Norm Hall
/
January 23, 2023
We understand that the best way to determine the flow rate of an operating pump is the proper readout of gauges attached to the pump... READ MORE
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This week, the R. L. Deppmann Monday Morning Minutes will explain how to show multiple speeds on a pump curve and how to determine what... READ MORE
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When there is no hydronic pump discharge balance valve, the variable frequency drive (VFD) is an important part of the balance procedure. How does the... READ MORE
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Most centrifugal pumps in heating and cooling systems have some oversizing in the head calculation. Once the HVAC hydronic system is proportionally balanced per ASHRAE... READ MORE
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Open cooling tower pumps are traditionally operated as constant speed. When balanced, the extra pump head or over-heading is throttled across the discharge balance valve... READ MORE
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The HVAC hydronic system is proportionally balanced per ASHRAE 90.1 energy standards. The proportional balance, when properly completed, will result in all the extra pump... READ MORE
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ASHRAE Energy Standard 90.1 indicates the hydronic system shall have proportional balance and the pump over-heading shall be removed through speed reduction or impeller trimming.... READ MORE
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In the last R. L. Deppmann Monday Morning Minutes I defined the difference between flat curves and steep curves in a hydronic pump selection. I... READ MORE
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Glycol correction factors were the subject of many of the last few R. L. Deppmann Monday Morning Minutes. While writing these articles, I thought about... READ MORE
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Ask any test/balance or service technician in the hydronic HVAC world to convert PSIG to feet of head and the multiplier of 2.31 is the... READ MORE
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