Norm Hall
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June 21, 2021
There are multiple methods to vary pump speed in HVAC chilled water systems. A common method is the use of a differential pressure transmitter at... READ MORE
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Cooling Tower Spring Startup Tips
Norm Hall
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April 19, 2021
The weather is warming, and our attention turns away from heating and toward system air conditioning. To protect the cooling tower pumps, we offer a... READ MORE
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Tis’ the Season to Start Your Air-Cooled Chillers
Norm Hall
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April 12, 2021
Many air-cooled chillers do not have glycol and are drained for the winter season. Most cooling towers are also drained for our cold winter months.... READ MORE
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What’s lurking in your traditional open cooling tower basin? Today, there is a growing concern about the sediment build-up, algae growth, and bacteria growth in... READ MORE
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The last R. L. Deppmann Monday Morning Minutes offered suggestions for the use of a Griswold sediment separator in a variable flow tower system. The... READ MORE
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Gas-fired storage type domestic water heaters are the norm in commercial and institutional buildings. Walk into any mechanical room of a larger complex and you... READ MORE
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Once in a while, we still see the two pipe heating or cooling system with a manual or automatic changeover process that the owner uses... READ MORE
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Sizing Pressure Relief Valves for Closed Chilled Water Systems
Norm Hall
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November 12, 2018
Pressure relief valve sizing for heating systems is well documented by ASHRAE, boiler codes, and product manufacturers such as Bell & Gossett. Relief valve sizing... 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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Today’s building owner’s have many opportunities to improve water use efficiency. ASHRAE Standard 189.1 identifies a few areas to focus on reducing water use specific to cooling towers. The last four issues of Deppmann’s Monday Morning Minutes has discussed specific strategies to improve water use efficiency using current Cooling Tower and Advanced Water Treatment technology advancements in design. [Read more…]... READ MORE
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