By John von Neumann

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The spreadsheet allows to show the local outlet temperatures of both streams exactly at the position, where it occurs in the real configuration. So the result is presented in a form, which is easy to understand and to compare with other configurations. Conclusions The well-known formulae for the relationship between efficiency of a heat exchanger and the number of transfer units can be wrltten in a much more compact form by introducing a simple auxiliary function

65 respectively. Space precludes investigation of all possible process condition disturbances but reference [3] includes the following: variation of inlet temperatures, stream flowrates and fouling conditions. One of the more complicated investigations is reported here: variation of both stream flowrates concurrently. T~,out, The outlet temperatures Th,out and from the exchanger without by-pass but subject to the changing flowrates are shown temperatures. 8 of the specified flowrates. At values of disturbances more than zero, cold stream temperature decreases of the below hot stream the the outlet temperature of the desired exceeds the value, desired while value, the outlet therefore by-passing neither one nor both streams will help the streams to achieve their target temperatures.

T..... DISTURBANCE TABULATE DISTURBANCE. BY-PASS. NTU. C·,e,Th..... T..... Th..... out Fig. 3 The exchanger information Main Program Flow Diagram type required is initially to predict chosen, the and outlet the normal construction temperatures from the specifications of flowrates and inlet temperatures are used in subroutine PASS. Appropriate correlations for predicting the heat transfer coefficients on the tube and shell sides must be included in PASS. The 44 various changes temperatures, process in process fouling condition conditions coefficients change, the or are then flowrates.

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