Lecture_F11_ECH157_Project_Help

Lecture_F11_ECH157_Project_Help - University of California,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: University of California, Davis Department of Chemical Engineering & Materials Science ECH 157 - Fall 2011 Answers to Projects Frequently Asked Questions Questions about the fuel cell model: 1. The term n r H 2 that appears in the stack temperature equation represents the number of moles of H 2 consumed due to the reaction per unit time (it is essentially the reaction rate). It is a function of the load current, and its dependency on I can be easily deduced by inspecting the mass balance equation for H 2 ; specifically n r H 2 = 2 K r I . 2. The outlet molar ow rate for each species is not constant, but a function of the partial pressure (think of the ideal gas law). Again, the relationship can be deduced from the mass balance equations. For example, q out H 2 = K H 2 p H 2 (check the units to convince yourself of the result). 3. The inlet molar ow rates for H 2 and O 2 are specified in Table 1, but the inlet molar ow rate for H 2 O is not given because it is zero, since the feed contains no water, and water is only...
View Full Document

Page1 / 2

Lecture_F11_ECH157_Project_Help - University of California,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online