Energy and exergy analysis of prosumers in hybrid energy grids

Benjamin Manrique Delgado (Corresponding Author), Sunliang Cao, Ala Hasan, Kai Sirén

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Surplus energy can be a recurrent phenomenon in zero-energy buildings (ZEBs) with onsite generation systems, usually resulting in the export of excess electricity. Yet, converting electricity into heat and exporting it could improve the overall energy balance. This study analyses the energy and exergy performance of a Finnish nearly zero-energy building (nZEB) as a heat and electricity prosumer, and proposes alternative energy topologies to improve energy and exergy levels, primary energy demand and CO2 emissions. The results show that increasing the installed capacity of the photovoltaic systems would lead to zero energy, exergy, emissions and a balance of primary energy. However, by instead using the surplus electricity to drive a heat pump and export heat, the currently installed capacity would lead to a net energy export of over 4000 kWh/a. Thus, energy conversion could significantly enhance the contribution from heat and electricity prosumers to smart energy grids, though not without affecting other criteria. Two management strategies arise: favouring heat export improves the net energy and CO2 emissions reduction but lessens the net exergy, while favouring electricity export improves the net exergy and primary energy reduction. The findings highlight that energy conversion can enhance nZEB performance and its exchange with hybrid grids.
    Original languageEnglish
    Pages (from-to)668-685
    Number of pages18
    JournalBuilding Research and Information
    Volume46
    Issue number6
    Early online date23 May 2017
    DOIs
    Publication statusPublished - 2018
    MoE publication typeA1 Journal article-refereed

    Keywords

    • CO2 emissions
    • exergy
    • nearly zero-energy buildings (nZEBs)
    • net zero
    • renewable energy
    • sustainable buildings

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