Common use of Performance Parameters Clause in Contracts

Performance Parameters. The main aim of this optimisation is to improve the overall efficiency of the CRPT while maintaining the required head. The efficiencies are to be maximized in each mode of operation, but more importantly the combined pump-turbine mode of operation should guarantee a very good efficiency. To achieve this, the power consumption in pump mode of operation must be minimized and the power produced in turbine mode of operation must be maximized. Hence it is logical to use power in each mode of operation across the range of operation as optimisation objectives. So the objectives used for the optimization are as stated below: ➢ Maximize power produced in turbine mode for all the 3 operating points ➢ Minimize power consumed in pump mode across all the 3 operating points It is to be ensured that the designs satisfy the minimum head requirements in pump mode for the lab test. Considering the final details available for the test facility at TU Braunschweig, the pump is required to deliver a minimum head of 7 [m] to cover for the basin level differences and the losses in the pipes. Hence the minimum head requirements are specified as a constraint. Also the cavitation performance as assessed by the NPSHr parameter is to be better for the new designs compared to the baseline. Hence NPSHr is mentioned as a constraint. The constraints used in the optimization are as stated below: ➢ NPSHr, for both Rotor1 and Rotor2, at 3 different flow rates in pump mode with an upper limit same as that of baseline design ➢ A minimum head at each operating point in pump mode Optimization process in the end produces an optimized candidate in addition to a set of points representing the Pareto front of optimization. A CFD simulation is carried out for 4 of the chosen designs, which are selected from the Pareto front.