This paper is proposing and analyzing an electric energy storage system fully integrated with a photovoltaic PV module, composed by a set of lithium-iron-phosphate (LiFePO4) flat batteries, which constitutes a generation-storage PV unit. The batteries were surface-mounted on the back side of the PV module, distant from the PV backsheet, without exceeding the PV frame size. An additional low-emissivity sheet was introduced to shield the batteries from the backsheet thermal irradiance. The challenge addressed in this paper is to evaluate the PV cell temperature increase, due to the reduced thermal exchanges on the back of the module, and to estimate the temperature of the batteries, verifying their thermal constraints. Two one-dimensional (1D) thermal models, numerically implemented by using the thermal library of Simulink-Matlab accounting for all the heat exchanges, are here proposed: one related to the original PV module, the other related to the portion of the area of the PV module in correspondence of the proposed energy-storage system. Convective and radiative coefficients were then calculated in relation to different configurations and ambient conditions. The model validation has been carried out considering the PV module to be at the nominal operating cell temperature (NOCT), and by specific experimental measurements with a thermographic camera. Finally, appropriate models were used to evaluate the increasing cell batteries temperature in different environmental conditions.

Thermal and performance analysis of a photovoltaic module with an integrated energy storage system / Hammami, Manel; Torretti, Simone; Grimaccia, Francesco; Grandi, Gabriele. - In: APPLIED SCIENCES. - ISSN 2076-3417. - ELETTRONICO. - 7:11(2017), pp. 1107.1-1107.15. [10.3390/app7111107]

Thermal and performance analysis of a photovoltaic module with an integrated energy storage system

Hammami, Manel
;
Grandi, Gabriele
2017

Abstract

This paper is proposing and analyzing an electric energy storage system fully integrated with a photovoltaic PV module, composed by a set of lithium-iron-phosphate (LiFePO4) flat batteries, which constitutes a generation-storage PV unit. The batteries were surface-mounted on the back side of the PV module, distant from the PV backsheet, without exceeding the PV frame size. An additional low-emissivity sheet was introduced to shield the batteries from the backsheet thermal irradiance. The challenge addressed in this paper is to evaluate the PV cell temperature increase, due to the reduced thermal exchanges on the back of the module, and to estimate the temperature of the batteries, verifying their thermal constraints. Two one-dimensional (1D) thermal models, numerically implemented by using the thermal library of Simulink-Matlab accounting for all the heat exchanges, are here proposed: one related to the original PV module, the other related to the portion of the area of the PV module in correspondence of the proposed energy-storage system. Convective and radiative coefficients were then calculated in relation to different configurations and ambient conditions. The model validation has been carried out considering the PV module to be at the nominal operating cell temperature (NOCT), and by specific experimental measurements with a thermographic camera. Finally, appropriate models were used to evaluate the increasing cell batteries temperature in different environmental conditions.
2017
Thermal and performance analysis of a photovoltaic module with an integrated energy storage system / Hammami, Manel; Torretti, Simone; Grimaccia, Francesco; Grandi, Gabriele. - In: APPLIED SCIENCES. - ISSN 2076-3417. - ELETTRONICO. - 7:11(2017), pp. 1107.1-1107.15. [10.3390/app7111107]
Hammami, Manel; Torretti, Simone; Grimaccia, Francesco; Grandi, Gabriele
File in questo prodotto:
File Dimensione Formato  
applsci-07-01107.pdf

accesso aperto

Descrizione: APPSCI-2017-PV-thermal
Tipo: Versione (PDF) editoriale
Licenza: Creative commons
Dimensione 2.07 MB
Formato Adobe PDF
2.07 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/615254
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 83
  • ???jsp.display-item.citation.isi??? 68
social impact