Assessing the benefits of variable-speed drives

15 July, 2006

Assessing the benefits of variable-speed control for fans and pumps, free software from Siemens Building Technologies.

Free software to calculate how much money could be saved using variable-speed drives with fans and pumps is offered by Siemens Building Services Technologies. The software analyses the return on investment and payback period. SED2 EasySave software also helps meet the requirements of the latest directives and regulations relating to the efficient use of energy in buildings. Users can asses an extensive range of practical factors affecting plant performance. For example, the number of operating hours per day at flow rates from 10 to 100% can be specified, as can energy prices, installation cost of the equipment and the cost of downtime for installation. The results include savings from energy efficiency, reduced plant wear and tear and from reduced harmonic generation. The basis for calculating savings is the existing system. For pumps, this can be specified at throttle or bypass control or full flow. Options for fans are variable inlet vane, outlet damper, 2-speed, bypass and full flow.

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