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

Fingerprint

Exergy
Electricity
Energy conversion
Energy balance
Hot Temperature
Topology
Pumps

Keywords

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

Cite this

Manrique Delgado, Benjamin ; Cao, Sunliang ; Hasan, Ala ; Sirén, Kai. / Energy and exergy analysis of prosumers in hybrid energy grids. In: Building Research and Information. 2018 ; Vol. 46, No. 6. pp. 668-685.
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Energy and exergy analysis of prosumers in hybrid energy grids. / Manrique Delgado, Benjamin (Corresponding Author); Cao, Sunliang; Hasan, Ala; Sirén, Kai.

In: Building Research and Information, Vol. 46, No. 6, 2018, p. 668-685.

Research output: Contribution to journalArticleScientificpeer-review

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