Information Technology Reference
In-Depth Information
Figure 9.10
Mheatx zone output.
performance of the exchanger; however, mechanical and other details are available
only after executing the B3shellandtube.bkp file and using the EDR browser in the
report mode of the results. An example is given in Figure 9.10. Note that there are
many detailed types of outputs which are selected from the left-hand-side column under
“shell and tube” by clicking on the plus sign, which exposes the reports available. The
choice of a different detailed design program involves the same techniques as those
described above.
9.3 MHEATX BLOCK
The Mheatx block Is unique in that it is able to handle multiple hot and cold streams.
The block is reorganized internally into a collection of Heater blocks connected by heat
streams. An example is given in Examples/mheatxexample. Here there is one Mheatx
block with two hot and two cold feeds. The primary input form is shown in Figure 9.11.
Note that a specification is required on all but one output stream. Selection of the tab
Zone Analysis permits the assignment of zones within the heat exchanger. Results are
shown in Figure 9.12. The analysis summary gives a breakdown of the important heat
exchange factors, including identification of the locations where streams should enter
and leave the exchanger.
9.4 WORKSHOPS
Workshop 9.1
Use the shortcut feature of the Heatx block to calculate the state of
the cold stream and the heat transfer area required when the streams in Table 9.1 are
passed through a countercurrent heat exchanger with an overall heat transfer coefficient
of 100 Btu/(hr-ft
2
-
◦
R). The outlet temperature desired for the hot stream is 70
◦
F. The
