Norm Hall
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August 30, 2020
When using multiple parallel condensers with constant speed pumps, the flow rate at part load may be excessive and problematic. Our last blog on this... READ MORE
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The design and flow balance in systems with multiple parallel condensers is straight forward. We should expect no issues at full capacity. What happens when... READ MORE
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It is important to check the single pump operation when balancing parallel pumps for multiple constant speed cooling tower pumps. The condensers and pumps are... READ MORE
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It is important to check the single pump operation when selecting parallel pumps for multiple constant speed cooling tower pumps. In the last R. L.... READ MORE
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The blistering hot weather here in southeast Michigan caused me to turn my attention to cooling tower pumps and their control. Cooling tower pump control... READ MORE
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Parallel Pumping: 2-Position Control Valves on Multiple Cooling Towers (Part 5)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 29, 2016
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... READ MORE
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Parallel Pumping with Unequal Condensers (Part 4)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 22, 2016
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... READ MORE
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Parallel Pumping in Condenser Applications: Automatic Differential Pressure Control (Part 3)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 15, 2016
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... READ MORE
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Parallel Pumps in Condenser Applications: Limiting the Flow Rate (Part 2)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 8, 2016
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... READ MORE
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Parallel Pumping in Condenser Applications (Part 1)
Norm Hall, R.L. Deppmann and Chad Edmondson, J. M. Pleasants
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August 1, 2016
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... READ MORE
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