When looking at pumps, the one question every HVAC and Plumbing engineer will ponder is “which pump do I choose?” There are several factors that …
Basic Centrifugal Pump Selection: Which Pump Do I Choose? (Part 1 of 2)
When looking at pumps, the one question every HVAC and Plumbing engineer will ponder is “which pump do I choose?” There are several factors that …
Variable Speed Pump Control: Wheels and Ladders and Diversity
Commercial and industrial hydronic heating and cooling systems will usually have variable speed distribution pumps. There are multiple ways to identify what speed the pumps …
Variable Speed Systems: Types of Sensors (Part 2)
Last week, in part one of this series, we looked at temperature, pressure, and differential pressure sensors to control the speed of a HVAC or …
Variable Speed Systems: Types of Sensors (Part 1)
The variable frequency drive can vary the speed of the centrifugal pump from zero to speeds over the nameplate of the motor. Of course, the …
Control Head: Quiz Answers and a Thought on Variable Speed Pump Selection
In the last R. L. Deppmann Monday Morning Minutes (MMM), What is Control Head in Hydronic Variable Speed Pumping?, we mentioned a quiz and asked …
What is Control Head in Hydronic Variable Speed Pumping?
Control head is a term used in many different industries. What is the control head in our world of variable speed pumping hydronic and plumbing …
Variable Speed Pump Motors and Drives
Danfoss VFD Motor Efficiency Terms Bell & Gossett ECM Pump Variable speed centrifugal pumps in building heating, cooling, and plumbing systems use a …
Developing Variable Speed Pump Curves
Most heating and cooling pumps in commercial buildings operate in a variable speed mode. Today, we take your Monday Morning Minutes to explore the variable …
Three-way and Two-way Control Valve Basics in Hydronic Systems
Centrifugal pumps operate at the intersection of the pump curve and the system curve. Last week we developed the system curve for an example closed …