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Home > What's New > The benefits of inverter control in air-cooled condensers(2)
  • The benefits of inverter control in air-cooled condensers(2)2009-03-20
  • More good news

    There is even more good news though. Often the fans are rated to operate up to 60 Hz, which, with an appropriately sized inverter, increases fan speed by 20 %. Depending on design, this can reduce discharge pressure by a further 0.5 to 0.75 bar. This also ensures good heat rejection at high ambient temperatures, where some systems will trip due to high discharge pressure - exactly when you need efficient cooling.

    Now we come to the all-important maintenance dividend. On many condensers that have been operating for some time, the motors fitted to the first fans in sequence need constant attention due to the mechanical shock caused by constant cycling to maintain the correct pressure.

    The bearings on the last fans in sequence are often seized, often because they have been idle during the winter. In our experience, it is only on the first ‘hot’ day of spring or summer, when the system trips on high pressure, that this defect is noticed.

    The application of inverter control means that all fans are kept rotating and do not need to cycle to maintain conditions. We encountered these problems when we were surveying process chillers at a large telecomms satellite station. The solution was very well received.

    Often, a visual inspection will show the first section of the condenser is blocked, as a result of the lead fans pulling air through this section at high velocity. The use of an inverter means that low-velocity air passes through the entire condenser face, resulting in less debris blocking the heat exchanger.

    Noise

    In some instances, the noise generated by condensers can prove the bugbear. In a recent case, a food processing company in a rural idyll had, understandably, been receiving complaints from a local homeowner, who claimed that their sleep was being constantly disturbed by the change in pitch due to fan cycling.

    The local authority, under noise abatement rules, insisted that the company take immediate action to overcome the problem. This even came with a recommendation that the condensers be located in a baffled compound to reduce noise. What was not stated in the document was that this measure would also reduce airflow and increase energy consumption.

    The application of an inverter control solved the problem at a stroke and saved the company tens of thousands of pounds needed to build an acoustic enclosure. Above all, it was also an environmentally sound solution.

    For more information ,please visit http://www.bossgoo.com

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