By Eamonn Ryan
Data centres, affordability and the imperative of theory.
The most dramatic shift is the surge in cooling requirements. Freepik.com
As global building demands evolve, HVAC systems are confronting a new set of pressures – from explosive growth in
data-centre cooling loads to the need for affordable climate-control solutions across developing regions. Reflecting on these challenges, experienced engineer Alec Johannsen shared his perspective on where the industry is heading and what the next generation of engineers must prioritise.
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Data centres are reshaping global cooling demand
The most dramatic shift is the surge in cooling requirements driven by data centres, in turn fuelled by AI expansion, cloud computing and the digital backbone of modern economies. “These are enormous cooling loads. The scale places demands on countries in a way traditional HVAC systems never needed to accommodate,” Johannsen notes.
Unlike conventional buildings, data centres require highly specialised, continuous cooling solutions with:
- Extreme reliability
- Low tolerance for temperature deviations
- Massive, concentrated heat loads
“This represents a distinct engineering category – and one that is expanding at unprecedented speed.”
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Making HVAC systems affordable at global scale
At the other end of the spectrum lies a humanitarian and climate- related challenge: affordable, efficient cooling and heating for large populations, especially in developing countries. Johannsen emphasises that equitable access to safe indoor conditions is more than a comfort issue – it affects:
- Health
- Productivity
- Energy consumption
- National climate commitments
Innovations in small-scale, low-cost technologies, efficient refrigerants and solar-integrated solutions will play an increasingly important role in closing this global gap.
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Keeping pace with rapid equipment innovation
Between high-end data centre technology and mass-market residential systems lies a rapidly evolving middle ground. Manufacturers are constantly releasing new equipment categories, performance enhancements and control strategies. Engineers must stay informed to integrate these effectively and to avoid outdated assumptions that undermine system performance. Continuous learning – through research, standards updates and technology reviews – remains a core professional responsibility.
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Research as the foundation of progress
For Johannsen, research is not a theoretical luxury; it is the foundation of all long-term development. “One must research something well before applying it,” he says. Rigorous research underpins reliability, safety and innovation, particularly as energy efficiency and climate targets demand deeper technical accuracy.
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Advice to young engineers: combine theory and experience
One of Johannsen’s most consistent themes is the need to bridge theoretical understanding with practical experience. He rejects the false dichotomy between ‘book knowledge’ and hands-on skill. The best engineers, he argues, are defined by their ability to:
- Ground observations in sound scientific principles
- Test practical problems against theoretical frameworks
- Retain curiosity about how systems behave and why
Those who draw from both streams produce the industry’s most robust and innovative solutions.
The HVAC and energy-efficiency sector stands at a defining moment. Rising digital infrastructure, global development needs and accelerating climate expectations are reshaping demand patterns. At the same time, engineering fundamentals – rigorous theory, continuous learning and thoughtful application – remain more important than ever.
Johannsen’s reflections offer a grounded, long-term view: progress will come to those who embrace both innovation and foundational engineering principles.
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