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Category Archive: Energy Efficiency

Dec
14
2017

How do I select induction motors for industrial applications? (Part 3)

Design Considerations (cont.) Different Rotor Classes// The different rotor class, i.e. KL7, KL10, KL13, KL16, KLp, etc. are available in case of the motor to fulfil the functional torque requirements of the driven equipment. The rotor classes indicate against what quantum of the load torque the motor would be able to start easily. The motor …

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Dec
04
2017

How do I select induction motors for industrial applications? (Part 2)

Design Considerations (cont.) Motor Efficiency// The new IEC 60034-30 motor efficiency standard could have major energy-saving impact for industrial motors worldwide. Though standard motors are now available with a better efficiency, this factor (motor efficency) requires due attention when making the selection of the motor for a specific application in view of substantial quantum of …

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Nov
09
2017

What is the principle of power factor correction and protection of capacitors?

Power factor correction principle// Loads such as induction motors draw significant reactive power from the supply system, and a poor overall power factor may result. The flow of reactive power increases the voltage-drops through series reactances such as transformers and reactors, it uses up some of the current carrying capacity of power system plant and …

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Jun
22
2017

What are the most common flow control methods of pumps?

Pump as a part of the process // When in use, the pumps are always part of a pumping system. A pumping system is usually a network of pipes, tanks, valves and other system parts. The receiver is usually at a higher geographic level than the supply of the system. These parts can be also …

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Apr
13
2017

How do capacitors improve the power factor and how do I calculate them?

How to improve the power factor? It’s quite simple. By installing capacitors or capacitor banks. Improving the power factor of an electrical installation consists of giving it the means to “produce” a certain proportion of the reactive energy it consumes itself. There are various different systems for producing reactive energy, including in particular asynchronous compensators …

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Mar
02
2017

How do standby generators work and how do I dimension them?

Standby generators// Standby generators (Figure 1 below) are used in order to provide consumers in the system entitled to standby service in the event of breakdown or shutdown of the normal power supply. They consist of the generator, the flywheel and the motor. For the dimensioning of the generator power to supply a large number …

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Feb
16
2017

Why do we care so much about power factor correction?

Power factor improvement // Power factor, as every electrical engineer should know, is defined as the ratio of real power to volt-amperes and is the cosine of the phase angle between the voltage and current in an AC circuit. These are neatly defined quantities with sinusoidal voltages and currents. Power factor can be improved by adding capacitors …

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Jan
24
2017

Why must you use variable speed drives in pumping applications?

Variable speed drives in pumping applications // Pumping applications represent a significant opportunity for applying variable speed drives (VSDs) in new, as well as retrofit installations. The majority of pumping applications need to be controlled. It is unlikely that a pump will run continuously at a maximum speed. Variable speed drives are crucial when limiting the …

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Dec
12
2016

8 actions to improve energy efficiency in heating systems

Energy efficiency of heating systems // In many buildings, HVAC is the first or second item in terms of energy costs. This technical article deals with optimisation tips and energy efficiency savings in heating systems of a building. Heating systems in building Heating systems have always been used when the outside temperature drops below a …

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