This column features helpful information, innovative equipment, systems and applications utilities around the nation can use to save energy and improve service.

New heat pump technology won’t freeze up in the cold
by Craig Meredith, P.E.

As the name implies, cold climate heat pumps are optimized for use in cold weather areas. This technology borrows from commercial refrigeration systems to maximize efficiency. The systems are capable of operating efficiently at outside temperatures far lower than standard heat pumps, and with a SEER rating of 16, are almost as efficient as the geothermal variety.

The difference comes from a combination of technologies blended together to enhance performance. First, they use zero-ozone-depleting R-410, a refrigerant that is more efficient than R-22 and has a higher heat transfer rate. The compressor has two cylinders, two stages of compression, and a two-speed motor. This allows the system to run under a variety of conditions to optimize performance for the conditions.

An additional backup booster compressor operates when the outside conditions are between 15 and 35 degrees F. An economizer is then added to allow it to work below 15 degrees F.

Finally, an intelligent control system senses the outside and inside temperature to determine the best operation mode for peak efficiencies. All of this comes together to make a high-efficiency heat pump for cold climates.

For further information about this technology, contact the Power Line at 1-800-POWERLN (1-800-769-3756) or submit your question online.