ABSTRACT
In this chapter, we have presented some of the basic principles, laws, and relations of engineering thermodynamics. This includes thermodynamic properties; energy forms such as heat, work, internal energy, enthalpy, and Gibbs function; the first and the second law of thermodynamics; ideal gas equation of states; and relations of change in enthalpy, entropy, and Gibbs function. A prior knowledge and a review of these materials are essential for clear understanding of the principles, analysis, and design of fuel cells that are presented in the next chapters. For more comprehensive reviews of engineering thermodynamics, the books by Moran and Shapiro (2008), Sonntag et al. (2003), and Cengel and Boles (2006) can be referred.
