Performance of a micro-thermophotovoltaic power system using an ammonia-hydrogen blend-fueled micro-emitter

Lee, S.I.; Um, D.H.; Kwon, Oh Chae

doi:10.1016/j.ijhydene.2013.05.010

Cited by 59 publications

(9 citation statements)

References 21 publications

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“…They conducted a detailed parametric study on the geometry of ribs to achieve maximum wall temperature and uniform temperature distribution. Since, the conventional chemical batteries are outperformed due to aforementioned issues, several combustion-based micropower generation systems such as micro gas turbine [22], micro thermophotovoltaic generators [23,24], fuel cells [25] and thermoelectric generators [26][27][28][29][30], were recently proposed and investigated. Although, heat engines could be commonly proposed, their significant heat and friction losses due to the presence of moving parts make them impractical for various applications at such small scales because of strong noise and low conversion efficiencies.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

2018

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A new concept of dual microcombustor based thermoelectric micropower generator with high power density (~0.14 mW/mm 3) and high conversion efficiency (4.66 %) is reported in this work. A new configuration with a dual microcombustor system is experimentally investigated with two thermoelectric modules and operates with liquefied petroleum gas as fuel. The dual microcombustor is fabricated using a rectangular aluminium metal block and detailed investigations on flame stability limits and thermal characteristics were carried out. Dual microcombustor configuration helps to significantly improve the flame stability limits and thermal characteristics over the single combustor configuration due to increased flame-surface interaction and enhanced heat recirculation through solid walls. Maximum power point tracking (MPPT) algorithm is applied to achieve a maximum power output of 4.52 W with a maximum conversion efficiency of 4.66 %. The application of porous media significantly helped improve the upper flame stability limits with a maximum conversion efficiency of 4.32 %, and 4.66 %, at  = 1 and 0.9 respectively at 10 m/s mixture velocity. The system compactness and high output power with significantly improved conversion efficiency shows the possibility of its application in various portable micro-scale power generators for remote, stand-alone, military and aerospace applications.

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Section: Introductionmentioning

confidence: 99%

“…Several efforts have been made by researchers on TPV [23,24] and fuel cell [25] based micropower generators. Yang et al [23] developed a micro thermophotovoltaic power generator using backward stepped combustor with 0.113 cm 3 volume.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

2018

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“…3,4 Many concepts have been proposed to convert the heat energy released from combustion to electrical power such as Micro-gas turbine engines, 1,5 Wankel engines, 3 micro thermoelectric, [6][7][8][9][10][11] and micro thermophotovoltaic systems. [12][13][14] The performance of many of these systems deteriorates due to high surface-area to volume ratio which increases the heat-loss from microcombustor to surroundings. However, the increased heat-loss from microcombustor walls is advantageous towards the design of non-mechanical power generators, such as thermophotovoltaics (TPV) and thermoelectrics (thermoelectric power generator, TEG), and expected to help improve their overall energy conversion efficiency.…”

mentioning

confidence: 99%

“…Many researchers have invested significant efforts towards the development of such systems using the concept of thermophotovoltaics. [12][13][14] Recently, Park et al 12 and Lee et al 13 have achieved an overall conversion efficiency of 2.1% and 2.3% using TPV concept with propane-air mixture in a micro combustor. Chan et al 8 and Marton et al 9,10 reported an overall efficiency of 2.5% using a catalyst based microcombustor and Bismuth-Telluride based thermoelectric modules.…”

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A prototype micro-thermoelectric power generator for micro-electromechanical systems

Yadav

Sharma

Yamasani

et al. 2014

Applied Physics Letters

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A prototype micro-thermoelectric power generator (micro-TEG) system based on micro-combustion concept has been developed and presented here. The system consists of Bismuth-Telluride based thermoelectric modules mounted on a 0.5 cm3 volume microcombustor. The hot combustion gases from the microcombustor are allowed to flow in reverse direction through a heating cup to maximize the heat transfer from hot combustion products to thermoelectric modules. The system delivers a maximum power of 2.35 W with a fuel (propane) flow rate of 3.98 g/h. Maximum power is achieved at a voltage of 4.34 V, current 0.54 A with a maximum conversion efficiency of 4.58%. The system generates electric power with an improvement of over 83% in energy conversion efficiency over existing micro-TEG systems.

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Combustion characteristics of hydrogen‐air mixture in a radial micro combustor for using in thermophotovoltaic devices

2021

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Requirement of a fast rechargeable and powerful energy source for micro scale devices leads to increase attentions to various micro combustors for usage as heat source in micro thermophotovoltaic devices. Meanwhile, extracting as much thermal energy as possible from chemical energy of fuel by testing a variety of shapes of micro combustion chambers is at the heart of micro combustion subject. Present research has been purposed to find out performance and feasibility of a radial micro combustion chamber by numerical study of combustion characteristics of H 2 -air pre-mixture and calculation of emitter and total efficiency of the system. Governing equations are considered three-dimensional, incompressible, and steady state for turbulent combustion. In addition, detailed kinetics of H 2 -air combustion is chosen for the combustion mechanism. Inlet velocity, equivalence ratio, and wall material properties consisting of emissivity and thermal conductivity with external thermal convection coefficient are parameters, which have been chosen for investigations. Results indicated drastic effect of inlet velocity on the location of combustion zone. In fact, increasement of the inlet velocity causes to transfer combustion zone to the wall, which leads to increase wall temperature and consequently, emitter and total efficiency of the system. Equivalence ratio has more impact on the combustion temperature. While wall thermal conductivity and wall radiation emissivity play a decisive role in the total efficiency of the system. It was founded as the wall radiation emissivity decreases, heat recirculation increases. It causes to expand high temperature zone through the fluid and wall so that the total efficiency increases.By considering the present radial micro combustion chamber as a heat source for a micro thermophotovoltaic device, it was founded that maximum total efficiency of 3.14% is accessible for the condition in which the outer wall surface has maximum average temperature. Highlights• The inlet velocity has drastic impact on the radiation heat transfer rate.• Existence of the vortexes is suitable for intensifying the reactions.• Wall thermal conductivity has maximum effect on the emitter and total efficiency.

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Performance of a micro-thermophotovoltaic power system using an ammonia-hydrogen blend-fueled micro-emitter

Cited by 59 publications

References 21 publications

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

A prototype micro-thermoelectric power generator for micro-electromechanical systems

Combustion characteristics of hydrogen‐air mixture in a radial micro combustor for using in thermophotovoltaic devices

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