Achieving High Efficiency Pumping with Variable Speed Technology

Achieving High Efficiency Pumping with Variable Speed Technology

By George Taber – Applications Engineer-Technical Services Supervisor, Taco, Inc.   

Most HVAC systems are designed to keep a building cool on the hottest days and warm on the coldest days. This being the case, an HVAC system needs to work at full capacity on only the ten or so hottest and coldest days of the year. For the rest of the year the HVAC system should operate at a reduced capacity to save energy.

This is where a system equipped with variable frequency drives (VFDs) can be used to match system flow to actual heating-cooling demands. Use of VFDs can reduce the motor speed when full flow is not required, thereby reducing the power required and the electrical energy used. For example, at 80 percent nominal flow, power consumption is reduced by some 50 percent when using a VFD.

Energy cost with variable-speed pumping.

Energy cost with variable-speed pumping.

An HVAC system controlled by VFDs will go a long way in helping a new or existing building achieve greater energy efficiency. Not only will HVAC systems supplied by VFDs save money – in many instances, the payback period for installing adjustable frequency drives in place of other flow control methods is less than 12 months – but they will also increase the indoor comfort of the building and reduce equipment maintenance costs and operational downtime. Plus, should the building be LEED certified and meet the requirements of the Energy Policy Act of 2005, additional money saving opportunities are afforded through state and local government incentives.

Ultimately, more efficient HVAC systems create more energy efficient buildings, which in turn conserve energy resources.

As many factors affect the efficiency of a pumping system, the whole system needs to be analyzed, not just the pumps. We would like to hear your feedback about this series of articles about the efficiency of a pumping system, and what other factors do you think are important.  

One Response

  1. Newest technology is particularly helped in the highest part of daily life. Its also make fast and faster than before. Every industry continue to keep an eye on what competitors are doing to help subscribers makes best use of the technology. And many site provide daily technology news updates.

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