Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed

Oshurbekov, Safarbek; Kazakbaev, Vadim; Prakht, Vladimir; Dmitrievskii, Vladimir; Gevorkov, Levon

doi:10.3390/app10248820

Cited by 23 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the effective functioning of hydraulic systems with pumping stations ensures energy saving requirements [2,3]. To solve the problems of energy saving at pumping stations, various methods and methods are used: the use of frequency converters [4,5,6], methods for choosing energy-efficient methods for regulating the operation of pumping units taking into account specific conditions [7], improving methods for calculating structures of structures [8], choosing equipment during reconstruction and modernization [9,10] and a rational control system of pumping stations [11,12,13]. Accurate energy consumption accounting is necessary to ensure the energy saving requirement and the application and implementation of the above methods and means [14,15].…”

Section: Introductionmentioning

confidence: 99%

Consumption of Irrigation Pumps Pumping Water with a High Content of Mechanical Impurities

Kan

Vatin

2023

E3S Web of Conf.

View full text Add to dashboard Cite

The water pumped by reclamation stations of the Republic of Uzbekistan contains many mechanical impurities. This negatively affects the operation of pumping units. There is a decrease in the operating parameters of the pumping unit and the associated increase in electricity consumption. Analysis of the alluvial regime of the main water sources of large pumping stations shows that the sediment concentration can reach values of 15-20 kg/m3 and, on average, up to 8-10 kg/m3 (i.e., exceed the permissible values according to the technical requirements for centrifugal pumps by 2-3 times). Based on the consideration of a two-phase liquid model (pure water and mechanical impurities) and formulas for determining the useful power, a dependence is derived to determine the magnitude of the increase in power consumption. According to this dependence, a graph of the dependence of the increase in the value of the required useful power depending on the concentration of mechanical impurities in the pumped water is constructed, which can be applied in practice during the operation of irrigation pumping stations. The results of a quantitative analysis of the influence of the content of mechanical impurities in the pumped water on the value of the pump's useful power showed that with average turbidity of the pumped water of 10 kg/m3, the overspending of electricity would be 1.75%. This is of great practical importance for the machine water lifting of the Republic of Uzbekistan (the main consumer of electricity in the agricultural sector), and the results can be used to develop an energy-saving strategy in the field of operation of irrigation pumping stations.

show abstract

Section: Introductionmentioning

confidence: 99%

Consumption of Irrigation Pumps Pumping Water with a High Content of Mechanical Impurities

Kan

Vatin

2023

E3S Web of Conf.

View full text Add to dashboard Cite

show abstract

“…Based on their respective mechanical models, Vermunt et al [20], Ogata et al [21], and Zheng et al [22] studied the characteristics of their research objects under variable rotating speeds, such as rotation stall, additives for drag reduction, and vibration behaviors. Owing to the potential energy savings, the implementation of variable-frequency drives in electric motors has also been evaluated [23][24][25]. Moreover, Tanaka and Tabaru [26] studied the transient behavior of a centrifugal pump during rapid start-up.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rotating Speeds and Thermodynamic Effects on LOX Turbopump Performance

Fu²,

Cong

et al. 2023

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

As a key factor of a reusable turbopump, axial thrust directly determines the reliability of the bears and seals, especially considering the influence of rotational speeds and thermodynamic effects. In this study, numerical simulations and experimental tests were conducted to explore the impact of rotational speeds and the divergences of the turbopump performance with/without the thermodynamic effects. The experimental data obtained at 15000 r/min are in good agreement with the numerical results, illustrating the validity of the numerical model. The results show that the head deviations based on the affinity laws are relatively smaller, only 0.1% difference at normal condition, yet the efficiency increases from 72.5% to 73.8%, which need to be modified through the formula correction. Notably, the axial thrusts acting on impeller are significantly affected by the rotational speeds, and the values at rated flowrate decrease 17.6% after increasing the operating condition to rated speed. The affinity laws are not applicable for obtaining the turbopump axial thrusts under different speeds. Furthermore, due to the changes of the local physical properties, the values of head coefficient and efficiency decrease 2.8% and 1.3% at rated flowrate, respectively, when the thermodynamic effects of liquid oxygen are considered. Meanwhile, the relative variations of axial thrust are between 1.46% and 3.74% within the whole flow range. Finally, an in-depth analysis of the internal flow was conducted through the velocity field and vorticity method. In conclusion, both the rotational speeds and thermodynamic effects significantly affect the performance of a cryogenic turbopump, especially the axial thrust, and the unsteady results of the rotor-stator cavity leakage flow need to be analyzed in the future.

show abstract

“…Parallel pump sets are often used to achieve this goal when large, high or wide flow regulation is required. When parallel pump sets are used, the life cycle cost of all components of a pumping station can be significantly reduced compared to a single pump unit of the same rated power [11] and [12]. Therefore, it is necessary to study the energy efficiency of the parallel pump set during the whole life cycle.…”

Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Full Life Cycle Energy Efficiency Multi-Objective Parallel Pump Sets

2022

View full text Add to dashboard Cite

Aiming at the problem that the current single-objective control model of parallel pumping groups only focuses on the optimization of energy efficiency of operating conditions and operating costs, and cannot adjust the real-time working conditions of the pump group according to the comprehensive energy efficiency state of the pump group in the whole life cycle and adjust the pump group operation strategy accordingly, A multi-objective optimal control model for energy efficiency of a pump set is proposed, which can adjust the weight coefficients of three objective functions autonomously according to the current energy efficiency state of the pump set in the whole life cycle. In this way, the high energy efficiency of the parallel pump group in the low wear stage, that is, the low target deviation and specific energy consumption, and the high reliability in the high wear stage, that is, the lower impeller load improves the efficiency of the pump group in the whole life cycle and extend the service life of the pump group. Determine the multi-objective energy efficiency optimization control model of the pump group, use the main function linear and geometric weighting method, the ideal point value, and the distance deviation method to determine the objective function, and solve the multi-objective ideal point model with the help of LINGO, and obtain the optimal solution of the highest system total efficiency, the lowest pump group specific energy consumption and the highest system reliability. Pareto Frontier Comparison is used to study the transversality of the ideal point model solution set. Experimental results show that through the distribution of the model solution in the indicator space, the model can adjust the control strategy according to the real-time state of the pump group by adjusting the target weight combination.INDEX TERMS Parallel pumping groups; energy efficiency optimization; full life cycle; multi-objective

show abstract

Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed

Cited by 23 publications

References 17 publications

Consumption of Irrigation Pumps Pumping Water with a High Content of Mechanical Impurities

Consumption of Irrigation Pumps Pumping Water with a High Content of Mechanical Impurities

Influence of Rotating Speeds and Thermodynamic Effects on LOX Turbopump Performance

Optimization Analysis of Full Life Cycle Energy Efficiency Multi-Objective Parallel Pump Sets

Contact Info

Product

Resources

About