In the last R. L. Deppmann Monday Morning Minutes (MMM), we introduced the basic concept of an HVAC variable speed pump control head, modeling a …
HVAC Variable Speed Pump Control Head
When we show variable speed pump curves, we also want to show the control curve. This control curve looks very similar to a system curve …
Converting Constant Speed Pumps To Variable Speed – End Of Curve Concerns
In the R. L. Deppmann Monday Morning Minute from June 4th we offered some tips on converting an existing over-headed constant speed pumping system to a …
HVAC Centrifugal Pump – Converting Constant Speed To Variable Speed
This week a Michigan engineer contacted me to discuss the conversion of an existing and oversized constant speed secondary chilled water pump to variable speed …
Bell & Gossett ESP-Systemwize Pump Selections: Part 3
Happy Memorial Day! Today we celebrate and remember those brave patriots who sacrificed their lives while serving in the Armed Forces protecting the freedoms all …
Bell & Gossett ESP-Systemwize Pump Selections: Part 2
ESP-Systemwize provides a number of pump selection choices. Which pump should I select? Which pump should I fight for in a competitive bidding environment? Today, …
Bell & Gossett ESP-Systemwize Pump Selections
ESP-Systemwize is a powerful tool provided to the industry by Bell & Gossett. As an engineer or designer, you may want to explore the options …
Pump Selection Criteria: Maximum Point on the Curve
How many times have you, as an engineer, looked at a number of pump curves and passed up a few because you did not like …
HVAC Hydronic Pumps: Impeller Trimming with a Drive (VFD)
In the last R. L. Deppmann Monday Morning Minute we covered the use of a B&G Triple Duty Valve to set the maximum speed in …
HVAC Hydronic Pumps: B&G Triple Duty Valve for Proportional Balance
The ASHRAE Standard 90.1-2013 and the State of Michigan 2015 Energy Code both require the trimming of impellers or reduction in the maximum speed when …