concept of a heated dry air input. It is known that the amount of vapor carried by the air
increases with increasing temperature, but further studies need to be conducted to
determine the effect of a heated air input on the DDD process. Thus the goals of this
study are as follows:
1. Design and install an air heated section to the DDD facility that is fully
instrumented to measure the appropriate heat and mass transfer rates.
2. Take experimental measurements over a range of flow conditions for two
separate cases: the case where both inlet air and inlet feedwater are heated
and the case with a heated air input with an ambient water input.
3. Develop and implement a mathematical model to correctly predict the heat
and mass transfer behavior of the two cases.
4. Perform a parametric study to determine the optimal operating conditions.
5. Perform an economic study to determine the practicability of the DDD
process for the two different cases.
Chapter 2 describes the DDD process constructed and maintained for the current
research. The instrumentation, the individual components, and software used to collect
the data are all described in detail.
A theoretical model for a heated air input for both an ambient water input as well as
a heated water input is presented in detail in Chapter 3. A control volume approach is
taken to reduce the conservation equations to determine the governing equations of the
two processes. The results for the two different cases will then be compared to the model
and then discussed.
Finally, in Chapter 4, the results from a study to determine the optimal conditions
for both cases are presented. The economics of the process are also explored in an
example of the DDD process coupled with an industrial plant.