Operating characteristics of the variable frequency speed-regulating system for a single pump in a closed system

Abstract

This study experimentally investigated the operating characteristics of the variable frequency speed-regulating system of a water pump in a closed system. The test data for the variable frequency water pump under various conditions were obtained by changing the water pump frequency and the opening setting of a regulator valve in the system. This study revealed that the total power ratio of the water pump system before and after the frequency adjustment did not exhibit cubic correlations with its rotational speed ratio as defined by the affinity law, especially in areas other than the high-efficiency area of pump operation. The equations that express the correlations between the frequency ratio and the total power ratio under the full range of operating conditions were obtained in this study by using the data fitting method. The test confirmed that the fitted characteristic equations had a higher precision and a wider scope of applicability than the existing equations when the water pump, motor, and variable frequency drive were considered as a whole. Practical application: The variable frequency speed-regulating system of a water pump was used in cooling, cooled and heating systems. However, the water pump power was calculated by the standard cube law, and its energy-saving potential was exaggerated. This study revealed a new energy model of a water pump system that can more accurately calculate the total power of the variable frequency water pump in practical engineering.

Steady state analysis of modern industrial variable speed drive systems using controllers adjusted via grey wolf algorithm & particle swarm optimization

“…This problem is usually solved in GWO where grey wolves have a specific hierarchical social sequence. Moreover, GWO algorithm easy to implement as it contains only some parameters which makes it superior to its predecessors [ 18 , 19 , 20 , 21 , 22 ].…”

“…Vectors are given according to the following equations [ 9 ]: Where components decrease linearly from throughout the iteration and vectors are random vectors ranges within [0,1]. determination of best hunting agent [ 9 ]: Determination of the current location for hunting agent using the following equation [ 20 , 21 , 22 , 23 , 24 , 25 ]: Assessment of fitness value for each stalker. Updating the values .…”

“…Determination of the current location for hunting agent using the following equation [ 20 , 21 , 22 , 23 , 24 , 25 ]:…”

Power characteristics of variable frequency speed control-based water pumps in open cooling water systems

“…According to literature, 14,15 the total power of the water pump variable frequency speed control system in opening cooling system was calcuated as following…”

Two-Stage Hybrid Model for Efficiency Prediction of Centrifugal Pump

“…Researchers have attempted to correlate the speed of centrifugal pump with the efficiency to make the prediction more accurate [9][10][11][12]. However, some assumptions include approximate values, especially ignoring the friction loss of pipeline system [7,[13][14][15][16]. Additionally, Sensors 2022, 22, 4300 2 of 18 the flow rate change at the same speed is mainly adjusted by the outlet throttle valve of system, and the friction loss of pipeline system changes constantly [12].…”