Norm Hall
/
November 22, 2021
An engineer asked a question about using a variable speed pump for air temperature control in lieu of a two-way control valve. What are the... READ MORE
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An engineer asked a question about using variable speed pumps for air temperature control in lieu of a two-way control valve. The question clearly makes you... READ MORE
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Every year we get questions about the importance of primary-secondary piping rules around boilers and coils. Recently, I also received a call about using a... READ MORE
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The engineer is aware of the importance of minimum flow to the pumps in hydronic systems. The R. L. Deppmann Monday Morning Minutes Part 1... READ MORE
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The HVAC engineer designing a hydronic system understands the need to protect the circulating pumps from a dead head or no flow condition. This week,... READ MORE
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Every week a question comes into R. L. Deppmann about the minimum flow rate through hydronic pumps and the best way to achieve it. Today,... READ MORE
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We recently received an inquiry from an engineering firm deciding whether to change their pump schedule. They currently select the pumps at design capacity and... READ MORE
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A Mobile App for Domestic Hot Water Recirc. & Residential Circulators
Norm Hall
/
July 5, 2021
Someday, there will be a mobile app that can provide a warning when your domestic water and/or residential heating pumps stop working. For smaller gallon... READ MORE
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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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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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