Design optimization of a district heating and cooling system with a borehole seasonal thermal energy storage

Fiorentini, Massimo; Heer, Philipp; Baldini, Luca

doi:10.1016/j.energy.2022.125464

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-25704

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Design optimization of a district heating and cooling system with a borehole seasonal thermal energy storage
Authors:	Fiorentini, Massimo Heer, Philipp Baldini, Luca
et. al:	No
DOI:	10.1016/j.energy.2022.125464 10.21256/zhaw-25704
Published in:	Energy
Volume(Issue):	262, Part B
Issue:	125464
Issue Date:	2022
Publisher / Ed. Institution:	Elsevier
ISSN:	0360-5442
Language:	English
Subjects:	Seasonal thermal energy storage; Energy optimization; Multi-energy system; Renewable energy; CO2 emissions reduction
Subject (DDC):	620: Engineering
Abstract:	The optimal design of borehole thermal energy storage systems can ensure their techno-economical goals are met. Current design optimization methods either employ detailed modelling unsuitable for numerical optimization or use simplified models that do not consider operational conditions. This paper proposes an optimization-oriented model and a non-convex optimization formulation that, differently from other studies in the literature, can consider the influence of the seasonal storage size and temperature on its capacity, losses, heat transfer rate, and efficiency of connected heat pumps or chillers. This methodology was applied to a case study, considering two scenarios: storing only the rejected heat from cooling and integrating solar thermal generation. Results show that, with varying boundary conditions such as the electricity intensity profile, cooling demand, and price of carbon emissions, not only the optimal seasonal storage size changes but also its optimal operating conditions. The potential reduction of emissions was found, under standard boundary conditions, to be limited (up to 6.7%), but an increase in cooling demand and an enhancement of the intensity seasonal variation led to a reduction of 27.1%. Integration of solar generation further improved it to 43.7%, with a comparably small increase in annual cost, up to 6.1%.
URI:	https://digitalcollection.zhaw.ch/handle/11475/25704
Fulltext version:	Published version
License (according to publishing contract):	CC BY 4.0: Attribution 4.0 International
Departement:	Architecture, Design and Civil Engineering
Organisational Unit:	Institute for Building Technologies and Processes (IBP)
Appears in collections:	Publikationen Architektur, Gestaltung und Bauingenieurwesen

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Fiorentini, M., Heer, P., & Baldini, L. (2022). Design optimization of a district heating and cooling system with a borehole seasonal thermal energy storage. Energy, 262, Part B(125464). https://doi.org/10.1016/j.energy.2022.125464

Fiorentini, M., Heer, P. and Baldini, L. (2022) ‘Design optimization of a district heating and cooling system with a borehole seasonal thermal energy storage’, Energy, 262, Part B(125464). Available at: https://doi.org/10.1016/j.energy.2022.125464.

M. Fiorentini, P. Heer, and L. Baldini, “Design optimization of a district heating and cooling system with a borehole seasonal thermal energy storage,” Energy, vol. 262, Part B, no. 125464, 2022, doi: 10.1016/j.energy.2022.125464.

FIORENTINI, Massimo, Philipp HEER und Luca BALDINI, 2022. Design optimization of a district heating and cooling system with a borehole seasonal thermal energy storage. Energy. 2022. Bd. 262, Part B, Nr. 125464. DOI 10.1016/j.energy.2022.125464

Fiorentini, Massimo, Philipp Heer, and Luca Baldini. 2022. “Design Optimization of a District Heating and Cooling System with a Borehole Seasonal Thermal Energy Storage.” Energy 262, Part B (125464). https://doi.org/10.1016/j.energy.2022.125464.

Fiorentini, Massimo, et al. “Design Optimization of a District Heating and Cooling System with a Borehole Seasonal Thermal Energy Storage.” Energy, vol. 262, Part B, no. 125464, 2022, https://doi.org/10.1016/j.energy.2022.125464.