Maximum efficiency of direct energy conversion systems. Application to fuel cells

被引：10
|
作者：
Linares, J. I. [1 ]
Herranz, L. E. [2 ]
Moratilla, B. Y. [1 ]
机构：
[1] Comillas Pontifical Univ, Dept Mech Engn, Madrid 28015, Spain
[2] CIEMAT, Unit Nucl Safety Res, E-28040 Madrid, Spain
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2011年 / 36卷 / 16期
关键词：
Fuel cells; Second law of thermodynamics; Irreversibilities; Exergy; Direct energy conversion systems; POWER-GENERATION; PERFORMANCE;
D O I：
10.1016/j.ijhydene.2011.04.231
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This work develops a methodology to calculate the maximum First Law efficiency of any power device. To do so external irreversibilities due to heat transfer are suppressed by means of Carnot engines which mechanical work is added up to the one resulting from the device under hypothetical internally reversible mode of operation. By applying the developed methodology comparisons between Direct Energy Conversion Systems (DECS) and power cycles can be properly set on balanced assumptions in each type of device. In this paper, the main equations of the methodology are presented and the specific equations for fuel cells are derived. The potential of this methodology is illustrated by comparing fuel cells and power cycles First Law efficiency as a function of temperature. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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页码：10027 / 10032
页数：6
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