Temperature-interval diagram

Figure 9.10 The temperature interval diagram for the pharmaceutical case study.

Thermodynamic and economic aspects of the preceding evolutionary rules can be illustrated by translating them into a set of basic on-diagram modifications (BODM), These modifications can be applied directly on a heat content diagram or temperature interval diagram for the systematic evolutionary synthesis of energy-optimum and minimum-cost networks. For... 

The evolutionary development method of Linnhoff and Flower (2 ) utilizes the temperature interval diagram to represent an initially created network and also the concept of the freedom (F) of an exchanger. The latter has the physical dimension as a heat load (kW) and is related to the larger heat capacity flow rate of the two streams matched in an exchanger (CPL), the smallest actual temperature difference within the exchanger (AT ) and the minimum approach temperature of the exchanger (AT ) according to the expression... 

Figure 8b. Problem 7SP1 temperature interval diagram for the...

First, the TID is a temperature plot, not to scale, of all hot and cold streams to be analyzed. Two temperature scales are shown on the TID, the hot temperature scale and the cold temperature scale. A minimum temperature driving force, pre-selected by the designer, separates the hot and cold temperature scales numerically and this minimum temperature driving force is the minimum temperature difference between a hot and cold stream to be allowed on either end of a counter-current heat exchanger. Each hot and cold steam is represented on the TID as an individual arrow whose tail is the supply temperature and whose head is the target temperature. Figure 6.2 shows an example temperature-interval diagram with two hot streams and two cold streams plotted. 

Figure 6.2 Temperature-interval diagram (TID) with shifted temperature scales.

Figure 6.7 Temperature-interval diagram and enthalpy-mapping diagram for a moderately sized industrial problem.

Design Above the Pinch. To start, draw the temperature interval diagram above the pinch. Figure 15.6. The algorithm used to design the network starts by matching hot and cold streams at the pinch and then moving away from the pinch. 

Design Below the Pinch. The approach for the design below the pinch is similar to that described for above the pinch. Start at the pinch and match streams, and then move away from the pinch and match the remaining streams. The temperature interval diagram below the pinch is shown in Figure 15.7rak... 

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