Pumps composite curves

Figure 8-3 Typical pump composite curve. (From TRW Mission Pump Brochure [manufacturer s catalog.])...

As with heat pumping, the grand composite curve is used to assess how much heat from the process needs to be extracted into the refrigeration system and where, if appropriate, the process can... 

Figure 6 9 The grand composite curve can be used to size heat pump cycles. (From Smith and Unnhoff, Trans. IChemE, ChERD, 66 195, 1988 reproduced by permission of the Institution of Chemical Engineers.)...

Figure 16.38 shows a heat pump appropriately integrated against a process. Figure 16.38a shows the overall balance. Figure 16.38b illustrates how the grand composite curve can be used to size the heat pump. How the heat pump performs determines its coefficient of performance. The coefficient of performance for a heat pump can generally be defined as the useful energy delivered to the process divided by the power expended to produce this useful energy. From Figure 16.38a ...

Using the grand composite curve, the loads and temperatures of the cooling and heating duties and hence the COPhp of integrated heat pumps can be readily assessed. 

Figure 16.38 The grand composite curve allows heat pump cycles to be sized.

Figure 22.5 shows the grand composite curve for this process and the location of the evaporator heat pump. The... 

Most pump manufacturers provide composite curves, such as those shown in Fig. 8-3, that show the operating range of various pumps. For each pump that provides the required flow rate and head, the individual pump characteristics (such as those shown in Fig. 8-2 and Appendix H) are then consulted. The intersection of the system curve with the pump characteristic curve for a given impeller determines the pump operating point. The impeller diameter is selected that will produce the required head (or greater at the specified flow rate). This is repeated for all possible pump, impeller, and speed combinations to determine the combination that results in the highest efficiency (i.e., least power requirement). Note that if the operating point (Hp, Q) does not fall exactly on one of the (impeller) curves, then the... 

COMPOSITE CURVES MISSION PUMPS Slurry Scrv/cc... 

The objective of this work is to simulate the depropanizer distillation column of the NGL plant to compare the costs of the conventional distillation with the cost of a heat pump distillation system. Using the column grand composite curves (CGCC) of the depropanizer distillation column, the depropanizer column is suitable for retrofitting by... 

FIGURE 8-4 Composite curve for the performance of a pump showing head versus flow and efficiency versus flow at various speeds. 

Figure 15.3 shows a typical time versus consistency graph for a permafrost-sealant test composition. The low initial Be ensures a low yield stress and pumping viscosity. The increase in Be is gradual, indicating slow dissolution of MgO and wollastonite in the solution. As the Be increases, its rise to 70 is rapid, and the time versus Be curve is almost vertical. Such behavior ensures that the slurry, once placed, will set rapidly. 

Breakthrough curve The concentration profile observed at the column exit as a response of the column to an abrupt change in the composition of the mobile phase stream pumped at the inlet. 

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