Thermodynamic and economic assessment of a PEMFC-based micro-CCHP system integrated with geothermal-assisted methanol reforming |
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| Affiliation: | 1. College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China;2. School of Information Science and Engineering, Central South University, Changsha 410082, China;3. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China;1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Wuhan Second Ship Design and Research Institute, Wuhan 430064, China;3. School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430048, China;1. Department of Mechanical Engineering, University College of Nabi Akram, Tabriz, Iran;2. Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;1. Graduate School, Inha University, Incheon 22212, Republic of Korea;2. Dept. of Mechanical Engineering, Inha University, Incheon 22212, Republic of Korea;1. Department of Chemical Engineering, Faculty of Engineering, Srinakharinwirot University, Nakhon Nayok 26120, Thailand;2. Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25C, Graz 8010, Austria |
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| Abstract: | A micro-combined cooling heating and power (CCHP) system integrated with geothermal-assisted methanol reforming and incorporating a proton exchange membrane fuel cell (PEMFC) stack is presented. The novel CCHP system consists of a geothermal-based methanol steam reforming subsystem, PEMFC, micro gas turbine and lithium bromide (LiBr) absorption chiller. Geothermal energy is used as a heat source to drive methanol steam reforming to produce hydrogen. The unreacted methanol and hydrogen are efficiently utilized via the gas turbine and PEMFC to generate electricity, respectively. For thermodynamic and economic analysis, the effects of the thermodynamic parameters (geothermal temperature and molar ratio of water to methanol) and economic factors (such as methanol price, hydrogen price and service life) on the proposed system performance are investigated. The results indicate that the ExUF (exergy utilization factor the exergy utilization factor), TPES (trigeneration primary energy saving) and energy efficiency of the novel system can be reached at 8.8%, 47.24% and 66.3%, respectively; the levelized cost of energy is 0.0422 $/kWh, and the annual total cost saving ratio can be reached at 20.9%, compared with the conventional system. The novel system achieves thermodynamic and economic potential, and provides an alternative and promising way for efficiently utilizing abundant geothermal energy and methanol resources. |
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| Keywords: | PEMFC CCHP Methanol steam reforming Geothermal System efficiency |
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