Energy performance index

Let a ratio of actual energy performance (AEP) and guideline energy performance (GEP) be defined as below. This ratio shall be labeled the energy performance index... 

Usually, the survey group is divided into a tiered performance structure such as first, second, third, and fourth quartiles. Based on the energy performance index calculated above, you can find out which performance quartile your process unit belongs to. This indicates where your process unit stands among your peers. 

AEP actual energy performance BFW boiler feed water EPl energy performance index... 

With simulated annealing, an energy term E is defined, which then becomes the performance index to be minimized. For a given energy change AE at temperature T, the probability P of accepting a solution is... 

Figure 9.9 shows HP steam consumption under different parameter settings of A, B, and C. Solution D was omitted as the differences between D and C are relatively small. For this performance index, solution A consumes the least steam while solution C the most. Here, the steam consumption of solution C was sacrificed to achieve more gains in the fuel gas and energy gain. The cost of steam consumption is calculated in Table 9.7. 

To better illustrate the effect of the optimization process, Table 9.10 summarizes the various key performance indexes considered in terms of dollars. The best solution is point C optimized by MOEA, where the total consumption of fuel and steam is the lowest while the energy gain is the highest. However it has the highest steam consumption. 

The index that maximizes the energy dissipated by the viscous dampers Jl) tends to locate dampers where the velocity is higher and this usually happens in the upper floors. Therefore this performance index moves the dampers in the uppers floors. Instead the index that maximizes the damping ratio (J2) is not very sensitive and it does not bring to realistic distributions. 

Lavan Method The Levy and Lavan (2006) fully stressed analysis/redesign procedure uses a single active ground motion, selected based on its high displacement or energy demands. A response analysis is performed using this ground motion, and the objective function, or performance index, is calculated as the value of a chosen response parameter at story / normalised by an allowable value. In this study the parameter chosen is the interstory drift 8-. 

Filiatrault and Cherry (1988) proposed to determine the optimum activation of friction devices based on minimizing the Relative Performance Index, RPl, devised from the application of the energy concept. 

Valko et al. [37] developed a fast-gradient RP-HPLC method for the determination of a chromatographic hydrophobicity index (CHI). An octadecylsilane (ODS) column and 50 mM aqueous ammonium acetate (pH 7.4) mobile phase with acetonitrile as an organic modifier (0-100%) were used. The system calibration and quality control were performed periodically by measuring retention for 10 standards unionized at pH 7.4. The CHI could then be used as an independent measure of hydrophobicity. In addition, its correlation with linear free-energy parameters explained some molecular descriptors, including H-bond basicity/ acidity and dipolarity/polarizability. It is noted [27] that there are significant differences between CHI values and octanol-water log D values. 

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