation Mapping

To further investigate, we conducted a study using FormIt software to map radiation on a block model. The results revealed that the southern wall receives maximum radiation from July to December, a period with relatively lower daily temperatures compared to summer months. This means the south wall is more affected during the cooler part of the year. During summer, the west wall and roof experienced the highest impact from increased sunlight. These insights highlight the importance of strategically designing different building surfaces to enhance thermal comfort and energy efficiency throughout the year.

Image 5: Direct radiation from months Jan-Mar.

Here the southern Wall and western wall have higher temperatures. 

Here the southern wall is relatively low compared to the western wall. The roof takes the maximum impact during the peak summer months as the sun is at its highest angle. 

Image 7: Direct radiation from months Jul-Sep.The southern wall radiation keeps getting higher by the month.
Image 8: Direct radiation from months Oct-Dec.


The southern wall radiation keeps getting higher by the month.

The roof gets lower radiation during these months as the sun is at a lower angle. 

Future Design Strategies

These observations are helping us refine design strategies for upcoming projects in Organo Ibrahimpalle, Organo Aloor, and Organo Depalli. By integrating real-time and computational studies, we can select climate-appropriate materials, determine where insulation is needed, and make thoughtful use of vegetation around buildings. Combining these approaches allows us to create more sustainable and energy-efficient designs tailored to each location's unique environmental conditions.

Understanding the long-term performance of our designs is essential for creating sustainable and energy-efficient buildings. At Organo, we are committed to continually improving our strategies to meet these goals.

About Studio Organo

We are a cross-functional and research-focused team of architects, engineers, and technical experts, who ideate, refine and detail eco habitat products, components, and solutions. Our core intent is to co-create and manifest apt rurban lifestyles across all eco-habitat components to celebrate the living for respective user groups. From earth-friendly neighborhoods to home interiors, we’ve got it all covered.

Instagram: https://www.instagram.com/studioorgano/
Website :https://www.organo.co.in/studio-organo

If you’d like to know about our design explorations, please email us at studio@organo.co.in