Over the last few weeks the Monday Morning Minutes posts have looked at pumping issues with multiple condensers and pumps. One of our most-received questions …
Parallel Pumping with Unequal Condensers (Part 4)
Over the last few weeks our Monday Morning Minutes posts have looked at pumping issues with parallel, equal-sized condensers and pumps. This week we will look …
Parallel Pumping in Condenser Applications: Automatic Differential Pressure Control (Part 3)
Chilled water condensers are normally operated as constant-flow devices and the pumps serving them are constant-speed. Why would you ever use a variable-speed drive for …
Parallel Pumps in Condenser Applications: Limiting the Flow Rate (Part 2)
In part 1 of this series we offered an example condenser water pumping system. The design of this example is 800 GPM per condenser for …
Parallel Pumping in Condenser Applications (Part 1)
Applying a single constant-speed pump for each condenser in a chilled water application is a normal design for the HVAC engineer. The chiller manufacturers suggest …
Bell & Gossett Part Load Efficiency Value (Part 5): BTUH Load Output vs. Percent of Flow Tolerance
The last four segments of the R. L. Deppmann Monday Morning Minutes introduced the valuable PLEV tool from Bell and Gossett. The part load efficiency …
Bell & Gossett Part Load Efficiency Value Part 4: End-of-Curve Selections
When looking at Bell and Gossett pump selections, we often find higher part load efficiency (PLEV) pump choices are to the right of the BEP, or best …
Bell & Gossett Part Load Efficiency Value Part 3: HVAC Pump Selection
In the last two Monday Morning Minutes, we introduced the PLEV, or Part Load Efficiency Value, from Bell and Gossett. When we use part load …
Bell and Gossett Part Load Efficiency Value Part 2: How to use PLEV
In the last Monday Morning Minutes post, we introduced the PLEV, or Part Load Efficiency Value from Bell and Gossett. This week we look at some …
Bell and Gossett Part Load Efficiency Value
The last three Monday Morning Minutes have introduced the U.S. Department of Energy 2020 pump standards. The Standard looks at efficiency of pumps equally at …