**6. Conclusions**

244 Heat Exchangers – Basics Design Applications

(b)

(c) Fig. 18. Dynamic response of methane (a), hydrogen (b) and water (c) distributions when the

hot inlet temperature down to 1100K.

(a)

A compact heat exchange reformer for high temperature fuel cell systems is presented in this paper. Based on the volume-resistance characteristic modeling technique, the distributed-lumped parameter method, and the modular modeling idea, a simulation model that is suited for quick and real time simulations is completed. The model can predict the key distribution characteristic parameters and the influence of some factors, such as the steam to carbon ratio, catalyst reduced activity, and passage pressure. The dynamic results indicate that this kind of heat exchange reformer has a great thermal inertia.

Both the model and modeling method will be useful and valuable for other heat exchange reformer designs and optimization; it can also provide a reference for the design of the control system in the future.
