Power and heat co-generation by micro-tubular flame fuel cell on a porous media burner

Wang, Yuqing; Zeng, Hongyu; Shi, Yixiang; Cao, Tiantian; Cai, Ningsheng; Ye, Xiaofeng; Wang, Shaorong

doi:10.1016/j.energy.2016.04.095

Cited by 38 publications

(19 citation statements)

References 27 publications

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“…Secara umum banyak metode dan teknik yang telah dikembangkan dalam penilaian perusahaan, diantaranya adalah: a) pendekatan laba antara lain metode rasio tingkat laba atau Price Earning Ratio, metode kapitalisasi proyeksi laba; b) pendekatan arus kas antara lain metode diskonto arus kas; c) pendekatan dividen antara lain metode pertumbuhan dividen; d) pendekatan aktiva antara lain metode penilaian aktiva; e) pendekatan harga saham; f) pendekatan Economic Value Added (Suharli, 2006). Adapun pendekatan penciptaan nilai bagi pemegang saham juga diidentifikasi oleh Rappaport (2006) yaitu, keunggulan operasional, struktur finansial yang optimal, berfokus, memiliki pertumbuhan laba yang kredibel, informasi atau pengungkapan laporan keuangan yang komunikatif oleh perusahaan dan pembelian saham kembali.…”

Section: Telaah Pustaka Penciptaan Nilai Pasar Perusahaanunclassified

Penciptaan Nilai Pasar oleh Perusahaan Terpercaya

Yovita¹,

Kristianti

2019

persi

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Penelitian ini bertujuan untuk menguji pengaruh kinerja profitabilitas (Return on Assets dan Return On Equity), Corporate Governance (Corporate Governance Perception Index) terhadap penciptaan nilai pasar perusahaan. Penelitian ini menggunakan sampel 40 perusahaan go public di Bursa Efek Indonesia yang masuk dalam pemeringkatan CGPI tahun 2007-2010 pada periode survei tahun 2006-2009. Berdasarkan hasil analisis regresi berganda dengan tingkat signifikansi 5%, ditemukan bahwa kinerja profitabilitas (ROA) dan Corporate Governance (CGPI) berpengaruh positif signifikan terhadap penciptaaan nilai pasar (MVA growth). Lain halnya dengan hasil ROE yang berpengaruh tidak signifikan terhadap MVA growth. Impikasi studi ini antara lain: (1) memberikan bukti empiris tentang proses penciptaan nilai pasar dan memperkuat teori yang berkaitan dengan penciptaan nilai pasar, yaitu Teori Sinyal, Shareholder Value Creation), dan Teori Keagenan, (2) memberikan gambaran aplikatif penciptaan nilai pasar perusahaan berkesimbungan dengan mencapai kinerja profitabilitas yang menjadi target menjadi target bersama antara pemegang saham dan pihak manajemen, penerapan Good Corporate Governance.

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Section: Telaah Pustaka Penciptaan Nilai Pasar Perusahaanunclassified

Penciptaan Nilai Pasar oleh Perusahaan Terpercaya

Yovita¹,

Kristianti

2019

persi

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“…Extensive studies have already been carried out on the performance of fuel cell CHP. It is widely recognized that a fuel cell can operate under a consistent net electric efficiency (around 40%) , and the overall CHP efficiency could be over 85% regardless of the size, in comparison with the obvious electric efficiency drop of the conventional heat engine as the size goes down . Note that these efficiencies are mostly evaluated under a static condition where the generated power and heat of the fuel cell are assumed to be fully consumed.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Residential Micro-Cogeneration System Based on a Fuel Cell Using Dynamic Programming-Based Economic Day-Ahead Scheduling

Sun

Jin

Shen

et al. 2021

ACS Sustainable Chem. Eng.

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Fuel cells are widely deemed as a sustainable cogeneration technology that promises great decarbonization potential. However, economic operations of such sustainable energy systems are challenging because of the coupling between the heat and power generation, as well as the imbalance between the production and consumption. To this end, this paper proposes an economic day-ahead scheduling strategy for a sustainable cogeneration system, consisting of fuel cell, battery, thermal energy storage (TES), and heat pump. Based on the component models, a dynamic programming framework is formulated, in which the optimization objective is minimizing the accumulative fuel consumption and the constraints are derived from safety requirements. Optimization based on a typical 24-h load profile results in an hourly heat and power flow pattern to exhibit a highly coordinated and complementary operation scenario within the whole planning horizon. The benefits of energy storage are fully exploited and the energy-saving potential of each component is explored. It is revealed that the incorporation of TES into the sustainable energy systems brings about 3.5% overall efficiency improvement and healthier battery operations. The effects of TES capacity on the efficiency of the sustainable energy systems are also discussed.

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“…Porous burners and heat exchangers are also part of novel and different applications. For instance, Wang et al (2016) use a two-layer porous media burner on a fuel call. The stable operation limits of the burner are obtained by adjusting the inlet gas velocity and the equivalence ratio.…”

Section: Introductionmentioning

confidence: 99%

Internal flow analysis of a porous burner via CFD

Abdulkarim

Ateş

Altınışık

et al. 2019

HFF

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Purpose This study aims to introduce a metal porous burner design. Literature is surveyed in a comprehensive manner to relate the current design with ongoing research. A demonstrative computational fluid dynamics (CFD) analysis is presented with projected flow conditions by means of a common commercial CFD code and turbulence model to show the flow-related features of the proposed burner. The porous metal burner has a novel design, and it is not commercially available. Design/methodology/approach Based on the field experience about porous burners, a metal, cylindrical, two-staged, homogenous porous burner was designed. Literature was surveyed to lay out research aspects for the porous burners and porous media. Three dimensional solid computer model of the burner was created. The flow domain was extracted from the solid model to use in CFD analysis. A commercial computational fluid dynamics code was utilized to analyze the flow domain. Projected flow conditions for the burner were applied to the CFD code. Results were evaluated in terms of homogenous flow distribution at the outer surface and flow mixing. Quantitative results are gathered and are presented in the present report by means of contour maps. Findings There aren’t any flow sourced anomalies in the flow domain which would cause an inefficient combustion for the application. An accumulation of gas is evident around the top flange of the burner leading to higher static pressure. Generally, very low pressure drop throughout the proposed burner geometry is found which is regarded as an advantage for burners. About 0.63 Pa static pressure increase is realized on the flange surface due to the accumulation of the gas. The passage between inner and outer volumes has a high impact on the total pressure and leads to about 0.5 Pa pressure drop. About 0.03 J/kg turbulent kinetic energy can be viewed as the highest amount. Together with the increase in total enthalpy, total amount of energy drawn from the flow is 0.05 J/kg. More than half of it spent through turbulence and remaining is dissipated as heat. Outflow from burner surface can be regarded homogenous though the top part has slightly higher outflow. This can be changed by gradually increasing pore sizes toward inlet direction. Research limitations/implications Combustion via a porous medium is a complex phenomenon since it involves multiple phases, combustion chemistry, complex pore geometries and fast transient responses. Therefore, experimentation is used mostly. To do a precise computational analysis, strong computational power, parallelizing, elaborate solid modeling, very fine meshes and small time steps and multiple models are required. Practical implications Findings in the present work imply that a homogenous gas outflow can be attained through the burner surfaces while very small pressure drop occurs leading to less pumping power requirement which is regarded as an advantage. Flow mixing is realizable since turbulent kinetic energy is distinguished at the interface surface between inner and outer volumes. The porous metal matrix burner offers fluid mixing and therefore better combustion efficiency. The proposed dimensions are found appropriate for real-world application. Originality/value Conducted analysis is for a novel burner design. There are opportunities both for scientific and commercial fields.

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Power and heat co-generation by micro-tubular flame fuel cell on a porous media burner

Cited by 38 publications

References 27 publications

Penciptaan Nilai Pasar oleh Perusahaan Terpercaya

Penciptaan Nilai Pasar oleh Perusahaan Terpercaya

Sustainable Residential Micro-Cogeneration System Based on a Fuel Cell Using Dynamic Programming-Based Economic Day-Ahead Scheduling

Internal flow analysis of a porous burner via CFD

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