The Temperature-Interval Diagram TID

These three graphs will be illustrated using the hot and cold stream data provided in Table 6.1. 

Initial observations are that the TID graphically shows the possible matches between the hot and the cold streams that will not violate the minimum approach temperature. This is noted by ensuring the thermodynamic constraint that heat is only passed from a hot stream at a temperature interval equivalent to or higher than a cold stream temperature interval. Thus, the TID provides an overall quick, qualitative view of potential stream matches without an excess of information. 

Temperature Temperature Scale oQ Scale Target temperature 127 117 (outlej temperature) 

2 The Heat Pinch Composite Curves (Temperature-Enthalpy Diagrams) 

The portion of the hot composite curve and the cold composite curve shows the minimum cooling and heating utilities, respectively, that must be supplied. Increasing the minimum approach temperature will shift both curves farther apart, reducing the total heat integration 

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