Yazar "Jayakumar, Arunkumar" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Polymer based flow field plates for polymer electrolyte membrane fuel cell and the scope of additive manufacturing: A techno-economic review
    (WILEY, 2022) Madheswaran, Dinesh Kumar; Jayakumar, Arunkumar; Velu, Rajkumar; Raj, Rajendran; Varuvel, Edwin Geo
    Flow field plate (FFP) is an integral polymer electrolyte membrane fuel cell (PEMFC) stack component that has multifunctional applications, such as facilitation of the reactant flow, transfer current from cell-to-cell, heat dissipation and product water removal. The conventional FFPs are made of graphite or metals, with their limitations, such as low corrosion resistance, heavyweight, high-cost and complex manufacturability, which hinders the commercialization of PEMFCs. On the contrary, polymer composites are lightweight and low-cost materials with good anti-corrosion attributes. It is also evident that polymer composites are the primary choice of material in a wide range of additive manufacturing (AM) processes, given their unique attributes such as design freedom, the capability to fabricate intricate flow channel geometry and minimize material wastage. However, incorporating the AM process for FFP design involves substantial challenges and consequently the present paper performs a comprehensive review on the diverse literature limited to polymer composite FFPs developed in recent years (2011-2021) with an intention of providing a holistic insight on development of cost-effective, high-strength-weight FFPs. The review also provides the prospectus of applying AM technology for fabricating polymer-based composites for FFP applications. Finally, a holistic meta-analysis is performed on strength and weakness of using polymer composite FFP, and the outlook is summarized.
  • Küçük Resim
    Öğe
    Recent advancement on thermal management strategies in PEM fuel cell stack: a technical assessment from the context of fuel cell electric vehicle application
    (TAYLOR & FRANCIS, 2022) Madheswaran, Dinesh Kumar; Jayakumar, Arunkumar; Varuvel, Edwin Geo
    Effective thermal management strategy for the polymer electrolyte membrane fuel cell (PEMFC) stack is critical in maintaining the overall stack efficiency and durability. The present assessment critically explores the recent developments (predominantly last decade) in thermal management strategies of PEMFCs, which encompasses an in-depth analysis of the thermodynamics, corresponding effects on components of PEMFC and the waste heat recovery system. In general, the operating temperature range of a PEMFC is 60-80 degrees C. Entropy consequence and irreversible transport mechanisms of the reactants are the major contributions to heat generation. Air cooling is employed for compact stacks of less than 5 kW and water cooling is favored for stacks greater than 5 kW. Cooling using nanofluids enables better cooling efficiency than water while downsizing the size and weight of the system. Phase change cooling strategy to attain greater heat removal capacity is broadly employed for stacks greater than 10 kW, which is beneficial in a compact size of the cooling system contrasted to the water cooling system. Passive cooling methods employing vapor chamber, heat pipes and heat spreaders used were another cooling system for stack power ranges between 5 and 10 kW which have the benefit of reduced parasitic losses. In addition to thermal management strategies, integral challenges associated with each thermal management strategy is identified. Discussion on cold start thermal management of fuel cell electric vehicles was provided. Finally, the waste heat recovery system of energy efficiency and overall future prospectus for the betterment of thermal management of PEMFC is emphasized.