Building for a Hotter Future: Smart Design Solutions to Cut Building Energy Use, Particularly in the Global South

Buildings in hot climate zones face unique challenges in reducing energy use and CO₂ emissions, especially as urbanization and population growth drive new construction. This study examines how different design choices and technologies can help make buildings more energy-efficient while keeping them comfortable in high temperatures. Using computer simulations, the researchers tested five building types—ranging from homes to offices—across five hot climate regions. They explored a mix of passive design strategies (like better windows, reflective roofs, and solar shading), active cooling systems, and renewable energy options to see which solutions had the greatest impact.

The results show that simple changes, such as improving windows and adding shading, can significantly reduce cooling needs. More advanced systems, like hybrid ventilation and decentralized cooling units, further improve efficiency, while solar energy solutions help offset electricity use. The study also found that climate change will increase cooling demand in the future, making energy-efficient design even more critical. Notably, residential buildings had the greatest potential for achieving low-carbon or even zero-carbon status, while offices and hotels posed greater challenges due to their higher energy use.

To turn these insights into action, the study highlights the need for stronger policies and building codes, particularly in the Global South, where energy-efficient design is less widely implemented. The findings provide a roadmap for decision-makers to develop strategies that balance affordability with sustainability. By combining modern technology with lessons from traditional architecture, buildings in hot climates can become more efficient, reducing emissions while improving comfort and resilience in a warming world.

Overview of building types showing floorplans and basic renderings.

Citation

Österreicher, D., & Seerig, A. (2024). Buildings in hot climate zones—Quantification of energy and CO₂ reduction potential for different architecture and building services measures. Sustainability, 16(22), 9812. https://doi.org/10.3390/su16229812

Can Every City Be a 15-Minute City?

The idea of a "15-minute city" has gained a lot of attention recently. This concept envisions cities where you can reach essential services, like schools, stores, and parks, within a 15-minute walk or bike ride. While this idea is exciting and has started important conversations about how cities should be designed, it isn’t practical everywhere, and there are challenges with how it’s defined.

This research explores how close cities around the world are to meeting the 15-minute city ideal. By measuring how quickly you can access important services, it becomes clear that access varies widely both within and between cities. A big factor is how densely populated areas are.

An online tool (https://whatif.sonycsl.it/15mincity/) allows you to explore access scores for almost any city in the world. The research also examines how better planning and resource distribution could reduce inequalities in access. The results show significant differences in the number of extra services cities would need to meet the 15-minute city standard.

To make this concept work for more cities, it should be adapted to fit local conditions, including population density and cultural needs. Instead of focusing only on time, cities should also prioritize what you and others value most.

Bruno, M., Monteiro Melo, H.P., Campanelli, B. et al. A universal framework for inclusive 15-minute cities. Nat Cities 1, 633–641 (2024). https://doi.org/10.1038/s44284-024-00119-4

Cities and DEI - Quotes of the Day

 Quotes of the day! Cities and DEIA

Photo by SiravitPlug on Unsplash

Cities as hubs of innovation 

"In cities, we’re constantly interacting with people from diverse backgrounds, creating a web of social connections. These interactions drive us to adapt, learn, and grow."
–adigaskell.org, Urban Design Affects the Racial Biases We Develop

This quote resonates with my belief that cities are hubs of innovation and transformation. Their cosmopolitan nature—bringing together people from various cultures, mindsets, and experiences—creates fertile ground for new ideas and ways of thinking. For example, in history, Yokohama, Japan, was the only place where foreigners were allowed to reside. To this day, it remains a hub of innovation in Japan. Similarly, cities like New York, London, and Shanghai have emerged as centers of creativity and progress due to their cultural diversity.

DEI as means for improved organizational governance

"In the fourth week, the most junior, female member of the staff team said in a plenary session that she was aware of a conflict occurring in the group. The person chairing the session, the most senior, male government official on the lab team, declared, 'There is no conflict here!' The staff member was silenced, and over the remaining four weeks, she never, ever spoke in plenary again."
–Adam Kahane, Power and Love

This is an example of silencing, which highlights an important issue in diversity, equity, and inclusion (DEI) initiatives. The senior staff member, likely without realizing it, dismissed the concern with an offhand remark. This small moment caused a breakdown in communication and discouraged further contributions from the staff member. Addressing such situations isn’t about giving special treatment or prioritizing one group over another. It’s about fostering better communication and improving organizational dynamics, ensuring everyone feels heard and valued.

Building the Stayable City - Urban Design for Social Cohesion

Gao, T., Lim, S., Wong, D. K. H., & Schroepfer, T. (2024). From walking to staying: The impact of spatial qualities on socio-spatial segregation in innovation districts. Sustainable Cities and Society, 113, 105688. https://doi.org/10.1016/j.scs.2024.105688

From walking to staying: The impact of spatial qualities on socio-spatial segregation in innovation districts

This study explores how innovation districts, like One-north in Singapore, can drive urban economic growth while addressing socio-spatial segregation. It emphasizes designing public spaces to encourage "staying activities" (e.g., sitting, playing, relaxing) over transient activities like walking or cycling, to foster social interaction among diverse socioeconomic groups.

Using a GeoAI workflow that combines data analysis, machine learning, and AI, the researchers evaluate 13 spatial quality indicators and their impact on staying activities. A deep neural network (DNN) model with an 83.74% accuracy rate shows that these indicators can predict where people from different income groups engage in staying activities.

Interestingly, features like visual diversity and greenery—typically associated with good public spaces—do not always increase staying activities. Their effectiveness depends on the specific functional context and land-use type within different parts of the district.

This research highlights the importance of tailoring public space designs to local contexts to encourage meaningful interactions and reduce segregation. The proposed GeoAI workflow offers a proactive tool to evaluate design strategies before construction, helping policymakers create more inclusive urban environments.

Open Source Article