Variable speed pumps have been around for years. As I mentioned in last month’s article, I used the technology at my own home at the turn of the century. A control varied the speed of a pump in an ...

Abstract: The constant pressure variable pumps are useful in hydraulic systems of aircraft and machines. The variable pump pressures can bring the advantage of energy saving in the hydraulic system. A ...

Cavitation in pumps must be detected and prevented. The present work is an attempt to use the simultaneous measurements of vibration and sound for variable speed pump to detect cavitation. It is an ...

The Evolution® Extreme variable-speed heat pump (280ANV) has efficiencies of up to 13 HSPF and up to 20.5 SEER. When combined with an Evolution control and Evolution gas furnace or fan coil, the heat ...