Heat balances Terms Links

Contrary to the mass and the heat balance, the conservation equation of impulse mostly only serves to calculate the pressure drop in a reactor. It contains no source term and is thus not directly linked with the mass and heat balance, at least if the pressure drop does not have a pronounced influence on the concentrations of the reactants. Thus, the impulse balance is usually solved separately. 

Regarding the potential commercial use of millistructured reactors, one of the main aspects to be considered is its possible integration in industrial processes. In this context, not only the design of the reactor but also the way in which it interacts with the different equipment linked to it in terms of mass and heat balances should be taken into account. For the latter purpose, process simulation software such as Aspen HYSYS, Aspen Plus, PROMAX, UNISIM, and/or... 

But in most cases a simplified heat balance, which comprises only the most important terms on the right-hand side of Equation (10), is sufficient for safety purposes. Such an expression will be used in Section 11.2.4. The problems linked with the cooling of polymerization reactors are presented in detail in Section 11.4. 

A poorly balanced water distribution in the fuel cell can severely impair its performance and cause long-term effects due to structural degradation. If PEMs or CLs are too dry, proton conductivity will be poor, potentially leading to excessive joule heating, which could affect the structural integrity of the cell. Too much water in diffusion media (CLs and GDLs) blocks the gaseous supply of reactants. As these examples show, all processes in PEECs are linked to water distribution and the balance of water fluxes. 

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