Abstract
This paper presents the work for efficiency enhancement on a hybrid power system with an irreversible Solid Oxide Fuel Cell (SOFC) and Stirling Engine (SE) for various system design using the approach of finite-time thermodynamics. The SOFC-based cogeneration system was integrated with an SE and several heat components. The effects of design configurations using various interface components on system performance were investigated. By analyzing the SE with finite-time thermodynamics and considering multiple irreversible factors of output power given by the SOFC, the efficiency of the calculation can be more practical and accurate. In this study, the working efficiency of the proposed hybrid system was enhanced by 16.37% compared to that of the conventional system at an intermediate temperature of 873 K. The design approach proposed herein is considered an essential package for building highly efficient power systems working in the intermediate temperature range.
Highlights
The Solid Oxide Fuel Cell (SOFC) offers high efficiency and low-pollution technology to generate electric power
Based upon the simulation results presented in this study, the power generation and efficiency of the hybrid SOFC-Stirling Engine (SE) system was carefully studied using finite-time thermodynamics
To improve the efficiency of the hybrid system, several new design configurations under two different operating temperatures were studied, and we compared them to the results presented in the literature
Summary
The Solid Oxide Fuel Cell (SOFC) offers high efficiency and low-pollution technology to generate electric power. Based on the fact that the exhaust gas of the SOFC system is usually of high temperature, the system can be used to combine with different engines to construct a hybrid system for better electric power output and system efficiency. In earlier work, the SOFC was combined with a gas turbine (GT) [3] to utilize the exhaust gas, which includes nitrogen, oxygen, carbon dioxide, carbon monoxide, and vapor when using hydrocarbon fuel for the SOFC system, into GT in power generation processes. By utilizing the exhausted high-temperature gas, the efficiency of both the thermal energy and power generation for the hybrid system was enhanced
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