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Net-zero buildings, what are they and what they should be?

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  • Kilkis, Birol

Abstract

This paper quantifies that current net-zero building definitions will remain as necessary but not sufficient conditions in sustainable decarbonization efforts until they recognize exergy destructions as one of the root causes of emission responsibilities. A direct relationship between exergy destructions and nearly-avoidable carbon dioxide emissions has been set as a sufficient condition to upgrade the decarbonization mindset. This relationship is demonstrated in a case study where a solar prosumer building with photovoltaic panels and a ground-source heat pump, known as a net-zero energy building, is responsible for emissions. Based on the second law, emission responsibilities, primarily at the PV panels and the heat pump, were identified. By replacing them with advanced photo-voltaic-heat panels with temperature peaking and heat pump with adsorption cooling machines, carbon dioxide emission responsibility due to avoidable exergy destructions was reduced by 96%. The main attribute is using solar power only for electric power instead of downgrading it downstream to heat or cold by the heat pump, minimizing exergy mismatches between electrical and thermal power. The paper also shows that a net-zero energy building may neither be a net-zero exergy building nor a zero-carbon building due to these exergy destructions.

Suggested Citation

  • Kilkis, Birol, 2022. "Net-zero buildings, what are they and what they should be?," Energy, Elsevier, vol. 256(C).
    • Handle: RePEc:eee:energy:v:256:y:2022:i:c:s0360544222013457
    DOI: 10.1016/j.energy.2022.124442
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    References listed on IDEAS

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    3. Yang, Weijia & Huang, Yuping & Zhang, Tianren & Zhao, Daiqing, 2023. "Mechanism and analytical methods for carbon emission-exergy flow distribution in heat-electricity integrated energy system," Applied Energy, Elsevier, vol. 352(C).

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