Locating the greatest centrifugal pump energy savings

2004 ◽  
pp. 131-136 ◽  
Author(s):  
Stan Shiels
Keyword(s):  
Centrifugal Pump ◽  
Energy Savings ◽  
Pump Energy

scholarly journals Investigation of temperature drop in domestic hot water circuit

2018 ◽  
Vol 44 ◽  
pp. 00158
Author(s):  
Ilona Rzeźnik
Keyword(s):  
Experimental Investigation ◽  
Energy Savings ◽  
Temperature Drop ◽  
Pump Energy ◽  
Working Time ◽  
Hot Water ◽  
Single Family ◽  
Domestic Hot Water ◽  
Circulation Pump ◽  
Family House

The results of experimental investigation of determining the time of temperature drop in domestic hot water circuit were presented in this paper on the example of single-family house. The test were carried out on vertical sections of installations made of PE-X/Al/PE pipes (cross-linked polyethylene and aluminum) with and without insulation. The temperature drop process was investigated in temperature range typical for domestic hot water installation from 55ºC to 40ºC. On the basis of the obtained results with appropriate adjustment of the working time of circulation pump, energy savings of 90% were achieved.

Velocity Control of Hydraulic Cylinders With Only Pressure Feedback

2001 ◽  
Author(s):  
Christopher C. DeBoer ◽  
Bin Yao
Keyword(s):  
Energy Savings ◽  
Pump Energy ◽  
Hydraulic Cylinder ◽  
Sensor Failure ◽  
Velocity Control ◽  
Programmable Valve ◽  
Pressure Feedback ◽  
Hydraulic Cylinders ◽  
Velocity Tracking ◽  
Cartridge Valves

Abstract The lack of position or velocity feedback is a very common problem particularly on construction equipment such as excavators and backhoes. The extra cost of adding position/velocity sensors is prohibitive as well as the high likelihood of sensor failure in such a harsh environment. These factors make the possibility of improving control performance with limited sensory feedback very attractive. This paper studies the velocity control of a single-rod double actuating hydraulic cylinder utilizing a programmable valve with only cylinder pressure feedback. The boom motion control of a scaled-down model of an industrial backhoe loader arm is used as a case study. The programmable valve used in this study is a unique combination of five proportional cartridge valves connected in such a way that the meter-in and meter-out flows can be independently controlled by four of the valves as well as a true cross port flow controlled by the fifth valve. The programmable valve decouples the control of the meter-in and meter-out flows providing tremendous control flexibility to control the cylinder motion while decreasing the pump energy required by utilizing the potential and kinetic energy of the load. This paper demonstrates the potential energy savings possible through the use of the programmable valve. The paper also proves that significant improvements in the velocity tracking performance of hydraulic cylinders can be attained with only pressure feedback.

scholarly journals Power steering pump energy savings

1993 ◽  
Vol 1993 (2) ◽  
pp. 483-488 ◽  
Author(s):  
HIDEYA KATOH ◽  
YOSHIHARU INAGUMA ◽  
SEIJI KAWAKAMI
Keyword(s):  
Energy Savings ◽  
Pump Energy ◽  
Power Steering

Effect of Surfactant Additives on Centrifugal Pump Performance

2005 ◽  
Vol 128 (4) ◽  
pp. 794-798 ◽  
Author(s):  
Satoshi Ogata ◽  
Asano Kimura ◽  
Keizo Watanabe
Keyword(s):  
Centrifugal Pump ◽  
Energy Savings ◽  
Tap Water ◽  
Maximum Flow ◽  
Pipeline System ◽  
Pump Efficiency ◽  
Rotating Speed ◽  
Surfactant Solutions ◽  
Pump Head ◽  
Shaft Power

Performance of a centrifugal pump when handling surfactant solutions was measured experimentally. It was clarified that the pump efficiency with surfactant solutions was higher than that with tap water and increased with an increase in surfactant concentration. The value of maximum flow rate also increased. The total pump head increased with an increase in concentration, and the shaft power decreased with a decrease in the impeller rotating speed. There was an optimal temperature, which maximizes the efficiency. By combining the data for the piping section and for the pump efficiency, it is possible to accurately predict the energy savings of the pumping power in the pipeline system.

LAHU Heat Recovery System Optimal Operation and Control Schedules

2005 ◽  
Vol 128 (3) ◽  
pp. 360-366 ◽  
Author(s):  
Yujie Cui ◽  
Mingsheng Liu
Keyword(s):  
Thermal Energy ◽  
Heat Recovery ◽  
Energy Savings ◽  
Pump Energy ◽  
Weather Conditions ◽  
Optimal Operation ◽  
Air Handling Unit ◽  
Recovery System ◽  
Heat Recovery System ◽  
And Control

Optimal operation and control of heat recovery in an integrated Laboratory Air Handling Unit (LAHU) system differs substantially from that in conventional dedicated AHUs for laboratory buildings with a 100% outside air AHU for laboratory spaces, since the LAHU allows economizer operation for both offices and laboratories. Optimal operation and control schedules of the heat recovery systems in the LAHU have been developed to minimize the total thermal energy cost. This paper presents the procedure, methodology, and results of generic optimal heat recovery control schedules for the LAHU and investigates its impact on the LAHU potential thermal and pump energy savings. The optimal control schedule can potentially save 14% to 27% thermal energy and 17% to 100% pump energy during the winter under weather conditions that prevail in Omaha, Nebraska. The findings discussed in this paper also apply to any heat recovery system, where AHU has an economizer function.

Evaluation of Energy Savings for Inverter Driving Centrifugal Pump with Duty Cycles

2015 ◽  
Vol 18 (6) ◽  
pp. 81-85
Author(s):  
Kyungwuk Kim ◽  
Sang-Ho Suh ◽  
Rakibuzzaman Rakibuzzaman
Keyword(s):  
Centrifugal Pump ◽  
Energy Savings ◽  
Duty Cycles

scholarly journals Energy-saving potential for centrifugal pump storage operation using optimized control schemes

2021 ◽  
Vol 14 (2) ◽  
Author(s):  
Thomas Hieninger ◽  
Florian Goppelt ◽  
Ronald Schmidt-Vollus ◽  
Eberhard Schlücker
Keyword(s):  
Energy Saving ◽  
Centrifugal Pump ◽  
Energy Savings ◽  
Control Strategies ◽  
Frequency Converter ◽  
Operating Time ◽  
Speed Control ◽  
Centrifugal Pumps ◽  
Constant Flow Rate ◽  
Energy Saving Potential

AbstractIn this paper, we present the energy-saving potential of using optimized control for centrifugal pump–driven water storages. For this purpose, a Simulink pump-pipe-storage model is used. The equations and transfer function for steady-state and transient system behavior are presented and verified. Two different control strategies—optimum constant flow rate and level guided speed control—are compared to an allegedly optimal-driven pump with constant rotational speed. Twelve centrifugal pumps between 1 and 120 kW nominal power are evaluated to analyze the influence of different system parameters. The system characteristics, which are the static head, dynamic head factor, and maximum filling head, are varied 25 times for each pump in consideration of the pump’s best efficiency point. Thus, 300 different systems are optimized for each control strategy and compared to the constant speed control. The results are analyzed and the relevant system’s parameters, which have the most significant impact on energy savings, are shown. This theoretical energy–saving potential is verified with measurements, which show the high impact of the part load losses of the frequency converter and the electric motor. A law for identifying and estimation potential energy savings is developed using this information. Four use cases are analyzed with this law. It is shown that for a cost-minimal operation, not only the savings potential but also the operating time is decisive.

scholarly journals Reducing energy waste in centrifugal pump systems through the implementation of BEP optimized pressure and flow control

2015 ◽  
Author(s):  
◽  
Shane Corlman
Keyword(s):  
Centrifugal Pump ◽  
Energy Savings ◽  
Control Valve ◽  
Speed Control ◽  
Variable Speed ◽  
Centrifugal Pumps ◽  
Efficiency Curve ◽  
System Variable ◽  
Applicable Range ◽  
Drive And Control

There currently exists a gap in the technology surrounding centrifugal pumps. When looking at modern literature regarding the application of centrifugal pump systems, the existing methods for control are throttle and speed control. Herein is described a new method, one which uses both throttle and speed control simultaneously to allow for the ability to precisely regulate pressure and flow for an entire system. Variable speed pumping, when combined with a control valve allows for control techniques which have the goal of optimizing the efficiency of the pump instead of just controlling flowrate. Developing a variable speed characterization and finding the best efficiency curve of a pump gives all the necessary tools to create a "dual controller" to operate a pump in the region of greatest reliability, always. Experiments show that neither fixed speed operation nor variable speed operation without a control valve can accurately maintain operation at the best efficiency point of the pump. Therefore, a novel control system using both a variable speed pump and a control valve is proposed to replace individual throttle and speed control. The proposed system, when used with the best efficiency curve as the operational target, maintains the best efficiency point for any flow requirement within the applicable range of the pump. Additionally, experiments have shown that energy savings from the proposed control scheme can exceed 60% -- a savings which no fixed speed system can match. Dual control with a variable speed drive and control valve can reduce energy consumption and increase pump life and reliability when compared to throttle control or speed control alone by reducing the amount of time that the pump is operating away from its best efficiency point. Similarly, it provides the tools needed to produce any performance that an operator desires, whatever the application may be.

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