Thermo-Electric Energy Storage with Solar Heat Integration: Exergy and Exergo-Economic Analysis

Daniele Fiaschi, Giampaolo Manfrida, Karolina Petela and Lorenzo Talluri
Additional contact information
Daniele Fiaschi: Department of Industrial Engineering, Università degli Studi di Firenze, Florence, Italy
Giampaolo Manfrida: Department of Industrial Engineering, Università degli Studi di Firenze, Florence, Italy
Karolina Petela: Institute of Thermal Technology, Silesian University of Technology, Gliwice, Poland
Lorenzo Talluri: Department of Industrial Engineering, Università degli Studi di Firenze, Florence, Italy

Energies, 2019, vol. 12, issue 4, 1-21

Abstract: A Thermo-Electric Energy Storage (TEES) system is proposed to provide peak-load support (1–2 daily hours of operation) for distributed users using small/medium-size photovoltaic systems (4 to 50 kWe). The purpose is to complement the PV with a reliable storage system that cancompensate the produc tivity/load mismatch, aiming at off-grid operation. The proposed TEES applies sensible heat storage, using insulated warm-water reservoirs at 120/160 °C, and cold storage at −10/−20 °C (water and ethylene glycol). The power cycle is a trans-critical CO 2 unit including recuperation; in the storage mode, a supercritical heat pump restores heat to the hot reservoir, while a cooling cycle cools the cold reservoir; both the heat pump and cooling cycle operate on photovoltaic (PV) energy, and benefit from solar heat integration at low–medium temperatures (80–120 °C). This allows the achievement of a marginal round-trip efficiency (electric-to-electric) in the range of 50% (not considering solar heat integration).The TEES system is analysed with different resource conditions and parameters settings (hot storage temperature, pressure levels for all cycles, ambient temperature, etc.), making reference to standard days of each month of the year; exergy and exergo-economic analyses are performed to identify the critical items in the complete system and the cost of stored electricity.

Keywords: energy storage; thermo-electric; supercritical CO 2; solar energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/4/648/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/4/648/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:4:p:648-:d:206720

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().