Energy efficiency – the specifics

Convincing calculation examples from the widest range of sectors

Hoisting drive

Calculation example, energy recovery

Hoisting drive in a high-bay racking system

Valuable energy is lost when ever a braking resistor is used. For instance, this becomes quite clear when investigating a hoisting drive for high-bay racking units. The comparison between a standard converter and a converter with Efficient Infeed Technology - which feeds the braking energy back into the line supply - speaks for itself.

Result

Energy costs reduced by: 52 %

Space saving: 77 %

Calculation example for hoisting drives
Comparison, standard converter / converter with Efficient Infeed. Example: Hoisting drive of a high-bay racking unit

Pumps

For cost reasons, the delivery rate of a large water fountain, which is operated with a 900 kW pump, is to be optimized depending on the time of day. The pump delivery rate should be 100 % when a lot of people are around, 60% in the morning and evenings – and only 30 % during the night. The SinaSave energy saving program calculates in advance the saving when a frequency converter is used to control the pump delivery rate.

Result

Energy costs reduced by: 58 %

Return on investment: 490 %

Payback time: 3 months

Comparison, throttle control versus converter, generated with SinaSave®
Comparison, throttle control versus converter, generated with SinaSave®. Energy cost saving using a pump as an example

Energy cost saving using a pump as an example
It involves a pump for a water fountain, which depending on the time of day, is operated with the full delivery rate or a delivery rate reduced in stages. Summary: Dependent on the time of day

Fan

For an air conditioning system in an office building, the SinaSave energy-saving program calculates the potential saving when closed-loop speed control with a frequency converter is used. This should be used to drive the fan, which keeps the room temperature at the desired setpoint, as well as also the fans which are used to maintain a constant air pressure in the offices.

Result

Energy costs reduced by: 68 %

Return on investment: 215 %

Payback time: 6 months

Comparison, throttle control versus converter, generated with SinaSave®
Comparison, throttle control versus converter, generated with SinaSave®. Energy cost saving using a fan as an example

Energy cost saving using a fan as an example
This involves the fan in an air conditioning system that is suitable for the maximum temperature that occurs. However, on the average, in Central Europe, this only occurs infrequently in any year. The flow rate of a typical fan first starts at approx. 30%. Summary: Temperature-dependent

Compressor

In a wastewater treatment plant, three radial compressors – each with a rating of 55 kW - blow air into so-called activation basins. This process removes organic dirt particles and ammonium from the pre-treated water. The SinaSave energy-saving program determines the cost saving when a frequency converter is used to control the speed of the compressors compared to the previous uncontrolled operation.

Result

Energy costs reduced by: 82 %

Return on investment: 658 %

Payback time: 2 months

Comparison between control using a frequency converter and throttle control, generated using SinaSave® 3.0
Comparison between control using a frequency converter and throttle control, generated using SinaSave® 3.0. Energy cost saving using a compressor as an example

Energy cost saving using a compressor as an example
Values measured in a water treatment plant. The flow rate depends on the overflow from rain water and what is pumped into the water treatment plant from private households. Summary: Usage-dependent