By Eamonn Ryan
The following article is derived from an ASHRAE UK presentation on ASHRAE UK chapter’s upcoming Hot Climate Design Guide, by Frank Mills, FASHRAE and professional consulting engineer. This is Part 8 of an eight-part series.

Systems that combine cooling, heating and power generation can be more sustainable and energy-efficient if designed to work together. Freepik.com
Another important strategy that the guide explores is the use of natural shading and solar control. As demonstrated by the photo of Granada’s traditional streets, the close spacing of buildings creates natural shading, preventing direct sunlight from overheating interior spaces. In such environments, natural shading—such as overhanging balconies, pergolas and tree canopies—can help reduce the amount of solar radiation entering buildings, thereby lowering cooling loads.
Additionally, buildings may incorporate adjustable shading devices that track the movement of the sun. While these devices require more attention and maintenance, they can significantly enhance comfort by offering flexibility in response to the changing position of the sun throughout the day.
Exploring solutions for hot and dry climates
Further discussion touched on the innovative concept of waste heat recovery from data centres, a growing trend in places like Scandinavia and Toronto. Data centres, which generate substantial heat through their cooling processes, could potentially use that heat to provide heating or hot water for nearby buildings, including hospitals, schools and offices. This type of shared system represents a sustainable approach to energy use, reducing waste while also benefiting the broader community.
The conversation also touched upon the need for more collaborative efforts between architects, engineers and urban planners to achieve these goals. For example, systems that combine cooling, heating and power generation can be more sustainable and energy-efficient if designed to work together.
One interesting aspect of the workshop was the insight shared by participants from various regions. The challenges faced in Mumbai, where the heat can feel unbearable due to the urban heat island effect, highlight the complexity of urban heat management. As buildings originally designed for cooler climates become increasingly uncomfortable in warmer temperatures, addressing the heat island effect through better urban planning and design becomes imperative. By harnessing both passive and active solutions, and learning from successful projects in other regions, cities can move toward energy-efficient, sustainable designs that better adapt to climate extremes.
This workshop was an important step toward advancing knowledge on designing for extreme climates and fostering greater international collaboration. The eventual publication of the Hot Climate Design Guide promises to be an essential tool for tackling these pressing challenges.