Energy and exergy analysis of prosumers in hybrid energy grids
Description
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 CO<sub>2</sub> 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 CO<sub>2</sub> 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.
Show moreYear of publication
2017
Authors
Department of Energy and Mechanical Engineering
Ala Hasan - Contributor
Benjamin Manrique Delgado - Creator
Sunliang Cao - Creator
Hong Kong Polytechnic University - Contributor
VTT Technical Research Centre of Finland - Contributor
figshare - Publisher
Other information
Fields of science
Civil and construction engineering; Environmental engineering
Open access
Open
License
Creative Commons Attribution 4.0 International (CC BY 4.0)