At the end of last month’s column (Retrofit variable speed pump considerations, Part 1), I promised that we would venture into the world of sizing retrofit circulators for light commercial projects ...

In hydronic heating and cooling systems, circulator pumps move water or refrigerant throughout a closed-loop system in order to transfer energy from the source to the point of need. While older ...

Variable-speed solar pumps have been added to the 00® family of circulators. The pumps are designed to match solar collector output, a feature that increases solar system performance by 20 percent.

A recent trend in nuclear power plant upgrades has been the replacement of the motor-generator (MG) sets that drive the reactor circulating pumps with variable-frequency drives (VFD). Siemens’ first ...

At the end of last month's column (November, p. 40), I promised that we would look at the bottom line results of retrofitting variable speed pumps on a sample project. As I explained previously, for ...