Comparing the ways of increasing the pump efficiency in the nonoptimal operating modes

The article considers and compares the main ways of increasing the efficiency of the pump working at slow circulating rate. In the first case the pump impellor is replaced by the impellor designed for the slower circulating rate. In the second case, apart from the impellor replacement, the vaned diffuser is added into the pump configuration. We show the way of modelling the diffuser by means of pseudorandom numbers generation method (Sobol Method). The article estimates the economic benefits of the considered upgrading ways. The obtained results show the efficiency of replacing the pump rotor in order to increase its efficiency for operating at slow circulating rate.

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