Trend AnalysisEngineering

Net-Zero Energy Buildings: Passive Design Meets Smart Materials

Buildings consume ~40% of global energy and produce ~36% of COโ‚‚ emissions. Net-zero energy buildings (NZEBs) aim to produce as much energy as they consume annually through a combination of passive des...

By Sean K.S. Shin
This blog summarizes research trends based on published paper abstracts. Specific numbers or findings may contain inaccuracies. For scholarly rigor, always consult the original papers cited in each post.

The Question

Buildings consume ~40% of global energy and produce ~36% of COโ‚‚ emissions. Net-zero energy buildings (NZEBs) aim to produce as much energy as they consume annually through a combination of passive design strategies (insulation, orientation, natural ventilation, thermal mass) and renewable energy generation (rooftop solar, building-integrated PV). The EU mandates all new buildings be "nearly zero-energy" from 2021, and similar requirements are emerging globally. But achieving NZEB performance in diverse climates โ€” from hot-arid to cold-continental โ€” requires different strategies. What works in Stockholm fails in Dubai. Which passive design principles are universal, and which are climate-specific?

Landscape

Soliman et al. (2025) in Scientific Reports, demonstrated an innovative approach to improving building envelope thermal resistance: incorporating eggshell waste into fired clay bricks. The modified bricks achieved significantly higher thermal resistance than conventional bricks, reducing cooling energy demand. This approach addresses two problems simultaneously: construction material improvement and agricultural waste valorisation.

Resende & Corvacho (2024) optimised nZEB envelope design for passive thermal comfort in Southern European climates, where overheating is as problematic as heat loss. Their analysis found that excessive insulation โ€” effective in cold climates โ€” can trap heat in summer, requiring careful balancing of insulation thickness, solar gain control, and thermal mass.

Ibrahim et al. (2024) tackled the retrofit challenge: most buildings that will exist in 2050 are already built. They developed a machine learning model for optimising retrofit measures to achieve NZEB under climate change scenarios, showing that retrofit strategies designed for current climate conditions may underperform as temperatures rise over the building's remaining lifespan.

Abuimara et al. (2025) designed a net-zero energy housing archetype for UAE families, combining 3D concrete printing with passive strategies (cross-ventilation, improved envelope) and rooftop solar. Their work showed that NZEB is achievable even in extreme hot-arid climates if cooling loads are dramatically reduced through passive design before adding renewables.

Key Claims & Evidence

<
ClaimEvidenceVerdict
Waste-derived materials can improve building thermal performanceEggshell-modified bricks increase thermal resistance (Soliman et al. 2025)Demonstrated; scalability depends on local waste availability
Excessive insulation can cause overheating in warm climatesEnvelope optimisation for Southern Europe shows insulation-overheating trade-off (Resende & Corvacho 2024)Confirmed; climate-specific design is essential
Retrofit strategies must account for future climateML-optimised retrofits for climate change scenarios (Ibrahim et al. 2024)Important finding; most retrofits ignore climate projections
NZEB is achievable in extreme hot-arid climatesUAE housing archetype with passive + solar reaches net-zero (Abuimara et al. 2025)Demonstrated in design; operational verification needed

Open Questions

  • Embodied energy: NZEB focuses on operational energy. When embodied energy (manufacturing insulation, solar panels, concrete) is included, does NZEB achieve true net-zero lifecycle energy?
  • Occupant behaviour: Building performance models assume standard occupancy patterns. How much does actual occupant behaviour (thermostat settings, window opening, plug loads) deviate from design assumptions?
  • Grid interaction: NZEBs may produce excess energy during sunny midday and consume during evening peaks. How should building-grid interaction be managed for system benefit?
  • Affordability: NZEB construction costs 5โ€“15% more than conventional. Can this premium be justified by lifecycle energy savings, especially in markets with low energy prices?
  • Referenced Papers

    • [1] Soliman, W. et al. (2025). Green building development with modified clay bricks and eggshell waste. Scientific Reports. DOI: 10.1038/s41598-025-87435-4
    • [2] Resende, J. & Corvacho, H. (2024). Optimisation of nZEB Envelope for Passive Thermal Comfort in Southern Europe. Buildings, 14(9), 2757. DOI: 10.3390/buildings14092757
    • [3] Ibrahim, M. et al. (2024). Building retrofitting towards net zero energy under climate change. J. Physics: Conference Series. DOI: 10.1088/1742-6596/2857/1/012026
    • [4] Abuimara, T. et al. (2025). Designing a Net-Zero Energy Housing Archetype for UAE. Environmental Science and Sustainable Development. DOI: 10.21625/essd.v10i3.1224
    • [5] Wang, J. et al. (2024). Net-Zero Building Technology in Hot Summer and Cold Winter Regions. J. Building Technology and Practice. DOI: 10.22158/jbtp.v12n3p48

    References (5)

    Soliman, W., Ahmed, Y. M. Z., Ghitas, A., Elโ€‘Shater, A., & Shahat, M. A. (2025). Green building development utilising modified fired clay bricks and eggshell waste. Scientific Reports, 15(1).
    Resende, J., & Corvacho, H. (2024). Optimisation of Nearly Zero Energy Building Envelope for Passive Thermal Comfort in Southern Europe. Buildings, 14(9), 2757.
    Ibrahim, M., Harkouss, F., Biwole, P., Fardoun, F., & Oultboukhtine, S. (2024). Building retrofitting towards net zero energy under climate change. Journal of Physics: Conference Series, 2857(1), 012026.
    Abuimara, T., Haddad, M., Aldhaheri, A., Alzubaidi, M., Alyafei, M., & Alderei, R. (2025). House of the Future: Designing a Net-Zero Energy Housing Archetype for Emirati Families. Environmental Science & Sustainable Development, 67-80.
    Jing, W., Lijuan, C., Huili, C., Miaomiao, L., Qianqian, C., Chuanli, Y., et al. (2024). Practical Exploration of Net-Zero Building Technology in Hot Summer and Cold Winter Regionsโ€”Qingdao Sino-German Eco-Park Longfor Guangnian Project as an Example. Journal of Business Theory and Practice, 12(3), p48.

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