scholarly journals Using Variable Speed Control on Pump Application

2012 ◽  
Vol 2 (1) ◽  
pp. 251
Author(s):  
Dr.Sc. Aida Spahiu ◽  
Dr.Sc. Orion Zavalani ◽  
MSc. Altin Uka
Keyword(s):  
Energy Efficiency ◽  
Energy Savings ◽  
Speed Control ◽  
Reference Points ◽  
The European Union ◽  
Variable Speed ◽  
Centrifugal Pumps ◽  
Variable Speed Drive ◽  
Carbon Dioxide Co2 ◽  
Variable Speed Control

Pumps are one of the most common variable speed drive (VSD) system applications and special interest has focused on improving their energy efficiency by using variable speed control instead of throttling or other less efficient flow control methods. Pumps are the single largest user of electricity in industry in the European Union, consuming 160 TWh per annum of electricity and accounting for 79 million tonnes of carbon dioxide (CO2) emissions [1]. Centrifugal pumps are the most likely pump style to provide a favorable return based on energy savings when applied with a variable speed drive. To help illustrate this, are conducted benchmark testing to document various head and flow scenarios and their corresponding effect on energy savings. Paper shows the relationship of static and friction head in the energy efficiency equation and the effect of motor, pump and VSD efficiencies. The received results are good reference points for engineers and managers of water sector in Albania to select the best prospects for maximizing efficiency and energy savings.

Mathematical modelling of supermarket refrigeration systems for design, energy prediction and control

2000 ◽  
Vol 214 (2) ◽  
pp. 101-114 ◽  
Author(s):  
Y T Ge ◽  
S A Tassou
Keyword(s):  
Energy Savings ◽  
Control Strategies ◽  
Speed Control ◽  
Variable Speed ◽  
Ambient Conditions ◽  
Energy Prediction ◽  
Head Pressure ◽  
Component Models ◽  
And Control ◽  
Variable Speed Control

This paper describes a mathematical model developed to simulate the performance of supermarket refrigeration systems. Such a model can be used for the comparison of different systems and control strategies in terms of their energy and total equivalent warming impact. The model is based on a large number of component models which have been linked together within the TRNSYS environment. Major component models include the compressor, air-cooled condenser, thermostatic expansion valve, display cabinet and control. The overall system model has been validated against monitored data obtained from both a laboratory-based system and a full-scale system in a supermarket in Scotland. The value of the model is illustrated by determining and comparing the effectiveness of head pressure and variable-speed control against fixed head pressure and constant speed control. It is shown that even at summer ambient conditions the system can be operated without problems at much lower head pressures than is done in practice under fixed-pressure control strategies. The use of variable-speed control on one of the compressors can also provide better control of the suction pressure and a substantial (up to 23 per cent) energy savings compared to on-off control.

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.

Neuroadaptive Variable Speed Control of Wind Turbine With Wind Speed Estimation

2016 ◽  
Vol 63 (12) ◽  
pp. 7754-7764 ◽  
Author(s):  
Dan-Yong Li ◽  
Wen-Chuan Cai ◽  
Peng Li ◽  
Zi-Jun Jia ◽  
Hou-Jin Chen ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Speed Control ◽  
Speed Estimation ◽  
Variable Speed ◽  
Variable Speed Control
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