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Research Papers

# Thermo-Economic Operation Analysis of SOFC–GT Combined Hybrid System for Application in Power Generation Systems

[+] Author and Article Information
Jamasb Pirkandi

Department of Aerospace Engineering,
Malek Ashtar University of Technology,
Tehran 15875-1774, Iran
e-mail: j_pirkandi@dena.kntu.ac.ir

Department of Aerospace Engineering,
Malek Ashtar University of Technology,
Tehran 15875-1774, Iran
e-mail: m.ommian@gmail.com

1Corresponding author.

Manuscript received December 4, 2016; final manuscript received April 17, 2018; published online May 9, 2018. Editor: Wilson K. S. Chiu.

J. Electrochem. En. Conv. Stor. 16(1), 011001 (May 09, 2018) (12 pages) Paper No: JEECS-16-1155; doi: 10.1115/1.4040056 History: Received December 04, 2016; Revised April 17, 2018

## Abstract

This study investigated the combination of the direct and indirect hybrid systems in order to develop a combined hybrid system. In the proposed system, a direct solid oxide fuel cell (SOFC) and gas turbine (GT) hybrid system and an indirect fuel cell cycle were combined and exchanged the heat through a heat exchanger. Several electrochemical, thermal, and thermodynamic calculations were performed in order to achieve more accurate results; then, beside the parametric investigation of the abovementioned hybrid system, the obtained results were compared to the results of direct and indirect hybrid systems and simple GT cycle. Results indicate that the efficiency of the combined hybrid system was between those of the direct and indirect hybrid systems. The electrical efficiency and the overall efficiency of the combined hybrid system were 43% and 59%, respectively. The generation power in the combined hybrid system was higher than that of both other systems, which was the only advantage of using the combined hybrid system. The generation power in the combined hybrid system was higher than that of the direct hybrid system by 16%; accordingly, it is recommended to be used by the systems that are supposed to have high generation power.

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## Figures

Fig. 1

Schematic of combined hybrid system

Fig. 2

Schematic of the proposed hybrid system

Fig. 3

Effect of compressor's pressure ratio of (a) fuel cell cycle and (b) gas turbine cycle on operating temperatures of the system

Fig. 4

Effect of compressor's pressure ratio of both cycles on electrical efficiency of the system

Fig. 5

Effect of compressor's pressure ratio of both cycles on generation power of the system

Fig. 6

Effect of compressor's pressure ratio of both cycles on exergy destruction rate in the system

Fig. 7

Effect of compressor's pressure ratio of both cycles on exergy loss rate in the system

Fig. 8

Effect of compressor's pressure ratio of both cycles on irreversibility rate in the system

Fig. 9

Effect of compressor's pressure ratio (a) of both cycles on generated electricity price, (b) of both cycles on purchase, installation, and implementation costs, and (c) on efficiency and generated electricity price in the system

Fig. 10

Effect of air–fuel ratio of (a) fuel cell cycle and (b) gas turbine cycle on operating temperatures of the system

Fig. 11

Effect of air–fuel ratio on efficiency of the system

Fig. 12

Effect of air–fuel ratio on generation power of the system

Fig. 13

Effect of air–fuel ratio on exergy destruction rate in the system

Fig. 14

Effect of air–fuel ratio on irreversibility rate of the system

Fig. 15

Effect of air–fuel ratio on generated electricity price in the system

Fig. 16

Effect of air–fuel ratio on purchase, installation, and implementation costs of the system

Fig. 17

Effect of air–fuel ratio of fuel cell cycle on efficiency and generated electricity price

Fig. 18

Effect of air–fuel ratio of gas turbine cycle on efficiency and generated electricity price

## Errata

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